The Rear Main Seal Is A Little Harder Than Most To Replace But Once You Change It, Your Gargare & Driveway Will Be Clean Of Leaking Oil Once Again. a mechanic friend said it was a known issue. I think it would be wise to do upper and lower seals, or just wait on it, save some cash and pull the engine to clean up and put new gaskets on everything, with a new chain, all at once. com: Car complaints, car problems and defect information. Make sure that the seal on the oil fill cap is in good shape as well. If you believe the oil to be the problem, remove the synthetic, save it, and replace with organic. try to use it on a fresh oil change and leave it in for 6-8000km then rinse and repeat at most one more time. The only way to fix a rear main seal is to remove the transmission, pull out the old seal with a seal puller, and install a new one. You can also try using thicker weight engine oil, like 50 weight. I don't have any way to get the transmission out of the way or the tool to install the seal so I decided to farm this work out. using heavier oil won,t stop it. But the rear main seal hs been leaky, not much but still Its a big job to change it so I have left it til it was open. If the seal is damaged or the shaft surface is. But then you need to drop the oil pan as well. I'm not sure if these tend to progress into the water jackets or cylinder. One tool that some people have had success with is an oil additive called Blue Devil Rear Main Sealer. I've read on this forum not to worry too much about a rear main seal weep or small leak until it becomes a real leak. If the leak comes back, I'm going with 15w40 which is approved for outside temps of 0 degrees F and higher. Luckily a buddy of mine is a pro and has a lift and we pulled it all and resealed everything. Leak Repair Rear Main Seals. About a month ago, I put a Felpro teflon seal in the car. Title says it all, is there a way to tell a rear main seal leak from an oil pan gasket leak. I even get great fuel economy. I would try a 10W-40 oil. I think it would be wise to do upper and lower seals, or just wait on it, save some cash and pull the engine to clean up and put new gaskets on everything, with a new chain, all at once. My question is should I replace the bearings and stuff or just replace the seal and fill rear with fresh oil?. then rear main cap removal of the seal is not hard but tedious and one must be careful not to scratch the crank. I know that isn't what you want to hear, but that is the simple truth. The new seal should be set flush with the block and bearing cap, and no deeper. well check this out If you are having a rear main seal leak read this guys thread he lays it out. This type seal is included in all major manufacturers engine overhaul gasket kits currently available. Replace the crankshaft rear main oil seal with the new design (P/N 12592195) using the new installation tool (EN-48108) and the following service procedures. On the contrary, it works quite well on rear main seals. The 2004 Chevrolet Aveo has 2 problems reported for rear main seal broken, leaking oil. a local napa shop diagnosed a rear main seal on mine as well. Oil Leak d16y7, Replaced rear main seal. I live I western Washington State and it rarely gets cold here. An oil leak is hard to trace to its exact cause because a little bit of oil, when blown back towards the exhaust when driving, can look like a lot of oil from somewhere else. They usually pop out due to crank case pressure, so either improve your crank case breathing, or find the cause of the pressure - likely to be ring/liner wear. That's one of the hardest leaks to fix and we'll deal with how to do it, but many leaks appear to be from the rear main seal and actually aren't. I am willing to replace the rear main seal if I need to. 010" protrude on all four corners. Im told the engine needs to be pulled to get to the rear main seal. This seal is more difficult to replace however because the transmission will need to be removed before the rear main seal can be replaced. I didn't overly pack in the seal,just followed the Mfg's direction sheet. Usually with 181,000 miles, it’s low risk. The common Subaru oil leak problem areas are: Rear of engine, PCV baffle plate; Front of engine, crank seal and piston access plugs; Valve cover/spark plug tube seals ; Well, of course there are other areas that leak oil but, as of my years of experience working on Subaru’s I would have to say these are the most common oil leak areas. Discuss 07 Honda CRV with Rear Main Seal Leak in the rec. One has a thick end seal for one type of oil pan, the other has a thinner end seal. The TSI engine is known to have PCV valve failures, which will cause an excess. The trick to the whole thing and to getting the best results is to make sure you have the ends of the two halves offset from the joint where the main bearing cap meets the block. To install the new rear main seal you want to take your time with this. We’re glad you asked. Just had my car into the garage and I have a leak in the rear main seal. Dealer rep told me NOT to drive it home to wait for the parts to come in as I might experience other problems. Park it overnight and there are oil stains under it, one at passenger side and one at driver's side. > Important to be sure to seal any place that oil could get out. , Seeing it is a 1 piece seal I do not have time to pull the trans til spring to replace that seal. Hello everyone - need some advice here if you can - the 2001 4runner 3. As far as the oil leak, are you confident it's the rear main seal? If it is, most shops carry a 12 month, 12000 mile warranty on repairs. Finally, the rear main is one of the LAST places that fail or leak on 7. But its been my experience that most of the oilleaks out that jingle-jangle weep hole is usually the TRANNY front oil seal ($3 cheap) that should be routinely replaced whenever the tractor is split. A rear main oil seal will cause a leak, resulting in the vehicle being unroadworthy. It made a lip where oil would pool and leak. On the last oil change at 155k, "10w30 high mileage with seal" oil was used. I suggest frequent oil changes so the oil remains thicker. Their part number for a rear main seal for a 57-58 392 is P/N 3A07. Unfortunately, I have what appears to be a rear main seal leak on my '83 R100RS. This increases the engine compression adding more stress to engine oil seals & gaskets. Can those be replaced without pulling the engine? Tranny's gotta come out to replace the rear main seal, IIRC. Just tell them that you have a leaking rear main oil seal. Check the tension on your oil pressure sender wire where it slides onto the sender if your level is correct. Told me to bring it back when I see it leaking again. Is there ANY way I can fix a rear main seal leak without replacing the seal? The car is old and not worth the cost for a proper fix. The oil leak is coming from the bottom of the gearbox near to the engine oil drain plug. Looking at the car's underside, I don't see any oil leaks. Get product details, choose a store, and get directions. Drive the new seal in the rear cover. I know that Lucas is pretty popular, but I wasn't sure if there was another more reliable brand. I'd check your sump bolts first. Again, there is no leak at idle when hot or cold. Try the sump gasket, try the oil pressure switch and the rear main seal you mentioned. Procedure 1. Unfortunately for me, I bought a Nissan Pathfinder that is notorious for the RMS leaking after say 140k miles or so. 00, and you don't even have to change your oil!. 4l and it is driving me nuts I have to add two quarts of oil every week looks. Advance has two that I was looking at. Whether you have an 88 XJ or a 2002 TJ, this problem plagues Jeeps young and old. Has anyone every seen this happen before or would know what might have caused this? The car has 180K on it and I didn't overfill when I did the oil change. 2 weeks later it's already leaking. Rear main seals dont leak on these motors, there is a cover plate that goes on in the same place behing the bellhousing on the motor that might leak, you cant tell until the trans is out though. First off, determine if he's talking about the rear main seal (in front of the clutch drive gear), or rather from the rear output shaft seal in the transmission. The rear main seal is leaking but it will be a while before I can fix it. I havea few questions. If it is really leaking more oil now, I have a theory. In May of 2010, I paid a guy to change the rear main seal, as the local Nissan dealer's service department told me such was the cause of an oil leak at the time. When I checked the oil it was a quart low after 1500 miles. Get product details, choose a store, and get directions. Job Hours Takes about 2-6 hours. Took my Pop in a few weeks ago for the first oil change. Fel-Pro (and others) who make the molded one-piece pan gasket have two part numbers - one with the "thin" front seal, and one with the "thick" front seal. chime in with your ideas. Re: Tundra problems (ream main seal) My 2004 Tundra Double cab had a rear main seal leak right from the start. That groove was made for a rope seal, so I don't believe that accuracy was a big concern. 0 rear main seal leaking? We've all experienced the "joys" of owning a Jeep. The thicker oil can fill in the gap between the seal and the crankshaft, and could slow the leak down. I very much doubt I'm the first person to experience this but I'm feeling somewhat distressed at the moment as this afternoon was the first time I started the 90 after replacing the rear main oil seal and it didn't take long before there was a pool of engine oil underneath it (few minutes) , say 5cm diameter. The rear main seal on the TSI engine may sometimes fail. What do you think the possibility is oil would leak from the head gasket down the block BUT no oil in my water and the truck runs fine. Marys NSW Talks About Liquid Intelligence 230 Stop Oil leak Seal Expander. EN-48108 Rear Main Oil Seal Installation Tool This tool has a unique design to allow the technician to easily install the rear main seal squarely to the correct depth and direction. we have already replace the new chrome timing cover and seal ,now have stock cover and the oil keeps coming! new seal ,cover and it keeps a leakin. Firstly there is no such thing as a main oil seal or rear main oil seal. 14 Rear Main Crankshaft Seal for 93-98 Jeep Grand Cherokee ZJ with 5. Infact, most of them had leaks other places. someone at a gm dealer told me the oil filter adapter can leak and if it leaks it can leak back in to the flywheel cover and apear to be a rear main seal. Chances are that it is a rear main seal. I am getting a good deal of oil dripping from the bell housing. (It is definitely oil and not tranny fluid or PS fluid or coolant. rear main leak. Out of all the B-body's I have had, not one of them screamed "Bad rear main seal", to me. First make sure it is engine oil and not transmission fluid. Probably 4-5 hrs labour,the going labour rate at work is $65-70 per hour. BlueDevil rear main sealer update video Also go up on the weight of the oil older motors have more clearance so thicker oil will help slow a leak down. Until yesterday, I have ran the tractor only about 6 or 8 times for no longer than about 30 minutes at a time. Running slightly thicker oil has also helped slow down a rear main leak with my '87 740T after cleaning the PCV system. This leaking oil migrates down along the oil pump housing and drips down at the exact location where oil will drip from a leaking rear main seal. Oil is blowing back from the oil pan, to the bottom of the flywheel, onto the exhaust, and onto the transmission. Stopping Jeep Oil Leaks - Oil Embargo. 99% of the time if theres oil on your rear wheel, its coming from the clutch. I am going to pull the engine to try and find the leak but any wisdom from the Locosters would be greatly appreciated as it has been a long time since I played with these engines in a Sprite and two Minis. Nor is it bad enough to make the level drop on the dip stick (which I check weekly after discovering this). This new design has a channel to lube the area and allows for the rear main seal and bearing to share the same friction area of the crankshaft to reduce vibration on the seal and thus reducing the risk for oil leak. I didn't think those 1 piece seals are leak prone. My mechanic claimed warranty for a whole new pump. Brought it back two days later, they spotted the oil leak with the UV light, and diagnosed it as the rear main seal going bad. Suitable for use in all petrol, LPG and diesel engines. MAIN BEARING CAPS AND REAR MAIN SEAL DESIGN Five main bearing caps are utilized in this redesign. Only 2% of customers require a second treatment to achieve a "Full-Seal". It may get worse before it gets better. I do have some experience turning a wrench, and prefer to do the work if I can, but the rear main seal looks like a job for the professionals. Though as mentioned in another post, it could be coming from the oil pressure sensor. all the seals and gaskets suck. So far we have warranty replaced oil pan gasket, upper oil pan gasket, oil filter gasket and finally just did the rear main seal. Had it replaced 2 times with no change. Chances are that it is a rear main seal. Tap it in a circle slightly and put it flush with the block. The only other possible leak points would be from a failure to tighten and/or seal the threaded rear oil gallery plugs near the camshaft or the large freeze plug that seals the rear of. It will help in sealing. measure to seal any unit up to 8 quart capacity. oil dripping sown from the valve cover gasket running down the block and along pan rail to back of motor on to the. The shim on the right side has been cut / trimmed in order to provide clearance for the one piece rear main oil seal. sleeve I have a 97 S-10 2. Try tightening the two rear-most oil pan bolts, I had a leak there once that looked like a rear main leak. In the case of a vehicle with a manual transmission, a faulty or worn seal can allow oil to leak onto the clutch, causing slipping and chattering. After I put around 2,000 miles on it, (the oil had been changed right before I bought it) I decided to change all the fluids, including the engine oil. I hope you find the leak. Finally removing and replacing the oil pump, the rear main bearing cap and the seal itself were the least time-consuming operations. I like to let the sealant on the seal holder ''set-up'' with the holder in place for a day before inserting the rope. A "rope" rear main bearing seal became standard on both cars and trucks from 1940 onward throughout the 216 era. It now has an oil leak again, and the same service department said the rear main seal is leaking again. Not to mention, it works with ALL gasoline and diesel engines using conventional, high mileage and synthetic oil. Motor maounts will have to be loose and engine raised approx. ls1 is common for leaks since you fixed the rear main leak there is prob more crank case pressure now cos its not leaking out the back of the motor so it has found the next weakest point i think the sump gasket is an engine out job so it may be worth getting a vrs kit and do all/most of the seals. Check the tension on your oil pressure sender wire where it slides onto the sender if your level is correct. You can use the old rear main seal to tap against it to put the seal in the housing. Use a screwdriver to gently pry the pan loose from the engine block if it sticks; which it should if RTV was used. Bar's Leaks Concentrated Rear Main Seal Repair restores the seal to like-new condition, and also contains additives to stop leaks in severely worn seals and crankshafts. Upper right bolt on rear cover, only could see it with the oil pump working. I haven't noticed any oil leaks and I will go to another dealership see if they say anything next time. How To Fix a Rear Main Seal and Oil. If they tell you its the rear main theyre lying. Just had some clutch work done on it, so the shop also replaced the seal. In rear-wheel-drive vehicles, the most common transmission fluid leak is the output shaft seal where the drive shaft connects to the transmission. It seems that I have a leak on my rear main seal. Prior to having this done, I cleaned everything up underneath and the rear main appeared to be the culprit. My dizzy was leaking internally and I changed it out along with a new o-ring. I kinda doubt it's the rear-main seal as well. Up to about 1500 mi. Yes the tranny has to be either removed or slid back, if that is possible on your setup. Marys NSW Talks About Liquid Intelligence 230 Stop Oil leak Seal Expander. first i thoght it was the pan but the i saw a picture of someone elses rear main seal and thoght that was it but when it leaks and im driving. so you might have to change things more often as they keep wearing out. You'll kick yourself in the ass if you drop the tranny and the rear main seal is dry as a bone. Fel-Pro (and others) who make the molded one-piece pan gasket have two part numbers - one with the "thin" front seal, and one with the "thick" front seal. Don't be confused by thick gear oil from your transmission. This is another common leak path for the small-block. I would try a 10W-40 oil. Whatever oil you choose, just make sure it is designed for gasoline engines, not exclusively for diesel engines. Is this a rear main seal or rear oil pan gasket that is causing the leak?. 2L | Quadratec. I'm sick over this and hope my car doesn't get butchered in this Nissan dealership (one dealer Maui Hi). I have now replaced the rear main seal a second time after 215,000 miles and a slight leak after the engine warms up. I used to do all my own maintenance and repairs but no longer have the time, place or equipment to do so any longer and need to take it to a shop. com/user/Bonfield2002 AC DELCO F. Before installing the main cap, paint a small track of sealant on the flat surface from the crank seal to the pan seal (Permatex aviation gasket. I only want to do this once, if. Fixing the leaking seal entails dropping the exhaust, oil pan, main bearing support bar, and rear main bearing, and then replacing the two-piece seal. Install the rear main seal EVENLY. This time the same place used 5W30 synthetic. OMIX-ADA 17458. Noticed it today, right after I added some oil, dont know how much it leaks or anything, just trying to figure out which it is. If so what brands seem to work the. 4"- 6" to get oil pan to clear the engine and crossmember. These included my car, with km ranges from 130,000 to 260,000. Small oil accumulated between motor and trans. If it's the 4 cylinder there is a Allen head oil passage plug on the back of the block near the rear main seal. Rislone Rear Main Seal Repair is one of the only products of its kind on the market specifically designed to solve rear seal oil leaking problems. I don't know why the leak just became noticeable, but I can't see where else it could be coming from. Re: 429 rear main seal leaks. I'm like you - I hate oil leaks. It’s one of those jobs that shops we work with typically charge at least a few hundred bucks. On the drivers side in the back the is a small two bolt cover that can Leak. 2) What is the best way to fix it. a mechanic friend said it was a known issue. If your oil leak is caused by this gasket, you are a lucky individual. Causes of Oil Leaks in XPAG-XPEG engine by Dave DuBois. Just for the hell of it, I replaced the oil pressure sensor as well. From my poking aroung on the discussion boards I found out many owners with this do not fix it as they seem to know it's difficult to eliminate (some say a poor design). When I had a leaking rear seal I kept the oil level just a bit lower (not too low) and that helped. First make sure it is engine oil and not transmission fluid. Motor Oil and Transmission Fluid; Engine Additive and Cleaner; Bar's Leaks Concentrated Rear Main Seal Repair 16. That's why it's so expensive from a labor perspective to get to and replace a $20 part. I HAVE A 2012 RS LTZ i have a leaking rear main seal. I know it's a lot of work, so the price is justifiable, but considering I have a '95 with 142,000 miles on it, would it be worth that $600 to replace it, or should I just carry oil around with me until I get a new car?. If it is leaking it can run right down the back of the engine and make you think it's coming from the rear main seal area. Well as some of you may know i got a leaking rear main seal. This oil pan leak is on my to do list. Unfortunately, I have what appears to be a rear main seal leak on my '83 R100RS. 2L | Quadratec. Bar's Leaks Professional Main Seal Motor Oil Leak Repair is a commercial-grade solution to solve your vehicle's oil leaks. 2L Ecotec Four may produce a leak from the rear portion of the engine. I am replacing the valve cover and oil pan gaskets but the rear main seal is also leaking. Bar's Leaks Concentrated Rear Main Seal Repair restores the seal to like-new condition, and also contains additives to stop leaks in severely worn seals and crankshafts. may be faced with replacing your rear main seal. I changed the oil and the next day the rear main seal is leaking big time. Is there ANY way I can fix a rear main seal leak without replacing the seal? The car is old and not worth the cost for a proper fix. I have 98k miles, I've previously refused their attempt to sell me timing belt water pump service. I doubt it is your rear crank seal and I am not so certain your pan, pan gasket, or drain plug is at fault. Installs just like an ordinary rope seal. Like maybe 1/2 quart a year. WipLash R/T 2/29/2004 15:08:20. A couple of the pieces are fairly substantial - the biggest one is around 20mm Long and 5mm thick. I also think it's a leak on the rear wheel oil seal. You didn't mention if your car is a manual or an automatic. 14 Rear Main Crankshaft Seal for 93-98 Jeep Grand Cherokee ZJ with 5. I'm not sure if the 2. Installation: 1. The shim on the right side has been cut / trimmed in order to provide clearance for the one piece rear main oil seal. > Important to be sure to seal any place that oil could get out. It has been determined that 90% of all rear main seal oil leak complaints checked in the last five years are leaks in the pan gasket, rocker covers, side covers, etc. I'm like you - I hate oil leaks. Again, on most engines this is the rear main bearing cap. Make sure the ends are not parallel with the main cap mating surface (offset the seal about 1/4" from the main bearing cap surface), dab a little blue silicone on each end, and assemble. Do not touch the sealing lip of the rear main oil seal once the protection sleeve is removed. I have a manual transmission with roughly 105,000 miles and my rear main seal was still dry. The labor should cost around $700,. It will help in sealing. Car Craft expert Rocky Rotella shows you how to replace a leaky rear oil seal on an LS1 in a 1999 Trans Am. a mechanic friend said it was a known issue. Anyone replaced the rear main seal on a D600 kubota? I have a 1512 and it is starting to leak oil around what seems to be the rear main seal. The engine run for about 10 min and than it started to leak. I know this is typical, but with the cost of this car, I'm not very pleased with the symptom. This is an OIL PAN GASKET SET for a Lincoln SA-200 & SA-250 with a Continental F163 or F162 motor. Remove furthest back bearing cap : 3. The tractor runs fine but i noticed an oil leak coming in front of the weep hole theres not much coming from the weep hole as the cotter pin is free. Silicone all four corners of the front and rear seals, (the round parts of the oil pan). The fel pro blue 1pc oil pan gaskets have been causing a lot of problems for engine builders. This seal incorporates features that improve high mileage durability. Oil Leaks, MGB 3-main Engine I realize that oil leaks are common on MGs, but my 3-main engine leaks are excessive and come from three areas; the rear main bearing, the oil pan gasket and from the oil filter where the rubber seal on the filter mates with the sealing surface on the oil filter spin-on adapter (not he adapter to engine block interface). I had a rear oil leak as well about three monthes ago and it was the oil pressure sensor and rear main seal. I changed the oil and the next day the rear main seal is leaking big time. One tool that some people have had success with is an oil additive called Blue Devil Rear Main Sealer. I've changed the cam cover seal and also the front cam shaft seal and rear cam shaft oil seal and it's still leaking from underneath. If the leak is severe, I'd look there first. This product comes in a clear, easy to pour 16 ounce bottle. It might even be more involved than that, if I remember correctly the seal is in two parts and that would be a lot more work to insatl. The seal is in two halves - the upper in the block and the lower in the rear main bearing cap. The Repair… First, let's see one of the tell tale signs of a leaking output shaft seal. Slight problem with water leaking into the oil but got that fixed with some decent head gaskets. Any tips on diagnosing it?. The dealer put dye in the engine oil today to try and track where the oil is leaking from via blacklight. REAR MAIN SEAL LEAKING FIXED WITH ATP AT 205 RE SEAL, HOW TO FIX A REAR MAIN SEAL LEAK STEVE ROB CHANNEL https://www. I have read that using a high mileage oil or a thicker oil may help with oil leaks. Crawl under the car and check the oil pan seals. The 2004 Chevrolet Aveo has 2 problems reported for rear main seal broken, leaking oil. Depending on the severity of the damage, this seal could really cause a headache and cost a pretty penny if not replaced right away. There is oil coming out of a hole in the bottom of the bell housing, which would indicate the rear main seal is leaking. First off, determine if he's talking about the rear main seal (in front of the clutch drive gear), or rather from the rear output shaft seal in the transmission. the engine purrs but it leaks oil pretty badly. Park it overnight and there are oil stains under it, one at passenger side and one at driver's side. Give the Nulon Engine Stop Leak a try, we add a bottle to the oil at every oil change and no leaks ever. I doubt it is your rear crank seal and I am not so certain your pan, pan gasket, or drain plug is at fault. I pulled the backplate and the cork seal under the bearing cap looked normal. The oil leak also ruined the clutch. I was convinced the rear main seal was leaking. But I have taken the oil pan off and the only thing I was worried about was oil sludge and my pan was so clean. Any idea on how long the repair takes once the diagnosis is confirmed?. Reinstall the Dust shield and Starter (wires too). Our kit uses modern components to cure the common problem of the rear main oil seal leaking. When the Rear Main seal fails you will find an oil leak that is coming from the bottom of the vehicle where the engine and transmission meet. You can also try using thicker weight engine oil, like 50 weight. Any mechanic who describes it as that is dubious in my book. Replacing the Rear Main Seal If your car has the rope type seal, replace it with the newer neoprene seal. I took the bike to my mechanic who indicated that the oil might be coming from my rear seal. i have a '88 3. By now it was getting late in the day so I decided to go home and think about this for a while. The driver rear axle is leaking at the hub. The rear main seal is leaking but it will be a while before I can fix it. So, something is leaking, either the rear main seal, and/or the oil pump cover o-ring. It was leaking a lot of oil and it was puddling in the center of the car at the rear of the engine. You want to remove the main cap. Gravity and wind turbulence send oil to that spot. I don't want that in my truck. WipLash R/T 2/29/2004 15:08:20. Now it's leaking. Took them about a day cause they put on a new gasket and the guy told me they need the rest of the day for it to dry. Looks like the front main seal. Titan® Oil Stop-Leak is the safest, strongest and most advanced oil stop-leak on the planet. the engine was rebuilt about 12,000 miles ago. I took off the bellhousing inspection plate and found a puddle of oil in the bottom of bellhousing, started up the motor and saw drops coming from rear U shaped area of oil pan, its impossible to tell if its coming from pan seal or rear main seal. This will often be caused by a failed PCV valve which causes crank case pressure issues. Some of the drops hit the outside edge of the fly wheel which slings oil on the header and up in the transmission housing. REAR MAIN SEAL LEAKING FIXED WITH ATP AT 205 RE SEAL, HOW TO FIX A REAR MAIN SEAL LEAK STEVE ROB CHANNEL https://www. bottle for every 8 quarts of engine oil and it should at least slow down the leak and may even stop it. GOt oil coming from the seal wear from shaft goes in kind of looks like a rear main seal. I had a rear main oil seal leak on a 1995 Nissan pickup (at 90 k miles, out of warranty). Re-placing REAR MAIN SEAL. crank or cam shaft seal, oil pump. Therefore I belive you can drive forever with either an oil leak from the head or rear main seal, providing you dont run low on oil. Thicker oil on top of a clean PCV system will help reduce and possibly even stop leaks and consumption unless it's too late and that seal is completely blown. I had a similar leak. How did you know your car has a rear main seal leak? You have to go under the car to look at it for sure. Same thing rear main seal was leaking. on one of my oil change i used synthetic Mobil 1 and the rear main started to Pelican Parts Forums rear main seal leak - Pelican Parts Forums. Whether you have many miles on your engine or a fresh rebuild, you may be faced with replacing your rear main seal do to leaking. 0L) Most Mustang rear main seals feature a silicone, rubber or Teflon construction which wears out from age and the rotational forces from the crankshaft. AAMCO quoted me $600. Inspect lead-in edge of crankshaft for burrs/sharp edges that could damage the rear main oil seal. The Canton pan might be the problem (others know more than I do in regard to that, but I believe it may block some return hole or something, sorry I am totally ignorant on that), but in addition to the rear main seal (wrong type or installed improperly or facing a marred surface), Cam plug or oil galley plugs on the rear. A couple of the pieces are fairly substantial - the biggest one is around 20mm Long and 5mm thick. You might also want to change or check you pvc valve so as to make sure you're not building pressure in the engine which would cause the oil to find a weak spot, say in your gasket. I just put an engine in and i have noticed a little leak from either my rear main seal or my oil pan gasket. I have a manual transmission with roughly 105,000 miles and my rear main seal was still dry. The oil level was normal. On my 560SL the oil would leak out of the head and fill the valley between the two cylinder banks. This is another common leak path for the small-block. Based on your description, we recommend using the BlueDevil Oil Stop Leak. I thought adding the Blue Devil would help the gasket and a heavier and thicker oil would help. Any 8yr old engine is going to be prone to oil leaks, BMW, Rolls Royce, Holden or otherwise. The only way to stop a crankshaft oil leak is to replace the leaking seal with a new one. Smoke Often leaking oil from a rear main seal will drip onto the vehicle's exhaust and cause smoke to come from under the car. Installed a Genuine GM seal!. Upon reading that the rear main seal area of the block is not machined at the same time as the mains are, and that a lot of the blocks where machines off set by a couple of thousandths to the centerline of the crank. On my rear main retainer leak it looked like the seal was pushed into the motor. Leaking oil acts as an adhesive on the bottom of the car. My 360 has an oil leak that I thought was the rear seal. Rear main bearing seals keep oil from leaking at the rear of the crankshaft. The oil drain plug is dry. Tom used Lucas Engine Oil Stop Leak to fix a rear main seal leak on his Cadillac STS. The dealer put dye in the engine oil today to try and track where the oil is leaking from via blacklight. WipLash R/T 2/29/2004 15:08:20. Gaskets are made out of organic materials like every other bit on the car, and these break down with time. I don't think you'll find that anywhere in any service manual, but it definitely works and you don't have to worry about any oil leaks from the rear seal. To install the new rear main seal you want to take your time with this.