Turns out, the rear main seal bore was off center to the crankshaft centerline. I will try to run it with less oil in the pan and see if that helps. The reman company had messed up when line boring the main caps, and cut them off center. Symptoms and diagnosis of a rear main seal oil leak failure in the 3.6L Pentastar V6 of my 2014 Jeep JK Wrangler Unlimited. Quote Reply Topic: rear main seal failure again? I just add oil before I go for a ride, but I am getting sick of it leaking. When I bought my truck almost 3 years ago the front pinion seal was found to be bad at 12,900 miles. later and it is pissing out the belhousing. If you're just getting the rear main replaced then you should either have the torque converter (if it is a automatic) looked at, or if it's a manual get the clutch/pressure plate/ and flywheel looked at to see if they will need replacing. IOW, if BOTH inlet & outlet are blocked, you. Just watch your gauge. Discussion in 'Skid Steers' started by 05sprcrw, Dec 6, 2018. That's the fresh air inlet, why not connect it to the crossover tube where it's supposed to be? A rear main seal leak can sometimes be the last nail in the coffin for an older car with a few other problems, or an expensive repair that leaves your bank account on “E”. If a bike exhibits repeated rear seal failure at frequent intervals, then my experience is the same as yours; usually main bearing play rather than thrust-bushing/end-play. It might not be. Since the oil will build up in the bellhousing during the drive and then leak out when parked it may make quite a puddle. Due to the location, it is subject to high oil pressure. Most rear main seals have a lip that rides on the shaft. Hydraulic Seal (H60) Clutch Fluid with Stop Leak (1350) Super Leak Fix (1305) Jack Oil with Stop Leak (HJ12) Power Steering. Pinion Seal Repeat Failure. Drive your vehicle as you normally would and the rear main sealer will get to work. I do NOT want it to devolve into a general/technical discussion on the merits/demerits of any particular seal type. But now that it's free-flowing, you should put some kind of filter in the inlet, otherwise dusty, dirty air will be pulled through the crankcase. The camshaft welch plug could be leaking. A rear main seal leak is among the worst things that can happen to any vehicle because the rear main seal is very hard to reach and it requires much of your engine to be disassembled. Contributing Member; Contributing Members; 0 19 posts; From: Sacandaga Lake; Share ; Posted July 29, 2003. The longer the engine is run before I shut it off the more it will leak. Concentrated Rear Main Seal Repair (1040) Super Leak Fix (1305) One Seal Stop Leak (1334) Oil Seal Engine Oil Burning & Leak Repair (OS-1) Hydraulics. He said that it cured his problem. Rear Main seal failure. Rear main seal leaks are one of those dreaded problems with your car that are hard to understand and even harder to fix. The best part of it is that it doesn't cost anything! If you haven't checked out the tech FAQ section, go to: There ya go! Had it replaced at a GM dealer. Actually the link was to a 3A  page illustration of a flathead PCV system, which is basically what you should have on a 2A. The 2012 GMC Terrain has 3 problems reported for rear main seal failure. The rear main seal will start to leak oil and can also lead to misfire or lean codes causing a check engine light. Solving why the seal failed in the first place is critical to preventing a labor-intensive comeback. Normal oil level is already. My rear main seal was leaking . It can seal leaks in the main seal within a few hours of driving, though it may take up to 2 days for it to work completely. Pour 1 bottle of this rear main sealer directly into the engine and start it back up. Just leaving the oil filler nipple open would vent any pressure build up. Jan 27, 2016 #1 Hey everyone. For a better experience, please enable JavaScript in your browser before proceeding. On most modern engines, the seal’s failure is due to a condition inside the engine or a component connected to the back of the engine, and is most common in older cars. '07 335i, Sparkling Graphite Metallic, Premium, Sirius Sat Radio, Steptronic, Nav, Logic 7 Premium Sound, Continental RunFlats. Bobcat S300 Rear Main Seal. A clogged vent will cause pressure to build as the transmission heats up. Suspect rear main oil seal. For a list of all the failed part shows, check out “Failed VW Part Videos” on YouTube. An easy way to do that is to run the engine with the dip stick cover loose. Joined: Apr 5, 2017 Messages: 68 Location: South East Nebraska. Removed covers for access. I got a Felpro rope seal from the auto parts store and installed that went for a ride and no leaks then I parked it in the garage and still no leaks came back 15 min. A forum community dedicated to BMW owners and enthusiasts. But the reason why the high pressure pump or other valley oil leak looks like a rear main seal is because there is an oil drain hole in the rear of the engine valley.7.3 valley oil leaks will cause oil to run down the back of the engine and … Learn about this problem, why it occurs, and how to fix it. I just have a rubber hose connected to the side of the dipstick tube and I ran it to the back of the jeep behind the rear tire. Rear main seal leaks are so dangerous because it is possible for the leak to occur at a very fast rate. Honda Civic Engine rear main oil seal may leak - 54 reports. BEST REPRODUCTION AVAILABLE! The previous owner said the motor was rebuilt about 10 years ago. They will keep the splashed oil from leaking out, but not oil that is standing above their level. Rear Main Seal Failure. WILLYS REAR MAIN SEAL. Rear main seal failed due to manufacturer defect causing oil to leak on to hot engine. C. ComputernerdBD Well-Known Member. Typically, when you notice an oil-covered starter, the oil leak is coming from the engine’s rear main seal, which unfortunately is common, especially in older cars. Go. Today we are diving into the 2.5L vacuum pump leaking oil. This item is a very high quality new production crankshaft rear main seal. Thread starter ComputernerdBD; Start date Jan 27, 2016; 1; 2; Next. Of course it will leak out the bellhousing during the drive some. If it was the seal I would think it would leak while the engine was running. This is commonly seen on Audi engines as well. I removed it and it was a neoprene one like the ones from Walks. The rear main seal is not a wearing part and should last for the life of a vehicle if well designed. Every 2. 1 of 2 Go to page. If the crank seal journal is rough/scored/pitted, etc., NO seal will work 100%. The average cost to repair a leaky rear main seal, is anywhere from $800 – $1,200 dollars. It is required to remove the transmission to replace, so if you find it on a pre-purchase inspection keep this in mind. 0 tsi engine in Tiguan, cc, gti, jetta and eos experiences the same failure at around the same mileage. Item #3B71-1. After break in of my GPW rebuild I decided to treat it to synthetic 10w-30. it only leaked after I shut the motor off. My jeep has a little blowby, not bad but the girlfriend dosn't like the smell. Whats up Guys hope everyone is doing well, Today we will be tearing apart the Audi A4 so we can see if we can find where the oil leak is coming from. 05sprcrw Well-Known Member. The seal itself is only half of it. Earlier this year I pulled the motor and pumps from my high hour bobcat. Here are six questions you should be asking yourself before, during and after a rear main seal job. After a run it would leave a large puddle. Correct for either the L134 or F134 Willys Jeep engines. Oil leaking severely. But these would both leak, Crankcase pressure is a non-starter: can't happen in an L-134, True, but makes no sense in the context of the L-134. The sealing surface of my crank was in great shape. I know its … Average failure mileage is 104,700 miles. If the clearance between the bushing and the driveshaft slip yoke is excessive, both the bushing and the seal must be replaced. Come join the discussion about Bimmerfest events, production numbers, programming, performance, modifications, classifieds, troubleshooting, maintenance, and more! I don't have a pcv valve . You got me to do some research and I found out that there is a crankcase ventilator valve mounted on the side of the intake with a hose going to the valve cover on the side of the block. BY BEST GASKET . Oil pressure has no effect on main seals although an overfilled engine can certainly leak oil past a main seal; and especially if there’s a PCV problem. Specifically for the health of your rear main seal, you should consider changing your engine oil regularly to avoid pitting or corrosion of your crank shaft. It is Tuesday, so we are looking at failed VW parts. Funny thing is when I was about 17-18 years old and in high school (more than a few decades ago) I believed the same cxxp when I worked part time in a gas station. I have just had mine done on my 12 plate, also turbo inlet oil seal failed as well, both covered on warrenty, looks like a common fault. Since the rear main seal is in a position that you won't be able to slide under your car and view it directly you need to go through a process of elimination. Quote Reply Topic: Rear Main Bearing Seal - success or failure Posted: 30 July 2011 at 1:11pm : THIS IS A POLL ONLY, to collect factual data on running engines. He said that the "fix" is to just drain a little oil out of the pan and not keep it full. Bringing the BMW community together. The pressure inside the crankcase will push the lip onto the shaft. Reply to this topic; Start new topic; Recommended Posts. Is there something else in the bellhousing area that could be leaking? The funny thing is, this vacuum pump leaking is often mistake for a leaking rear main seal. I removed it and it was a neoprene one like the ones from Walks. This placement makes detecting an oil leak difficult as well as complicating its replacement. They promised this was why it was leaking and stated they ruled out any other causes such as crankcase pressure, or crank problems. Other seals such as brake, transmission and axle seals also experience damage from extreme cold conditions. http://forums.roadfly.com/forums/bmw/bmw_3_series_e90/9259517-1.html, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Crankcase vacuum exceeds the normal range in the engine under heavy acceleration and sucks in air damaging the rear main seal. This forum thread shows many owners with the same issue at around the same mileage. It sounds crazy, but, I was told by an old Jeep mechanic that the seals were never designed to hold standing oil. They had to give him another engine. The rear main seal, or rear main bearing seal, is a gasket between the engine and the transmission of an automobile. AHHH HAAAA, so you have a CJ3B, not a CJ2A. but best of all I ran the jeep for 15 minutes and so far no oil is leaking. To replace the rear main seal, you need to remove the transmission from the motor. Yes, that's a strong possibility. Dranon. I did read all the seal related post on this forum already but I am not sure the seal is the problem. BOP Engineering Viton® Rear Main Crankshaft Seal Instructions for RMS01 (3”) & RMS02 (3.25”) main with CRANKSHAFT REMOVED Thank you for choosing the BOP Engineering Viton® Rear Main Seal, which is a direct replacement for the stock rope seal. Next Last. I suspect your "extra long" hose was creating back-pressure. The hose I had from the dipstick tube used to have positive pressure on it ,but I took the valve apart and cleaned it and now there is negative pressure on the hose just like in the pic. This jeep has been doing this since I bought it a couple of years ago  . Checked sump plug - OK. Oil leak behind flywheel." Dranon 0 Posted July 29, 2003. I have a small round air cleaner right on top of the carb. You might want to check your PCV valve and the plumbing related to ventilating your crank case. Did you check it when you replaced the seal? Things like sand, salt or road grime can cause premature failure of your rear main seal from the outside in. A failing air oil separator (aos) is the likely cause of rear main seal failure and oil leaks, as it is in other VAG cars. The sealing journal on the crankshaft is the other half. I told one other person this, who was having the same problem. It seems that these primarily fail due to excessive crankcase pressure caused by failed PCV valves as described above. Residual pressure should drop out fairly quickly. If you seem to be losing oil but you don't have a noticeable drip when the car is parked you may be in the early stages of a leak. Off-road vehicles endure conditions that include rocks, thick dust and variable temperatures that the average motorist seldom faces. Thanks Sean I think it is fixed, tomorrow I will take it out for a long ride. Complete loss of all power and NO warning in heavy traffic, all due to the failed frozen PVC valve. On 1/27/2019 the rear main seal blew while driving at 70+ mph on a 5 lane freeway. With today’s attention on keeping cars longer, it pays to take care of oil leaks before they rack up repair bills. On most engines, oil leaks can occur above and below the rear main seal. I thought it would be between that hose and the air cleaner, but my stock air cleaner is long gone. Severe cold cracks seals and causes seal failure. Unless it's plugged/kinked/pinched, but also depends on your valve cover outlet. If I run it for 5 minutes it will just leak a few drops, if I run It for an hour It will leak about 12 onces. What Happens if the Rear Main Seal Fails. Rear main seal failure #3. By Dranon, July 29, 2003 in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa) Share Followers 0. Average Rear Main Seal Repair Cost – To Have A Mechanic Replace Rear Main Seal. I looked it over and it looked fine,Don't see why it was leaking. JavaScript is disabled. It is also connected to the engine, which must be slick with oil to function properly. This pressure will cause fluid to bypass or damage the extension housing seal. Last week we looked at how a 2.0T rear main seal fails. Gear oil at the pinion seal. This will be mainly a helpful post with a little back story about a few things I learned with this rear main seal. However, for both oilheads and airheads, those are pretty rare, and even on high mileage airheads with worn thrust inserts, there is rarely a correlation to rear seal failure. Correct for Willys MB or Ford GPW WWII jeeps as well as Willys CJ2A, CJ3A, CJ3B, M38, M38A1 and early CJ5 and CJ6 with the F134 engine. Is it the rear main seal that is leaking? It now runs 20w-50 regular oil in the summer and there are no leaks. I looked it over and it looked fine,Don't see why it was leaking. good thing you are smart enough to pay attention, i'm sure a lot of people would have just driven away until they get the oil light and probably some engine damage. kctinner. The seal may and can ride on the serrated area of the stock crankshaft with no issues. Too much pressure will eventually cause the lip to balloon and allow oil to pass. So no belts of any sort need to be pulled off. Super Leak Fix (1305) Power Steering Repair (1600) Also, if the engine is supercharged or turbocharged, excessive blowby due to worn or damaged piston rings can cause increased crankcase … What starts with a small oil drop on the driveway here and there can quickly escalate into a damaged starter and other problems. Posted: 09 Dec. 2011 at 3:48pm : My rear main seal was leaking . A worn extension housing bushing can lead to extension housing seal failure. Just a thought. :bawling: I had the car recovered to my dealer, where they confirmed that the rear main oil seal had failed. . July 6, 2016, 4:07am #9. the engine is a 4.0 sohc with 150,000 miles the timing chain tension broke was reason for rebuild. If the Positive Crankcase Ventilation (PCV) system is blocked, it will increase the pressures inside the crankshaft and push out the seal. The car was of course not able to be driven. no oil comes out the hose so i don't think crankase pressure is the problem. No, I have a cj2a but the pic I found was from a cj3b. It sounds like your building up pressure in the crank and forcing oil out. Rear Main Seal, L134 or F134, $31.00. Finally, the rear main is one of the LAST places that fail or leak on 7.3’s.Because of the placement of the high pressure oil pump, a 7.3 HPOP leak can appear to be a rear main seal leak. The rear oil gallery plug could be leaking. it only leaked after I shut the motor off. What weight oil are you running? There are many reasons you should regularly change your engine oil. Off-road driving may also involve crossing creeks or even driving along the beach. The dealership told me last time that there was an update to the installation procedure for the rear main seal and Ford advised them not to use some special pressing tool to install it. 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Occur above and below the rear main seal then leak out when parked it may make quite a puddle are... Metallic, Premium, Sirius Sat Radio, Steptronic, Nav, Logic 7 Sound. Into a damaged starter and other problems told by an old Jeep Mechanic that the seals were never to...