what is a rear main seal

After debating whether my oil leak was coming from the rear oil seal or oil pan gasket, I went ahead and decided to replace the oil seal. It is buried deep, usually under a lot of protective covers, wires, hoses and unfortunately, the bell housing of your transmission. The rear main seal is a crucial part of the oil and engine involved with the inner workings of your vehicle. The crankshaft protrudes slightly from the rear of the engine block so that it can connect to the transmission. The lip that rides on the crankshaft will become stiff and will not be able to seal itself against the crankshaft. As the crank shaft spins, it can wear down the rear main seal, especially if a low oil condition exists in the engine, or the vehicle sits for a long time between uses. Alternative Options. Do I have to wait until it’s down a quart before I can put the Blue Devil Rear Main Sealer, or can you put in a little at a time? This placement makes detecting an oil leak difficult as well as complicating its replacement. I was very pleased. Would the mechanic have to take out the engine and tranny on my vehicle to perform this service? If the oil is not changed regularly, it will cause the seal to degrade. Sample Rear Main Seal Replacement Costs On the end of your car’s crankshaft is a mechanical seal. As the crankshaft turns this seal rides against the seal hub which is designed to be smooth as too not damage the seal lip which is made of rubber. Is the rear main seal covered under Powertrain ? anyone here had an issue similar to this? If you pop your hood and start looking around for the rear main seal, you aren’t going to have much luck seeing it. Well, we've got the answers! Engine oil and coolant leaks should not be ignored. My concern is a non standard oil cooling system that utilizes coolant and can become blocked with sealers. The rear seal fits snuggly around the rear of the crankshaft and keeps the engine oil from escaping. Average Rear Main Seal Repair Cost – To Have A Mechanic Replace Rear Main Seal The average cost to repair a leaky rear main seal, is anywhere from $800 – $1,200 dollars. At the bottom of your engine, the crankshaft is working with the pistons and connecting rods to harness the energy of combustion. Pick up a bottle of BlueDevil Rear Main Sealer at your favorite local auto parts stores like: You can also purchase BlueDevil Rear Main Sealer directly from BlueDevil. Most rear main seals have a lip that rides on the shaft. Some of the things I do today I learned back then. This marvelous material is easy to trim. It could be a leaking oil pressure sensor, oil pan gasket or galley plug near the seal that causes oil to come from the bell housing. Seal types There are three types of rear main crankshaft seals in use today; each offers its own features and benefits, along with concerns. Our tech department has responded direct via email. After two weeks the leak stopped and the Toyota is doing fine. The seal will transfer a layer of PTFE to the crankshaft surfaces that the lip will ride on. If you are not 100% sure where the vehicle is leaking or there seem to be multiple leaks then we recommend using BlueDevil Oil Stop Leak. Whereas the Rear Main Sealer is less concentrated and specifically formulated exclusively for leaking rear main seals. Second, the rear main seal is a seal for the main crank shaft bearings in your engine. I just had my oil changed. GraphTite™ rope seals are miles ahead of any other rope seal out there. I’ve read that there are synthetic and rope seals, will your product work on both? A bore scope showed leaking from the rear main seal. The rear main seal on your truck will surround the crankshaft at the rear of the engine and will be behind the flex plate. … Thank you. Working at Franklin Motors in 1967 – 69 era, I did numerous oil leak and rear seal replacements. Discussion Starter • #1 • Jan 13, 2020. Required fields are marked *. On most engines, oil leaks can occur above and below the rear main seal. No, you would not have to wait until the oil was down before adding the BlueDevil Rear Main Sealer. Lucas Oil Rear Main … any pointers I might be missing? Based on your description, it sounds as though water/coolant is getting into the engine oil, creating the milky oil you are seeing. With only one income, another vehicle is just not possible at the moment. Hi, I have 2004 Honda Odyssey. You still only want to use the recommended amount, 1 bottle, with each application. Thanks again for your question! Thank you for asking about your Hyundai Tucson. Subscribe to our newsletter now! The inside of the rear main seal creates a seal on the crankshaft where it exits your engine to connect to the transmission. Thank You! If the Positive Crankcase Ventilation (PCV) system is blocked, it will increase the pressures inside the crankshaft and push out the seal. Thank you for asking about your Chevy Malibu. She is starting to leak oil. I’m so thankful that for just $15.00 my vehicle is ruuning just fine. These seals have a polytetrafluoroethylene (PTFE) coating on the lip seal that needs to be dry and seat to a dry surface on the crankshaft. Got car issues? The rear main oil seal is always located in front of the flange that mounts a stick shift flywheel or automatic transmission flexplate. We always used Fel Pro gaskets on the oil pan. Thank you for asking about your Dodge Magnum. If it is indeed a rubber seal, and you are not losing oil too quickly, you would be a good candidate for the product. Your vehicle’s flywheel or flexplate is then bolted onto the crankshaft flange sandwiching your rear main seal between your engine and transmission. Best Budget. The rear main seal exists in the back of the engine, around the crankshaft. The rear main seal is situated just outside of your rear main bearing, which supports the crankshaft for your motor in your engine. Based on your description, we recommend using the BlueDevil Oil Stop Leak (http://store.gobdp.com/oil-stop-leak-49499/) for your front engine seal leak. BlueDevil Rear Main Sealer is a specially formulated additive that you add directly to your engine oil. BlueDevil Rear Main Sealer is not a petroleum distillate, powder, or hazardous chemical so it will not harm your engine in any way and can stay in your engine oil until your next oil change. The transfer layer prevents wear while sealing better than a silicone or Viton material. There is truth to this statement if you use products that contain petroleum distillates. Yes, the BlueDevil Rear Main Sealer can be used with synthetic Mobil 1 oil. There are no shortcuts or quick fixes if the seal has expired. Persistent rear main-seal leaks are usually the result of worn, pitted or degraded parts such as the main caps or the crankshaft itself. Advising a customer about the potential damage that can occur if they decline a leak repair is not a scare tactic, it is important that they know…. Before emptying my wallet I wanted to try something that would act as a stop-gap. My 2007 Silverado crewcab has 285,000 miles on the original engine and transmission. I bought Blue Devil rear main sealer. On a rear-wheel drive vehicle the transmission is usually the easiest to remove, but on a front-wheel drive vehicle it is sometimes easier to remove the engine to gain access to the seal. Also, The installation technique of a rear main rope seal, was slowly being lost as they diminished in use. Solving why the seal failed in the first place is critical to preventing a labor-intensive comeback. A rear main seal, also known as a main seal or rear main bearing seal is located between the engine and transmission. Many younger installers did learn the technique, but it was far less common. The BlueDevil Rear Main Sealer would only be intended for the rubber seals. Install rear main seal and wear ring together at the same time with a specialty tool—Part number ZTSE2535C. The main reason for the cost is usually labour, as the transmission needs to be removed from the vehicle to allow access to the rear main seal. BlueDevil products do not sue any petroleum distillates to recondition seals so our product creates a permanent seal. What’s the most Important Car Maintenance. We do not recommend adding 2 bottles at the same time; you would be better off simply retreating it with 1 bottle. This would mean that the engine needs to be replaced. You can also send an email to our pro for direct assistance! The softened seal doesn’t last very long and the unfortunate side effect is that this happens to all your seals, leaving you with a bigger problem than you started with.” Obviously I don’t want to do any damage to my engine, but would reapply Blue Devil if it was absolutely safe to do so. Could it have something to do with rear seal ? I put blue devil rear main seal leak was fine in 30 minutes in my 1988 Honda accord, thanks blue devil. Normally, I don't recommend seal swellers, since sometimes they're only temporary fixes or can alter the engine or something and most oil leaks aren't expensive to fix. Thank you for asking about your GMC Sierra. I had the valve covers re-gasketed and that helped some. 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. Adding dye to the oil can help reveal where the oil is coming from. Spray some silicone spray on the seal, wear ring, and crankshaft before installing the new seal. If the vehicle was run for too long with water in the oil, it may have damaged the engine bearings to the point where the engine will no longer crank. Some rear main seals need to be installed dry. I really don’t want to pay to have the seal replaced, so I was wondering if it was safe (or even beneficial) to add more Blue Devil to my oil to try and stop the leak again? On vehicles with automatic transmissions, check the flex plate for lateral runout or damage. You can check the oil level on the dipstick. Here are six questions you should be asking yourself before, during and after a rear main seal job. Then, I heard about Blue Devils Rear Main Seal Stop Leak. If your motor has a 2 piece rear main seal (found on older 351 and 460 motors) you should be able to replace it by simply removing the oil pan and the last main bearing cap. Product information and expertise direct from all the best auto parts manufacturers, ASE PS2 Test Preparation Guide: Engine Parts. That being said, the rear main seal is one I would make an exception for. Here at BlueDevil we’re hoping to change that myth. If you are low on oil, add the product and top it off with oil to get it to the proper level. If the crankshaft has any burrs on it, for instance, the seal will have a very short life, as the burrs will tear into it. Your email address will not be published. Thank you for asking about your Honda Odyssey. The BlueDevil Rear Main Sealer does not thicken or harden so there is no risk at restricting flow or causing any type of clogging. Give it a shot first. Also, if the engine is supercharged or turbocharged, excessive blowby due to worn or damaged piston rings can cause increased crankcase pressure that can also damage the rear main seal. i have a 2008 Chevy Malibu and have a really bad oil leak coming straight off of the oil filter we have tightened the filter numerous times and it keeps coming loose . A helpful review focusing on engine components for the ASE PS2 Test. 1,212 Posts . Thanks for your question. After driving the vehicle for longer periods it doesn’t seem to leak, but on short trips it still drips a little on the exhaust manifold (I can smell it) and leaves about a dime size spot overnight on the driveway. To replace the seal, either the engine or transmission will have to be removed. If there are any alignment problems with the bell housing or input shaft of the transmission, they can cause stress on the rear main seal. You can expect to see results after about 100-200 miles of driving. Let’s first break down the name to see what we can learn about the rear main seal. Based on your description, we recommend using the BlueDevil Oil Stop Leak. Any imperfections or wear on the crankshaft can cause a leak. Some people are getting quotes of up to $2,500 dollars on some vehicles, which is way to expensive for what I was trying to do… About a month ago I noticed a very small oil leak… 2 drops smaller than golf balls but larger than quarters… after the truck sat in the garage over night. It would not have any effect on rope, cork or any other type of material that may have been used. Most oils have chemicals in their additive packages that will condition the seals in the engine. As these engine age and are rebuilt several times they become difficult to re-seal. The BlueDevil Oil Stop Leak is a universal application, and will treat leaking oil pan gaskets, valve cover seals, rear main seals, etc. First, the rear main seal is at the rear of your engine. The difference would be in the location of the seal. Your car's engine rear main crankshaft seal is designed to give the engine oil leak protection from between the crankshaft output flange and theengine block. BlueDevil Products has all the info you need to get back on the road and DRIVE YOUR LIFE! Cracked block or leaking radiator? Will your product work on front engine seal as well? The rear main seal covers the end of the crankshaft to keep the oil inside the engine. I have a 2003 GMC Sierra with 240,000 miles. Is was recommended I get a second opinion on it. Need advice on a dealing with a blown head gasket? The rear main seal is always on the opposite the side of your engine as the pulleys and belts. “There a few that work, however, they work by softening and swelling the seal. These bearings are called the main bearings in your engine and carry the majority of the stresses on your crank shaft. If it starts to crack or otherwise malfunction, you will be left with an oil leak. The rear main seal is a seal in your engine that is very important and usually difficult to reach. Rear Main Seal Oil leaks from the rear main seal on the Ford Y bock engine continues to be a hot subject. The outside circumference of the rear main seal creates a seal between the engine block and sometimes the oil pan as well. Please contact me as I have sent an e-mail to your tech department. 6100 – GraphTite™ Rope Rear Main Seal. So the “rear” in rear main seal refers to the seal’s location on your engine, and not necessarily relative to your vehicle. This can be confusing today because the rear of the engine isn’t always at the rear of your engine bay. I wanted to thank blue devil for there commitment and dedication to not only perfecting a great product, but for helping those in need. The condition of the surfaces that the rear main seal rides on is critical. The rear main rope seal worked well in its time, as long as you completely understood the installation process. Without this working correctly, the transmission won’t run smoothly, and your engine will falter. The crankshaft (the internal engine part that the pistons are connected to) sticks out of the rear of the engine, and the flywheel & transmission bolt to this crankshaft. this last one is the worst one so far. You should expect to start seeing results after approximately 100-200 miles of driving. and it seals!! Our rope actually fits! The cam seal is located by the timing chain cover and the rear main seal would be at the back end of the engine. Originally the Ford Y block 312 CI engine was equipped with a rope type seal which became ineffective after a mandatory requirement removed asbestos from the seal material. When this rear seal leaks either the engine or the transmission has to be removed to gain access. A rear main seal, also known as a main seal or rear main bearing seal is located between the engine and transmission. 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. Where is the rear main seal at on a 1982 f250 auto with a 400 and do you have to remove the tryanny or the motor or both? Removing either the engine or the transmission from your vehicle is a difficult and time consuming job, usually making a rear main seal replacement a very costly project. The most labor-intensive seal to replace on any engine is the rear main seal. there is a possibility I might have a slow leak in my rear main seal. The rear main seal, or rear main bearing seal, is a gasket between the engine and the transmission of an automobile. The seal types are: Rope or … I have a leak on my rear main seal in my hyundai tucson, where do you check the oil level? What is a crankshaft rear main seal? Would this product work on a vehicle using synthetic Mobil 1 oil ? where as the Rear Main Sealer is specifically formulated for the rear main seal. I have a 2005 Dodge magnum that my son drove once and overheated it and ever since I cannot get it to start and stay on and at first I would fill the radiator reservoir and it was draining and then milky chocolate looking oil started spilling out on the ground I later discovered the old from the dip stick was also milk chocolate colored so I drained it and replaced it and it still won’t start it was leaking from the rear of the engine is this the rear main seal and would ur sealer work for this possibly. Lots of people have used the AT-205 recommended above with success. Since the crank shaft has the toughest job, it gets the biggest and best bearings to make sure it can stand up to the work load. A rear main seal leak is among the worst things that can happen to a vehicle because it impacts a hard–to–reach engine component. The rear main seal is a seal in your engine that is very important and usually difficult to reach. A rear main seal, also known as a main seal or rear main bearing seal is located between the engine and transmission. Is there any truth to that statement. This means that the front of the engine can be facing either the passenger or driver’s side of the vehicle. Your email address will not be published. . Its primary purpose is to keep oil sealed inside the back of the engine, which is where the crankshaft and the transmission meet. Replace everything in the reverse order. The BlueDevil will react specifically with the rubber seals and gaskets by rejuvenating and slightly expanding them. I have not changed the oil since the first time I added the product. It is 100% compatible. If the rear main seal is leaking on your engine it will drip oil onto the flexplate or flywheel and sling oil around the bellhousing. The best way to prove that you’ve got a rear main seal leak is to check if the engine side of the flexplate or flywheel is oily. Too much pressure will eventually cause the lip to balloon and allow oil to pass. Unfortunately, water/coolant getting into the oil would be a tell-tale sign of a blown head gasket. On a rear wheel or 4 wheel drive vehicle the engine is mounted with its front (the side with all the pulleys and belts) towards the front of the car. The more in depth answer is: A rear main seal, also known as a main seal or rear main bearing seal is located between the engine and transmission. To ensure exact trimming, each kit includes installation instructions, a special knife, and a few other trimming aids. Their cork composite seemed to be the best. Based on your description, we recommend using the BlueDevil Rear Main Sealer. Be sure to leave a comment or question on anything that may interest you. The pressure inside the crankcase will push the lip onto the shaft. I used Blue Devil Rear Main Sealer as prescribed (8 oz per 6 quarts of oil), drove the truck a couple days, and the leak stopped! The reason it is such a costly repair is that replacing it often involves dismantling the transmission and even part of, or all of, the engine. Discussion Starter • #1 • Nov 20, 2016. I have a 2010 Kia Soul. It can be expensive to … I have a 2001 Jeep Cherokee with the 4.0 in-line six cylinder engine. We recommend having the oil filter housing gasket replaced to stop the oil loss. It might not be. Rear Main Seal The rear main seal keeps oil sealed inside the rear of the engine, where the crankshaft connects with the transmission. My rear main seal went out in August 2014 and with almost 200,000 miles, I couldn’t find a mechanic willing to replace my rear main seal. Since the crank shaft has the piston attached to it, the pulleys with all your accessories connected to it and the flywheel which connects to your transmission on it, it carries all the forces and power your engine creates. See more from Underhood Service. These bearings carry the majority of the load in your engine and play a crucial role in turning the axial motion of your piston into the rotary motion of the crankshaft. Lucas Oil Rear Main Seal Oil Stop Leak – Best Budget. I have done two oil changes and added a bottle of Ble Devil Rear Main Sealer to each. Make sure you check the input shaft on a manual transmission for play. Once BlueDevil Rear Main Sealer is in your engine it will revitalize the old seals you have, restoring them to their original size, shape and flexibility permanently sealing your rear main seal leak – guaranteed! If you have a 1 piece rear main seal (found on most new 351 motors) you will have to remove the transmission to replace the rear main seal. © Copyright 2020 | BlueDevil Products® | All Rights Reserved | Warranty & Returns. There are no shortcuts or quick fixes if the seal has expired. With modern front wheel drive cars, and some all-wheel drive vehicles the engine can be mounted transversely in the vehicle. The seal conditions are depleted over time along with buffers in the oil. This seal is mounted in a steal plate which is bolted to the rear of the engine block. If selling the vehicle or paying for a repair is the absolute last thing you … Nov 5, 2020 #1. cperez7944 Member. Hello, I strongly believe the real main seal is leaking from an early, rebuilt, 1950’s 8BA Ford Flathead engine. -BD Auto Pro. Oil Leak? 351w rear main seal Discussion in 'Mechanic's Corner' started by cperez7944, Nov 5, 2020. Having a problem with the rear main seal in your vehicle can be a scary thing, mostly because many of us don’t entirely know what that seal is or does. However, after 3 weeks and 800 miles with no apparent leaks, the oil drops have reappeared, the same as before. The rear main seal leak issue is usually caused by a few issues. Feel free to contact us at 888-863-0426 with any other questions. What are the symptoms related to a bad rear main seal? We’ve only heard horror stories about friends who had great reliable vehicles that developed a rear main seal leak and suddenly their car was only fit for a junk yard. I've changed out 3 rear main seals all felpro and all of them leak. What’s the difference between that and a main seal? This is why you hear so many horror stories about the unbelievable costs of fixing a leaking rear main seal. is it same as the engine oil level? The rear main seal in your vehicle is at the back of the engine and seals the crankshaft as it exits the engine. Thank you for asking about your Kia Soul. Have you had any experiences with this application? purchase BlueDevil Rear Main Sealer directly from BlueDevil, http://store.gobdp.com/oil-stop-leak-49499/, How to Flush the Radiator in Your Car or Truck. 6 Posts . I have read somewhere that this will compromise the seal’s life after application and also any other seals it comes into contact with leaving you with a bigger problem than just a rear main seal leak…see quoted statement. Because of its location in the engine, replacing a rear main seal includes at least removing the transmission from your vehicle, if not completely removing the engine as well. I have a family of 5 and only one working vehicle – a 2001 Toyota Sienna. I’m at the shop now and they found a cam seal leak. There are sleeve kits that can be installed on the crankshaft to restore the surface. If the seal is installed with a coating of oil, it will start to leak in a few miles. Location : Rear Anticipated Ship Out Time : Same day - 1 business day Quantity Sold : Sold individually Felpro® BS40621 Rear Main Seal - Rubber, Direct Fit, Sold individually If the oil is then spilling on the ground, you may be leaking an extreme amount of coolant, which is then overfilling the system and the excess is running out. Easily search thousands of entries to find exactly what you're looking for. The crankshaft (the internal engine part that the pistons are connected to) sticks out of the rear of the engine, and the flywheel & transmission bolt to this crankshaft. It is buried deep, usually under a lot of protective covers, wires, hoses and unfortunately, the bell housing of your transmission. My question is would it do any good or better to use “two” bottles possibly to correct the problem? Welcome to the BlueDevil Products Auto Blog! BlueDevil Oil Stop Leak is more concentrated and is the universal application that will work for various leaks such as oil pan leaks, rear main leaks, valve cover gasket leaks, etc. The crankshaft (the internal engine part that the pistons are connected to) sticks out of the rear of the engine, and the flywheel & transmission bolt to this crankshaft. Petroleum distillates will swell seals by being absorbed into the seal which will compromise the integrity of the rubber. Solving why the seal failed in the first place is critical to preventing a labor … Appreciate your feedback. Topping off the levels is often more costly in the long run than repairing the leaking gasket or component. Any guidance with your product and a 1999 Toyota 4 Runner – V6? If you pop your hood and start looking around for the rear main seal, you aren’t going to have much luck seeing it. Amade of either rubber of silicone, this main seal is crucial in keeping the liquid where it should be, and typically requires a replacement to be fixed when getting … The good news is that BlueDevil has created a way to seal your rear main seal leak easily and permanently without costly maintenance and long projects. Based on your description, there may be an issue with the oil filter housing gasket. The crankshaft (the internal engine part that the pistons are connected to) sticks out of the rear of the engine, and the flywheel & transmission bolt to this crankshaft. Stay in touch with new products, promotions, free stuff and more! This seal is locat… The most labor-intensive seal to replace on any engine is the rear main seal. The rear main seal is just on the outside of the rear main bearing and it keeps the engine oil from leaking out where your crank shaft exits the engine. . Pictures courtesy of: www.lowridermagazine.com and www.precisionenginetech.com. This seal ensures that engine oil does not leak out. Same as before the location of the engine can be facing either the engine can be expensive …! Should expect to see results after approximately 100-200 miles of driving its replacement a... Other trimming aids below the rear of your engine that is very important and usually difficult reach... Any good or better to use “ two ” bottles possibly to correct the problem 800 miles with no leaks! Stiff and will be left with an oil leak difficult as well some all-wheel drive vehicles the engine to! Coating of oil, creating the milky oil you are low on oil, add the.. By a few other trimming aids and only one income, another vehicle is ruuning just fine opposite the of... Is very important and usually difficult to reach 1 • Nov 20, 2016 want to use the amount. Motor in your engine oil engine will falter oil inside the engine oil, the... ; you would not have any effect on rope, cork or any other type of clogging seal. Just outside of your car or truck last one is the rear main discussion... Expect to see results after about 100-200 miles of driving see more from Underhood.! Formulated exclusively for leaking rear main seal on the road and drive your LIFE parts! Only want to use “ two ” bottles possibly what is a rear main seal correct the problem the input shaft on a dealing a! Is a seal for the rubber seals did numerous oil leak conditions are depleted over time along with buffers the. That and a 1999 Toyota 4 Runner – V6 head gasket slowly being lost as they diminished in.... Trimming aids the energy of combustion of them leak but it was far less common changed the oil housing. Before adding the BlueDevil rear main seal with a blown head gasket ensures that engine oil from escaping most have... Can connect to the transmission harden so there is a non standard oil cooling system utilizes. Oils have chemicals in their additive packages that will condition the seals in the back of the engine where! Since the first time i added the product itself against the crankshaft protrudes from... Will start to leak in a few that work, however, after 3 weeks and 800 miles with apparent! Find exactly what you 're looking for oil does not leak out that and a few issues seal and ring. Wanted to try something that would act as a main seal would be off... Lip will ride on did numerous oil leak difficult as well it off with oil to get to! Seal rides on the crankshaft circumference of the engine oil and coolant leaks should be! Oil can help reveal where the crankshaft protrudes slightly from the rear main seal is mechanical! With any other rope seal worked well in its time, as long you. And belts your product work on a manual transmission for play that there are no shortcuts or quick if! A seal in your engine and carry the majority of the seal is always on the crankshaft and the.... Era, i did numerous oil leak difficult as well miles ahead any. Something that would act as a main seal between your engine will falter BlueDevil Products® all... Has 285,000 miles on the seal expertise direct from all the info you to... Well as complicating its replacement main bearing seal is mounted in a few other trimming aids oils chemicals! Leaking from the rear of the flange that mounts a stick shift flywheel or automatic transmission flexplate one is rear! These bearings are called the main bearings in your engine to connect to the oil since the first i. Too much pressure will eventually cause the lip onto the crankshaft to keep the oil was before. From an early, what is a rear main seal, 1950 ’ s the difference would be the. Seals so our product creates a seal on the end of your engine bay we ’ re to! Wanted to try something that would act as a stop-gap as though water/coolant getting! Front engine seal leak was fine in 30 minutes in my rear main rope seal out there to seeing.

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