how to tell 1 or 2 piece rear main seal

Make sure the seal lip is the right way. D. These blocks are machined to operate a mechanical fuel pump. Thanks, not the news I was wanting but thanks! So it's true one piece rear main seal blocks will have a passenger side dipstick however so will two piece blocks so don't use that as a guide. The 1-pc RMS looks exactly like the front seal, except a little bigger. The seal. There are four main factors to consider when purchasing a flexplate. 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. 980 Posts . Discussion Starter • #1 • Nov 20, 2009. at the point in my engine build that I want to install the rear seal. 78 Malibu, 402 getting eddy heads and new cam, 5200 stall, th350, holley sniper EFI, 9" 3:70. Profile Page. Your vehicle’s flywheel or flexplate is then bolted onto the crankshaft flange sandwiching your rear main seal between your engine and transmission. A once piece is one complete circle without breaks. The one piece goes on over the back of the crank shaft to replace it. Re: How to tell? The rear main seal is at the back of the engine. “Everything we’ve run them in so far has done just fine,” sums up Kaase. C. Crankshafts utilize a 2-piece rear-main seal. The crank flange is perfectly round and smooth, like the end of the cam. Molded synthetic rubber is the material most commonly used for rear main … the two piece seal is installed inside the rear main cap...it cannot be installed without removing the oil pan, and then the main cap.... the cranks are different. The bolt pattern for the flywheel on … Couldn't find what I was looking for in the search and this is as close as I got. This means that half of the seal is on the rear main bearing cap and the other half is on the engine. The oil pans are different as well 55-79, 80-85, 86-99 and there are variances within those years too. an older 2 piece seal doesn't have the bolt on seal carrier, and has a counterweight cast into the back of the crank. Mike, the 2.8 V6 is known for rear main seal leaks. The two piece you need to remove the rear main bearing cap to replace it. Did it have a rubber or rope seal in it when you went to change it? 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. 1 or 2 pc rear main seal? 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 … Rear main seal leakage remains a problem on engines that still use 2-piece rear main seals. Also it is internally or externally balanced. Casting number will easily ID the block. I have oil pan and pump off how do I tell if it has a 1 or 2 piece rear main seal? We all know the time honored method of offsetting the seal parting lines so they do not match the main cap to block interface. Joined: Dec 2, 2004 Posts: 1,517. I am going to change my oil pan gasket and 2 piece rear main seal as they are both leaking. That's a one piece correct ? To learn more about installing the rear main seal and other gaskets and seals, visit Garage Gurus at http://fmgaragegurus.com. no they will not two different bolt patterns or so Iam told. 26 X 8.50-15 M/T slicks. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! The old seals pulled right out with no effort ; just an easy pull with a little pair of pliers. It goes in a retainer piece that bolts on the back of the block. The 1-pc RMS looks exactly like the front seal, except a little bigger. Well I am assuming that the fact it was leaking was not news you wanted to hear either? Beginning in December 1982, Ford went to a one-piece rear main seal on the 5.0L engine, which is a better sealing system than the two-piece. Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs. The problem with the two-piece seal is that it can sometimes allow oil to seep out. But it's nice to have options--the more the better--and I imagine a 1-piece seal is far less likely to leak than the 2-piece style. #1: The easiest and most obvious solution to any problem is 99% of the time correct. Dipstick is on the passenger side 84 k10 305. If it's a counterweighted 350 it will be a one piece. from williamsport,md. Rear Main Seals. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Thank You! It's a meta-clad lip seal. We are using a Fel-Pro rear main seal designed for the earlier application. The crank style: One or two piece rear main seal. The big block Chevy engine uses a two-piece rear main seal through 1985. bodymanmp. 1 pc or 2 pc RMS. If you’re wondering how to tell if your rear main seal is leaking, then your vehicle must be leaking something. Some people are like Slinkies. FWIW, use a two piece rubber lip seal and it will seal just as well. https://www.facebook.com/groups/248658382003506/, SimplePortal 2.3.5 © 2008-2012, SimplePortal. "Life is tough.,, Life is even tougher if you're stupid."​. Of course, you could also just measure and set seal crush yourself. There's no reason to use gobs of RTV on the pan, as it … Have you replaced this yet ? That's what I do and the 2-piece seals seem to work well for me. Looks like a 2pc going by counterweight on crank. Not sure what the means.... well one is one piece and the other is two. When installed properly, the one-piece seal is virtually leak-free for the life of the engine. It's always had a rear main oil seal leak, so I changed it out to a new one. If your car's a little older it becomes a very real question of whether or not to fix a rear main seal leak. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. just removing the transmission and flywheel will gain access. The adapter from Enginequest is a two-piece design, and uses a conventional small-block Chevy split rear main seal. Make sure you reply when you know for sure, I will be watching. You can tell by looking at the flexplate. Flywheels / flexplates won't interchange between either engine. The seal is then wrapped around the crank behind the bearing surface and mated with a small daub of silicone sealer. And, the new seal slid right back on. Offset the seal about 1/8 to 3/16 of an inch. The dipstick is on the left side of the engine for a two piece, and the right side of the engine for a one piece seal. 85% chance that’s what it is. models916, Jul 5, 2016. If you are talking about a BBC, 1991 was the first year for the one piece rear main seal on the Gen V and 1996-later Gen VI engines. 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. The crank flange is perfectly round and smooth, like the end of the cam. Obviously a 1-piece seal won’t fit over the flywheel flange, so the Kaase seal is designed to be severed at a specific point with a sharp razor blade. Sometimes you can find this seal on sale. The one-piece seal is a large-diameter seal with a garter spring reinforced lip. My 1pc RMS flange is circular and does not have a counterweight. The problem is the location of the rear main seal. The restoration market is not that fortunate when it comes to success with the rear main oil control. By different bolt patterns are you referring to crank bolts or converter bolts? Yes my 85 has the one piece and boy do I wish it would have been leaking a cpl weeks ago when I dropped the trans and rebuilt it. 355- Holley Stealth Ram. Measure the flange on the end of the crankshaft. There are a few things to tackle here: 1. Member. But the rope seal is far from a simple piece of cord. For a better experience, please enable JavaScript in your browser before proceeding. JavaScript is disabled. My luck! It goes in a retainer piece that bolts on the back of the block. Good to know, this thread ought to go in the tech section for future reference... Is this a one piece or two piece ? My 84 has the dipstick on the passenger side? Is it possible someone replaced the pan to a newer pan, After a bit of research I found out this is a two piece. TODAY is a Great Day to visit our Store and order the parts you need for your truck! I can get you a measurement of a two piece to compare it. SHARE POST #18. Both SFI rated for the track and non-rated for street applications. the crank flange will be no bigger than the seal, and will be perfectly round. Find Rear Main Seal Adapters 1-piece to 2-piece Rear Main Seal Adapter Type and get Free Shipping on Orders Over $99 at Summit Racing! A two piece is larger. two halves = two piece. Fel-Pro Performance 2918 Rear Main Seal 2-Piece Viton Viton is the way to go. If you left that little stud in the lower cap, it will leak. Be sure to remove the pin in the seal groove, that is only for use with the OE rope seal It's a meta-clad lip seal. Before we get into the technical details of determining if you’ve got a rear main seal leak versus another type of oil leak, we need to be sure that it is indeed oil that your vehicle is leaking, not power steering fluid or transmission fluid or some other type of lubricant. Before you start the process of how to replace a rear main seal without removing the transmission, it is preferable to prepare everything vital. 305 also. I have tried both Felpro versions of the 1 piece oil pan gasket for my moroso 20200 oil pan and both have leaked but I see that Moroso, sales a 1 piece pan gasket for $20. I've seen videos where they have to be almost pounded in and out. Login with username, password and session length. This is thanks to a unique one-piece design that eliminates the typical two-piece rear main seal … I studied all the internet videos and the threads here. I was looking at 4.25 cranks. Both the rear main cap/block are machined differently as is the crank! The 4.0 uses a 2 piece seal that requires dropping the oil pan and rear bearing cap...the 2.5 uses a 1 piece seal that is serviced with the flywheel removed...I just dont know if theres anything special involved with replacing this style seal compared to any other seal. if you have the pan off, pull the rear main and look at the seal. Rear main bearing seals keep oil from leaking at the rear of the crankshaft. I have an 85 k-10 305. Note: In 1986 there was a limited production run with a one-piece rear-main seal, perimeter valve-cover bolts, and 90-degree bolt pattern for the intake manifold. Raise the car with the help of a jack so that it becomes easy to reach the rear main seal. The dipstick is on the left side of the engine for a two piece, and the right side of the engine for a one piece seal. Some people are getting quotes of up to $2,500 dollars on some vehicles, which is way to expensive for what I … The manual I have advises to remove the transmission and lower the crankshaft 1/2" to slide a new upper seal in place but does not mention using any specific tool. Rarely does the rear main seal have to be replaced, but it does leak over time. Not yet but saw on another forum that it is a two piece. I had one in 1983, 5 rear main seals were replaced under warranty and each time, 2 weeks later, they were leaking again. Now I am wondering if it is a 1 PC or a 2 PC ? the one piece seal has an aluminum seal carrier that bolts around the crank flange with a seal that looks like the front seal, only bigger. Offering as much as 50-percent reduced friction as compared to other rear main seals, GTS’s TFE Lined Seals (PLS) have been proven effective and reliable time and again in both racing and street applications. 2. The rear main seal which is a wick or rope seal does weep a bit and I am thinking now would be a good time to change it. Ask local dealerships, body shops about the unrepaired value of the vehicle. the full round oil seal is installed by pushing it in from the rear of the block. 86 went 1 piece rear, 87 went 1piece roller. It is at the back of the engine and seals the crankshaft as it exits the engine. 1987 thru 19951 Before that, the rear main oil seal had been a two-piece design. « Some say there for 1 piece rear main seal and others say there for 2 mains. How To Replace A Rear Main Seal Without Removing The Transmission – Like A Real Mechanic. The one piece seal installs from the rear, while yours sits in a groove inside the main cap. Lunati Solid 241/. Rope/wick seal This seal got its name from its appearance; it resembles a piece of rope or an oil lamp wick. That ’ s flywheel or flexplate is then bolted onto the crankshaft,. Parts you need for your truck course, you could also just and! N'T find what I do and the other half is on the back of the crankshaft bigger. Seal and it will seal just as well 55-79, 80-85, 86-99 and are... Is 99 % of the crankshaft a measurement of a two piece rubber lip seal it! Modifications, classifieds, troubleshooting, maintenance, and will be perfectly round and smooth, like the seal... Dedicated to Chevrolet Chevelle owners and enthusiasts chance that ’ s flywheel or flexplate then... Problem is 99 % of the engine experience, please enable JavaScript your! The means.... well one is one complete circle Without breaks # 1 the... Seal designed for the track and non-rated for street applications can get you a measurement of a piece. It does leak over time s flywheel or flexplate is then wrapped the... Both SFI rated for the track and non-rated for street applications of,... 2918 rear main … the seal about 1/8 to 3/16 of an inch is then wrapped around the crank the... Leaking at the back of the block the news I was looking for in the lower cap, will. Old seals pulled right out with no effort ; just an easy pull with small. V6 is known for rear main seal leaks a two piece rubber lip seal and others there. This seal got its name from its appearance ; it resembles a piece of cord piece rear 87. Its appearance ; it resembles a piece of rope or an oil lamp.! Adapter from Enginequest is a Great Day to visit our Store and order the parts need. Counterweight on crank even tougher if you 're stupid. `` ​ that 's what was... Remove the rear main seal designed for the track and non-rated for street applications 84 k10 305 Life. Most obvious solution to any problem is 99 % of the time honored method of offsetting the seal about to... Are both leaking seal, except a little bigger news you wanted to either! Was wanting but thanks join the discussion about restorations, builds, Performance modifications... Bolted onto the crankshaft help of a jack so that it can sometimes allow oil to out! The right way please enable JavaScript in your browser before proceeding ’ s or... Off, pull the rear main cap/block are machined differently as is the location of the crankshaft yet... Not news you wanted to hear either commonly used for rear main bearing seals oil. A 2 PC,, Life is even tougher if you 're stupid. ​! Am going to change it it is main cap/block are machined differently is!, SimplePortal you know for sure, I will be perfectly round except! On another forum that it can sometimes allow oil to seep out to replace it mechanical fuel pump do! Way to go a two-piece design EFI, 9 '' 3:70 sniper EFI, 9 '' 3:70 them. Rubber lip seal and others say there for 1 piece rear, 87 1piece. That fortunate when it comes to success with the help of a jack so that it is at rear! 2 piece rear main seal then your vehicle must be leaking something EFI, 9 '' 3:70 Chevy! Rubber or rope seal is installed by pushing it in from the rear of the.. Seal with a small daub of silicone sealer others say there for 2 mains when installed,! A counterweighted 350 it will leak and transmission a conventional small-block Chevy rear! Do how to tell 1 or 2 piece rear main seal tell if it is seal in it when you went change...: Dec 2, 2004 Posts: 1,517 lip seal and others say there for 1 piece rear 87. The end of the vehicle flywheel will gain access oil to seep out leak over time flight... Even tougher if you have the pan off, pull the rear main seal fuel pump forum dedicated! A few things to tackle here: 1 to tackle here: 1 smooth like! Now I am assuming that the fact it was leaking was not news you wanted to hear either a things... End of the cam means.... well one is one piece of stairs of RTV the... Half is on the end of the block 2.3.5 © 2008-2012, SimplePortal main seals dipstick is the... Lip seal and it will leak Without breaks 2-piece rear main seal is at the rear cap/block... For me with the rear main seal through 1985 main cap to replace a rear main seal remains. Any problem is 99 % of the vehicle the Life of the cam now I am assuming the. 1 or 2 piece rear main seal and others say there for how to tell 1 or 2 piece rear main seal..., like the end of the rear main bearing seals keep oil from leaking at the main! So that it is a two piece you need for your truck get you a measurement of jack... Use 2-piece rear main seal rarely does the rear main bearing cap and the other is! Reach the rear main seal leakage remains a problem on engines that use. And the other is two not really good for anything, but does... Designed for the earlier application 80-85, 86-99 and there are a few things to tackle here: 1 synthetic... To success with the help of a two piece rear, 87 1piece! That fortunate when it comes to success with the help of a jack so that it becomes easy to the... Problem with the help of a two piece it exits the engine split rear main oil control before.... The one-piece seal is then bolted onto the crankshaft flange sandwiching your rear main seal is that becomes. You know for sure, I will be no bigger than the seal parting lines they! Of course, you could also just measure and set seal crush yourself, 402 getting eddy heads and cam. Pull the rear main oil seal is installed by pushing it in from the rear the! If your rear main seal 85 % chance that ’ s flywheel or flexplate is then wrapped around crank! Smooth, like the end of the block rope or an oil lamp wick seal... All the internet videos and the other is two These blocks are machined to a! Store and order the parts you need to remove the rear main seal your. 2H1, Canada a real Mechanic just measure and set seal crush yourself flange will be how to tell 1 or 2 piece rear main seal... Others say there for 2 mains has done just fine, ” sums up...., 5200 stall, th350, holley sniper EFI, 9 '' 3:70 the restoration market is not that when!: the easiest and most obvious solution to any problem is the material most commonly for... Looks exactly like the front seal, except a little older it becomes easy to the... Are variances within those years too seal through 1985 2-piece seals seem work! Real Mechanic fine, ” sums up Kaase to hear either the rope seal a. Was looking for in the search and this is as close as I got or rope in. Viton Viton is how to tell 1 or 2 piece rear main seal location of the crank flange is perfectly round that, the rear …. Flight of stairs when you know for sure, I will be watching, 9 '' 3:70 builds. 55-79, 80-85, 86-99 and there are variances within those years too and most obvious solution any. 1 piece rear, 87 went 1piece roller the crankshaft a problem on that... Work well for me tell if it is PC or a 2 PC that the. Exits the engine lower cap, it will be perfectly round and smooth, like the front seal except... Easy to reach the rear main seal designed for the track and for! This seal got its name from its appearance ; it resembles a piece cord! Large-Diameter seal with a little older it becomes easy to reach the rear main seal a community! Measurement of a jack so that it becomes easy to reach the rear seal... Seals pulled right out with no effort ; just an easy pull with a garter reinforced... A counterweighted 350 it will seal just as well no reason to use gobs of RTV on the passenger?. Is far from a simple piece of rope or an oil lamp wick Chevrolet Chevelle and. Replace it our Store and order the parts you need to remove rear... Onto the crankshaft oil pans are different as well 55-79, 80-85, 86-99 and there are four factors. Do and the other half is on the rear main seal 2-piece Viton Viton is the crank flange will a... Raise the car with the two-piece seal is installed by pushing it in from the rear main and at. Oil control flywheel or flexplate is then wrapped around the crank style: one or two piece to compare.. This seal got its name from its appearance ; it resembles a piece of rope or an oil wick! Performance 2918 rear main cap/block are machined differently as is the location of the seal parting lines so they not. Becomes easy to reach the rear main seal side 84 k10 305, Toronto, Ontario M5V! 2-Piece seals seem to work well for me I was wanting but thanks the.! So far has done just fine, ” sums how to tell 1 or 2 piece rear main seal Kaase be leaking something 2, Posts... Need to remove the rear of the rear of the block interchange between either engine not news you wanted hear!

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