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By Nik Sutton - 12 Years Ago
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?I have replaced the rear main Seal ( two Piece) twice and it still is leaking a lot of oil. Anyone have advise on any things I might try to seal it up. Is there a trick to know while replacing that seal?
Nik
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By PF Arcand - 12 Years Ago
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Nik: There are definately right & wrong ways to install rear main seals. One place to get a good procedure is to link from here to Ted Eaton's site, where there is an extensive instruction page on rear seals. Also there are other places for leaks that may appear as main seal leaks. There is a Cam shaft plug at the rear of the engine that can also leak. It should be installed with sealer. However, Ted cautions when installing that plug, not to drive it in so it's tight against the cam, as doing so can cause damage to the spacer at the cam's front. Also the Valley cover gasket can be leaking at the rear or even a leak at the oil pump mounting area...
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By Nik Sutton - 12 Years Ago
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Thanks Paul I will give all that a try.I am new with these engines and need to learn the tricks.
Nik
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By Talkwrench - 12 Years Ago
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I did mine a while ago, damn sure I did everything correctly, followed Teds instructions to a T.. Nup still leaks the same.. Well they leak I'll live with it..
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By 312T85Bird - 12 Years Ago
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There are other areas that will leak and show up as a rear main leak. Did you check your cam freeze plug above the crank shaft to be sure that it is not leaking? Have you looked at the adapter seal for the spin on oil filter? These two culprits have gotten away clean for years because everybody automatically blame the rear main seal.
312T85Bird
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By Y block Billy - 12 Years Ago
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There is another area which bit me once driving a newly bought 55 from St Louis to Maine that happened in mid New York was somebody tightened the two center rear bolts on the oil pan which thread into the rear main seal too tight. The rear main is aluminum and goes into the pressurized oil area and when the threads are damaged in this area you will get a leak. Lucky for me as I was at a gas station checking it out and just as I found the culpret a gentleman informed me he had a good supply of nuts and bolts back at his farm not far away. I followed him over there and found a couple metric self tappers slightly larger, wound them in there and never had the problem again. that was the same motor I went to Columbus with in my 58 truck and those pan bolts were still in the rear seal area, never leaked a drop since.
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By Talkwrench - 12 Years Ago
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I'd like to know how you can check the cam plug, You'd have to pull the trans for that.. It could be a possiblity, My leak seems to start halfway up and between the block and trans...??
Good tip Billy..
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By oldcarmark - 12 Years Ago
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Talkwrench-I have the same problem with my rebuilt 292.I used the "Best" rear main seal and followed Ted's instructions.I have a leak after its shut off and sits.Doesn't seem to drip while its running.I am trying one of those "Stopleak" additives before I do anything more invasive.I have checked the oil filter adapter and its not coming from the valley cover as I fixed that so it will never leak.Drilled and tapped for machine screws.I am thinking maybe the rear camshaft plug also.Interested to hear some replies to that question.
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By Talkwrench - 12 Years Ago
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Yeah, Ive been all over this leaking business [ and the brakes issue] I just let it leak Pfft! Its hard sometimes when I visit friends I park out on the road and not in their driveway..Guess I could leave my mark ..
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By MoonShadow - 12 Years Ago
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I used the new neopreme seals on my last build. So far no leaks! I have to recommend them. They worked for me. Chuck
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By oldcarmark - 12 Years Ago
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Whats the "new neoprene seals"?Who makes them?What are the "Best" seals made of?
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By MoonShadow - 12 Years Ago
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John Mummert has them but Best Gasket also. They are a regular 2 piece seal like used in modern cars. I find them to be an excellent replacement for the old rope seals. Chuck
http://www.ford-y-block.com/gaskets.htm
http://www.summitracing.com/parts/fel-bs6141?seid=srese1&gclid=CP-KmYroy7cCFQuZ4Aod5zsAOw
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By Dobie Gillis - 12 Years Ago
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oldcarmark (6/5/2013)
Whats the "new neoprene seals"?Who makes them?What are the "Best" seals made of?
Neoprene lip seals that replace the old rope seals. You can get 'em at any auto parts store or antique car parts supplier. One part number fits any Y except the 312. The "Best" seals are made by Best Gasket. They are a rope seal but are made of Teflon fiber instead of the material most rope seals are made of these days.
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By Talkwrench - 12 Years Ago
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I used the Felpro neoprene that was in a full kit I bought.. Pfft! Y block sweat I call it!
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By MoonShadow - 12 Years Ago
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Old tyme mechanic once told me that Y-Blocks are like big dogs, They mark their spot for lesser breeds to see. Chuck
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By 312T85Bird - 12 Years Ago
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It definately is tougher if you have an automatic trans. but with a flashlight and mirror and some patience you should be able to see it.
312T85Bird
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By aussie57wag - 12 Years Ago
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I've used rope seals and never had an issue with leaking. the trick is to soak the rope in engine oil for a day or two then use your fingers to really work the oil in to the rope.
The use of additives will cause an issue with the oil filter gasket wether you use a spin on adaptor or not. the additive will swell and distort the gasket causing it to leak.
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By lowrider - 12 Years Ago
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aussie57wag (6/6/2013)
I've used rope seals and never had an issue with leaking. the trick is to soak the rope in engine oil for a day or two then use your fingers to really work the oil in to the rope.
The use of additives will cause an issue with the oil filter gasket wether you use a spin on adaptor or not. the additive will swell and distort the gasket causing it to leak. Years ago my dad said they used to keep rope seals sitting in oil all the time because they were replacing them so often. All the cars he worked on then were family cars & daily drivers so they were pretty beat up by the time they came in. He said most of the time it wasn't really the seal that was bad but that the crankshaft was worn too bad. Watched him gather up all the wax paper from the guys lunch buckets & miking them to get the thickness he was looking for to "shim" up the rear main bearing to get a tighter fit on the rear bearing.
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By kansas - 12 Years Ago
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I had a small rear main leak on my 55 when I got it/replace the road draft tube sys with a pvc sys and hasn't leak a drop send then that was 3 years ago
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