REAR SEAL LEAK TREATMENT

danzangus · Aug 2, 2020

STILL HAVING TROUBLE WITH THE D 17 REAR SEAL LEAKING.NEVER HAD MUCH FAITH IN TREATMENTS FOR THIS PROBLEM.MY QUESTION IS,HAS ANYONE HAD ANY SUCCESS WITH BARS LEAK,BLUE DEVIL OR ANY OTHER OIL TREATMENT?

TJ in KY · Aug 2, 2020

I had luck on a front timing cover seal with a Lucas
Oil product, Engine Oil Stop Leak. Not specifically
made for rear mains but worked on a stubborn
timing cover leak on a Chevy van.

J Hamilton · Aug 2, 2020

If it's a small leak those products may
help for a while but in the end a seal
replacement will have to happen

JIM MN · Aug 2, 2020

If the seal is a rubber or what lip type seal, a product like Lucas that has a-- oil stop leak-- has a
additive in it that will soften and swell-up the lip style seal making it seal tight again for an extended
period of time.. The additive does work..

Hobo,NC · Aug 2, 2020

Once in a blue moon I have seen it help/work...

old · Aug 2, 2020

I used something like that one time and never again. It ended up costing me big $$ due to it sealing the oil pump relief valve so the engine had to be pulled out and the oil pump rebuilt

derwen1959 · Aug 2, 2020

What I say now is truth ...
I have dexta which leaked from rear crank seal and
Used multigrade to top up until one day the drum
was empty and the only oil available was
Fuchs HDX30 which I keep for sawbench engine
So I topped it up with HDX30 and the leak stopped
I would never put oil additive in my engines
Is engine breather clear?

Steve@Advance · Aug 2, 2020

It depends on why it's leaking and what type seal it is.

Often a leaking rear main is a symptom of a more serious problem, as in loose main bearings. Add to that worn rings causing the crankcase to pressurize, and push oil out the rear seal or anywhere else it can get out.

It can also be caused by improper installation, especially if it is a rope seal. They are very prone to leak if proper and detailed procedures are not used on installation.

Oil stop leak products work by softening and swelling age hardened rubber seals. That is the extent of their ability.

If it is a rope seal, don't expect any benefit. If it is a new rubber seal that is leaking because of improper installation, or oil is coming under the rear main cap, or the pan gasket, no, it will not help.

But one thing I have found that does help, in most cases, and it must be done with caution, is to run the oil level a quart low. And double check that the dip stick is correct, if it's wrong, or the tube is not fully seated, running too much oil can cause one to leak.

tomNE · Aug 2, 2020

I agree with all above. Only thing different but it's really not different is putting some brake fluid in. but all that does is swell the seals!

Absent Minded Farmer · Aug 2, 2020

All that info is good food for thought. My 806 just started leaking from the rear main a week ago. I had suspected the knock coming from the low end of cyl. 2 may have something to do with it. Wonder if the mains aren't getting ovaled out from the strain?

Mike

REAR SEAL LEAK TREATMENT

danzangus

Member

TJ in KY

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J Hamilton

Well-known Member

JIM MN

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Hobo,NC

Well-known Member

old

Well-known Member

derwen1959

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Steve@Advance

Well-known Member

tomNE

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Absent Minded Farmer

Well-known Member

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