Hay Ya'll  was under 95 today wiping down and there is a frt engine leak, from harmonic bal seal or ???  could not tell. Any history of leaks and how to fix in car?

No real "problem" areas for oil leaks...sometimes the oil just wants to be on the other side....
I would suggest cleaning the area well, and try to determine where the leak is coming from. The front seal can leak, as could the front area of the oil pan, where it wraps around the timing cover. Could also be a leak higher up(intake) that is wicking down.....


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Joel Adams  
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Thanks for the insight.  Have looked and top of engine is ok down to the lower eadge of the water pump.  Can the harmonic bal be pulled in the car??

It's close quarters, but yes.

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--  Mark

Late models have a tendency towards timing cover leakage.  Unless is leaking bad,  I'd live with it, as you have to pull so much stuff to fix it.  Now if you plan on doing things like a cam change, timing chain swap, etc., then is the time to fix it since you have to take it off anyway.  Just my opinion.

the lt1 for 95 has 3 seals on the timing cover,one for the water pump drive,one for the opti spark drive and one for the crank shaft,also the cover gasket and the oil pan gasket is one piece and the timing cover doesn't have a separate oil pan seal.opti spark seals are becoming common.have to remove everything to get to these seals,so if you do it,do all of them.if its a gasket leak,well be careful not damage to oil pan seal under the timing cover,or its an oil pan seal change.if you buy the timning cover gasket set,all seals are included,good luck.TLaVac

Can the oil pan gasket be changed with the motor in the vehicle?  I have a 1986 C4 and it looks possible, but I know you have to be able to pull the pan straight down first to clear the crankshaft.  Looks like a major job, looks like you have to remove the starter and some smog lines too.  How long did it take you to change the pan gasket?  I have access to a lift so that should make the job a bit easier, but always good to get the details from someone who has done it before.


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1986 "Bright Red" COUPE - Aluminum Heads,
Sport Seats, Bose, Ultra-Flo Exhaust,
Automatic, Bilsteins - "Mostly Original" otherwise.

One more possibility is the crank position sensor seal on the right side of the timing chain cover. It's an oblong weatherpack type, ribbed seal, remove the single bolt and it pulls out easily but both are a challenge to get to. A lot easier if you remove the right side engine mount bolt and lift the engine away from the cross member. Once out, easy enough to clean the silicone seal before then the fight to get the bolt started.

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