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post #1 of (permalink) Old 01-21-2003, 09:48 AM
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Front Main seal leaks, Help

Hi All,
I Have a small/big problem. whenever I drive the front main seal on my 360 blows oil everywhere. this started happening after I changed the water pump. since then I have replace the front main seal in the timing chain cover.
The strange thing is that it does not leak when it just idles(Cold or Hot), it only leaks after it been driven.

Does anyone have any ides as to what the problem is?

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post #2 of (permalink) Old 01-21-2003, 10:50 AM
 
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Re: Front Main seal leaks, Help

I am confused - did you or did you not change the oil seal in timing cover?

If replaced -
did you put it in backwards? (sorry have to ask) Seal should be oriented so oil pressure forces the seal lip against the rotating shaft
was the seal surface on the balancer gooved? if yes - did you use a sleeve to repair?
were you extra careful not to damage the seal lip when installing the seal and the balancer?

Oil pressure rises (to max) as engine rpm increases. Likely oil pressure at idle is not enough to overcome the seal.

if your engine is high mile, it is possible that excess combustion blow-by causes too much crankcase pressure. Is PCV functional? Is crankcase breather clogged? If you remove the oil filler does steam blow out? ...more when the engine revs?


Can you see oil leaking from the front seal if you hold the throttle to increase rpm?
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post #3 of (permalink) Old 01-21-2003, 11:20 AM
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Re: Front Main seal leaks, Help

Thanks Trailisman for the response

I am confused - did you or did you not change the oil seal in timing cover?

-Sorry, yes i did change it.

If replaced -
Did you put it in backwards? (Sorry have to ask) Seal should be oriented so oil pressure forces the seal lip against the rotating shaft

- No, it is in correctly, the side with the spring is on the inside (same way it came out)


Was the seal surface on the balancer grooved? If yes - did you use a sleeve to repair?

-The balancer was not grooved

Were you extra careful not to damage the seal lip when installing the seal and the balancer?

-As far as I can tell nothing was damaged putting the balancer back on


if your engine is high mile, it is possible that excess combustion blow-by causes too much crankcase pressure. Is PCV functional?
-I believe so; it was replaced about 6 months ago

Is crankcase breather clogged?
-I do not know, i will check this

If you remove the oil filler does steam blow out? ...more when the engine revs?

-Not really, the steam kind of floats out, not with any noticeable pressure


Can you see oil leaking from the front seal if you hold the throttle to increase rpm?

- I have tried this(not knowing what RMP im at since I donít have a Tech.)and have not seen any oil leaking out, it only seems to do this after a load is put on the engine
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post #4 of (permalink) Old 01-22-2003, 09:07 PM
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Re: Front Main seal leaks, Help

Are you sure its the main seal leaking and not the oil presure sending unit near the oil filter? They are very prone to getting little cracks and leaking under pressure from what I have seen. Just a thought...Good luck!
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post #5 of (permalink) Old 01-23-2003, 11:23 AM
 
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Re: Front Main seal leaks, Help

Well, shoot.... that is most of the simple causes I can think of quickly.

Only other is source -- but dfjeepster already said that.

Can you be 100% that the front seal is source?


Maybe if not 100%, clean everything and drive just a bit - then look.

good luck... [img]images/graemlins/grin.gif[/img]
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