[s-cars] front crank seal (aka crankshaft seal, main seal)
audi at humanspeakers.com
Thu Mar 29 13:47:15 EDT 2007
> My experience with the front crank seals after having removed and replaced
> several is that even at 150K miles they typically show no wear and actually
> look new. IMO there may be as much risk in replacing one, especially if you
> don't pull the carrier - in this case the pump, than if you just leave it
> alone. If it isn't leaking a drop and the area is indeed bone dry, you are
> likely good for another belt change.
> I'd appreciate any feedback even if to the contrary - I certainly don't like
> to do jobs twice.
I do have an opinion or two about this... first, the reason we
"routinely" replace that crank seal when doing the TB/WP job is that
it's an eight dollar part that takes several hours of labor to get to -
and while all these parts are off, it's easy to get to.
That said, what you are saying makes some sense - the tough part for the
amateur (at least) is deciding if that seal is good for another 60k
miles/5 years or not. So I would suggest that on any "unknown" engine,
ie, the first tiem you DIY the job, you should replace the seal. On a
"known" engine, ie, one you did 60k ago yourself, perhaps leaving it
alone would make sense. I know I sure wouldn't want to have to replace
one "between" TB changes.
What is the "expected" lifespan of that seal? I know that years ago I
had to have the cam seal replaced on my coupe (at 150-200k or so). I
suspect failure is a bit random, but I might be wrong.
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