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Discussion Starter · #1 ·
Hey I have low compression and My car needs avalve job and one of my plugs fouls real often. Is it the rings that are bad or is it the rings??

Dustin
 

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> Hey I have low compression and My car needs
> avalve job and one of my plugs fouls real
> often. Is it the rings that are bad or is it
> the rings??

> Dustin
Dustin:do a dry compression ck.first on all cylinders, then do a wet test next by putting a little oil in the cylinder first then checking compression. If compression rises dramaticly your rings are worn, now if it does'nt then you need some valve work.If your engine has a lot of mileage on it you should just overhaul it
 

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Discussion Starter · #3 ·
I did that a few weeks back and the compression only went up about 10 psi at most so are my rings worn or my valves??

Dustin
 

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> I did that a few weeks back and the
> compression only went up about 10 psi at
> most so are my rings worn or my valves??

> Dustin

if the wet test is not much greater (25 psi or more) that the dry test, it indicates valve leakage, or if two adjacent cylinders are low and wet and dry readings are close, it may be the head gasket. you should also be sure your valve clearances are correct.
 

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Re: do both, you'll only have to do it later

> if the wet test is not much greater (25 psi
> or more) that the dry test, it indicates
> valve leakage, or if two adjacent cylinders
> are low and wet and dry readings are close,
> it may be the head gasket. you should also
> be sure your valve clearances are correct.

I it was been my experience that if you give a worn engine a valve job, it will cause blow-by past the rings. And vice-versa
JN
 
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