On a leak down the PSI isnt' really all that important, you are really
just looking for the percentage of leakage, ie, if you put in say 50 psi
(w/piston at TDC so it doesn't turn the motor and the valves stay shut),
and lose 2.5 psi you are losing 5%, 100 psi is the easiest, I use that on
modern motor cycle engines, but I dont' know if that is a safe pressure
for these older motors. I assume it should be fine.
-alfie
On Wed, 23 Jan 2002, Dana Muise wrote:
> Hey truckers
> I did a compression check on my old 235 last week and all 6 cylinders came in
> about 10 lbs below the minimum. The manual said to put a little oil into the
> cylinders and try it again. They all checked great after that. People are
> telling me this indicated worn rings. Does any one have any theory on this?
>
> I'm going to perform a leak-down check this week-end. I'm told you have to
> listen at the tail pipe or intake for hissing (bad valves) or oil breather for
> bad rings. Is this right? It doesn't seem very accurate. Does anyone know what
> the PSI range is for this check?
> Thanks for you help!
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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