On Tue, 3 Nov 1998, Cliff Pike wrote:
> ...An ex-military diesel mechanic friend tells me that a proper
> compression test is done in two stages: 'dry' and 'wet'. The dry test is
> done before adding oil to the cylinders, Record the numbers, then add
> oil and test again. According to him, if the numbers are fairly
> consistent during both tests then the engine is in good shape. If the
> 'wet' test indicates higher numbers, then there could be a problem.
> Anybody like to comment?
That makes sense, in a way. If numbers are on the low side but rise to or
near "spec" with the oil in the cylinders, that's a reasonably good sign
that rings are worn. However, if the initial dry test yields numbers at
or close to "spec," then it might not be necessary to do the wet test?
--Andy
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* 10/Herald/Vitesse (Sports 6) Consultant *
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