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> Is it valves or rings ?
jsteele22
post Sep 29 2005, 04:12 PM
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My '76 2.0L is putting out a little smoke on hard acceleration. Is there a way to tell if the oil is leaking past valves vs. piston rings ? The old trick I always heard was to test compression, put a little oil in the spark plug hole, and retest. But that won't work on a horizontal cylinder.

My hunch is that it's the valves, but only because its easier for someone (PO, not me !!!) to screw them up by not doing regular valve adjustments. My records are a little patchy, but I think the engine was rebuilt less than 50k mi. ago. Any consensus on what tends to go sooner ?

Thx
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Sammy
post Sep 29 2005, 08:49 PM
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If you have it on TDC it can't leak past the guides.
Both valves would be closed.
Leakdown will tell you if you have bad rings or bad valves, but not valve guides.
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Posts in this topic
jsteele22   Is it valves or rings ?   Sep 29 2005, 04:12 PM
lapuwali   Not valves, but valve guides (which have nothing t...   Sep 29 2005, 04:29 PM
Jake Raby   Never recommend a top end only rebuild... The eng...   Sep 29 2005, 04:33 PM
billd   The usual way do diagnose a compression problem is...   Sep 29 2005, 06:56 PM
Sammy   If you have it on TDC it can't leak past the g...   Sep 29 2005, 08:49 PM
lapuwali   Yes. The only way to tell if you have bad guides ...   Sep 29 2005, 10:49 PM
Brett W   Bad valve guides will show up on start up. If you...   Sep 29 2005, 11:43 PM
jsteele22   Wow, You folks have chops. I never knew why...   Sep 30 2005, 10:07 AM
BMartin914   Get it waived. Adjust your valves, buy a couple ca...   Sep 30 2005, 12:57 PM
jsteele22  
 

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