Question about Buick Regal
When you say a vacuum test indicated a worn valve guide, was there a slight rapid vacuum gage needle fluctuation at idle?? a worn valve guide as a rule only causes oil consumption,( not a rough idle), and on only one cylinder, which would be very little oil burned, I have allot of time working on the GM 3.8L V6 I have never heard of this issue related to the valve cover gasket being changed, as a technician with 30+ years in dealers I flat don't think they are related, have you checked the power balance on the engine?? Run a power balance and a compression test? then you have the whole picture, after that the appropriate repair will most likely be to pull the head.one last thing though, have you sprayed the intake with carb spray to verify no intake leaks?? Another thing how would dirt find it's way to the intake system from a VC gasket change? it would go to the crankcase oil pan.
Posted on Aug 03, 2008
Anything could have caused that, it is unfortunate! I have that engine on my Bonnieville, and it is a great one!
Please check any other possible cause first!
You should note that the 3800 engine uses integral valve guides. IE; they are a part of the cylinder head and cannot be replaced. They can be reamed oversize if they are found to be worn past the appropriate limits. Sometimes, the valve guide bore will be oversized as manufactured. This will be marked on the inboard side of the cylinder head on the surface just above the intake manifold.
This could be fixed by reaming and replacing the guide with oversized stems.
If you need more info let us know!
Posted on Aug 03, 2008
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Posted on Jan 02, 2017
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