Quote:
Originally Posted by Dave Neptune
The clearance on the valves should be around .012 so take a .020 and place it on top of the valve then turn the engine. This will give the valve a "nudge with direct force" which will begin to break it loose. If it still sticks go to .030 and repeat.
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Dave, at some point in the past I thought I understood this advice, but now I don't. Do you mean on top of the valve, or on top of the tappet? And if it's on top of the tappet, wouldn't the tappet rise up to fully contact the valve stem even without a feeler gauge there? I thought the only time there was a gap was when the tappet was in its lowest position, but it's not there for long when cranking. I'm sure I'm missing something.
EDIT: I'm now envisioning a scenario where the valve is stuck fully open. In that case, a feeler gauge would provide a little extra travel at the top of the tappet's upward stroke. Without the feeler, the tappet would just barely contact the valve but not move it. Is that what you're describing?