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Fred Rawling

my vacuum gauge reads 17 when cold but drops to 8 it warms up

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I know that a steady 8 late means late valve timing.  What I do not understand is why it changes when the engine warms up.

 

This is a 1928 engine with timing gears and no chain.

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Could the valves be tightening up enough to leak? I would expect them to loosen with heat on an overhead valve engine, but it doesn't always turn out that way.

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