View single post by Mark Rosenbaum
 Posted: 06-30-2005 06:21 pm
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Mark Rosenbaum



Joined: 03-12-2005
Location: Kingman, Arizona USA
Posts: 532
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 If you had good compression on all four cylinders before the belt change, then yes, the valves most likely are bent.  This can be proven or disproven if you set a suspect cylinder to the top of its compression stroke, fill it with compressed air, and listen for any faint hints of air leaking out the intake or exhaust.  If you have a leak at either, or both, then some or all of the valves in that cylinder are not sealing.  The only cure is to remove the head and replace whatever has gone bad.

OTOH, if you hear air coming only from the crank case, then the rings are leaking.  Here, you may have worn liners and/or worn piston rings, or perhaps the rings just stopped sealing due to irregularities in the bore.  The former requires pulling the engine and performing a partial overhaul, while the latter generally requires about 200 miles of driving to re-seat the rings.