Re: [Amc-list] 66 Ambo still working on compression problem

[Tom Jennings <tomj@xxxxxxx>]

On Wed, 2007-06-13 at 14:42 -0700, Raymon Hacking wrote:
> Dave...thanx for the input...can you tell me how to figure out if some
> valves are stuck slightly open?  

There's essentially no way that stuck rings will cause sudden zero
compression. I think you said there was compression before, or it ran on
all cylinders. Even if all the compression rings magically broke there
would be SOME compression.

Any open valve will instantly make zero compression.

Your empty gas tank probably means that the gas all evaporated. It will
leave a nasty byproduct behind. Upon putting new gas in from a can, that
old crap dissolved. It burns, but leaves large amounts of sticky crap on
the valve stems as the gasoline lands on the valve stems. This hardens
into viscous goo when the engine is hot from running. When the engine
cools off, valves left in a partially-open position are glued in place!
Valves that are closed when the motor is turned off are glued in place
too, and when you later crank the cold engine, the valve won't open, and
the pushrod bends.

You won't have any external sound or indication if a pushrod bends; it
falls to one side. The only symptom will be a misfire.

It's easy to check for stuck valves -- take off the valve cover, pull
the coil wire off, and crank the engine. You should see all the valve
rockers move. Simple. Pushrods should be in place.

If you crank it for 5, 10, 20 seconds you should see oil delivered to
the rockers etc.


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