Step one: use a cheap compression tester. Take out the spark plugs and
disconnect the coil.
do a compression test of all six. The numbers should be within ten psi.
Step two; Squirt a little oil into each spark plug hole and test all six
again.
Keep both sets of numbers both wet test and dry test. If the wet test is
a lot higher than the dry test, the rings are bad.
Step three: (if number one is more than ten psi off from the others) get a
tool from the autoparts store for changing valve stem seals. It connects
to your air compressor and screws into the spark plug hole. Start pumping
air into #1 and FIND THAT AIR! You could have bubbles in the coolent, air
in the crank case, or in my case a breeze comming out the exhaust pipe!
Take a look at http://www.umsl.edu/~itcbborg/valve.htm to see what a badly
burnt exhaust valve looks like.
The test take about an hour and the tools are cheap.
>From: "Paul J. Burr" <tigerpb@ids.net>
>1.) How does one diagnose a burnt exhaust valve without taking the head off.
>This guys mechanic didn't, so I wondering if this is the source of the
>problem.
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E-MAIL ADDRESS: borgstede@umsl.edu
Brian Borgstede I
Telecommunications Engineer, I '68 Triumph
University of Missouri, St. Louis I
Instructional Technology Center I TR-250
Phone: (314) 516-6433 I (or 2 or more)
Fax: (314) 516-5294 I
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