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Re: Compression on an H
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Posted by Wayne Swenson on February 16, 2004 at 20:48:39 from (66.228.233.214):
In Reply to: Compression on an H posted by Andy in Ohio on February 16, 2004 at 19:14:28:
I have been fooled by a faulty tester on occasion; the Schrader valve core from a tire was put in the tester instead of the correct valve core from the tester manufacturer. The tire valve core had a stiffer spring and gave consistant, but low readings.
Next, be sure you have all spark plugs removed, carburetor in the wide open throttle position, fully charged battery, and ignition turned off.
Test all cylinders for readings on the 1st and 4th compression stroke. Now squirt motor oil in all cylinders and re-test. The readings should be a little higher(10# or so). A larger change indicates bad rings(25# or more). All cylinders should read within 10-15% of the highest reading.
The "Cadillac" test proceedure is to do a cylinder leak-down test. It will pinpoint exactly where and how much each cylinder leaks.
Automotive supply stores have that tester available.
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