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Search took 0.00 seconds. Search: Posts Made By: 100IH
Forum: Model A (1928-31) 12-02-2016, 06:32 PM
Replies: 17
Views: 3,334
Posted By 100IH
Re: #4 cylinder misfiring. Spark good. Compression 53 psi

Mitch, That's the idea. Just another way to collect data that's hard to find.
Forum: Model A (1928-31) 12-02-2016, 02:28 PM
Replies: 17
Views: 3,334
Posted By 100IH
Re: #4 cylinder misfiring. Spark good. Compression 53 psi

It is simply a check for an intermittent valve that is not sealing. Frequently, a conventional compression test might not show an open valve at cranking speed if the issue is marginally sticking...
Forum: Model A (1928-31) 11-30-2016, 01:30 PM
Replies: 17
Views: 3,334
Posted By 100IH
Re: #4 cylinder misfiring. Spark good. Compression 53 psi

When you suspect that there is a valve sticking, after everything is back together,
you can test compression with the schrader removed from the threaded end of the hose. The needle will jump up and...
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