Re: engine trouble???

Posted by Les on May 22, 2001 at 12:16:44 from (206.155.220.71):

In Reply to: engine trouble??? posted by SMTA Man on May 21, 2001 at 20:29:03:

Perhaps you can get access to a deferential pressure gauge. This tool allows you supply a known pressure from a compressor to the cylinder which is displayed on one gauge a second gauge measures the difference between input pressure (80 PSI for aircraft engines) and the pressure that the cylinder is capable of maintaining. The difference between input and cylinder pressure allows you to compare the cylinders. On aircraft engines the allowable difference is most often 20 PSI maximum with an average diffence of 10PSI for all cylinders.
This test requires that the piston in the cylinder being checked be at TDC. A TDC indicator is handy. Any pressure being lost will be past the piston rings or valve seats,or. You will be able to hear which direction escaping air is going.
Sorry for the lengthy post.
Les

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