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FSM Compression testing

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Mark Myers

01-20-2002 10:52:54




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What is the correct procedure for testing the compression on a '63 FSM? Yesterday, I had my brother-in-law over, so we went out to play.

We pulled the injectors one at a time, and with a rubber tipped compression testing gauge, checked the compression. My problem is, the amount of compression recorded seemed to be dependent on how long we cranked the engine! I think the compression should read 275-300 psi, but what should the duration of the test period be?? 5 sec, 10 sec, ??? It also seems reasonable to take multiple readings (say 3) and then average them....or am I over working myself??

From the readings I recieved yesterday, it is time for a top end on this engine....but I want to be sure before I start tearing it down!!

Thanks
Mark
Texas

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Bill S.

01-20-2002 17:17:57




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 Re: FSM Compression testing in reply to Mark Myers, 01-20-2002 10:52:54  
Normally an adapter secures in place of injectors. Then the gauge is connected to that. I would worry that the volume of the chamber beneath your rubber tip gauge effectively reduces the compression ratio during the test. Consequently readings would be low. I'd be interested also to hear what others say of how long to crank. I usually go several turns and try to do the same for all cylinders. I guess that didn't answer your question very well, sorry. Were the readings consistent between cylinders? Bill S.

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Don Young

01-20-2002 20:33:01




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 Re: Re: FSM Compression testing in reply to Bill S., 01-20-2002 17:17:57  
For compression testing, engine should be near operating temperature and cranking should continue until the gage stops rising if the readings are to be compared to factory values. I agree that on a diesel the extra volume of the injector cavity would reduce the pressure, but I have no experience as to how much.



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