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Tool Talk Discussion Forum

compression tester flaws

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Charles McNelly

12-29-2006 18:33:40




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I bought a compression tester and I can't seem to get a good read. My Farmall B and W-6 have the large spark plugs. When I screw the tester in all is fine, it tightens up and when I turn the motor over it blows the 0 ring out from around the stem of the tester. For some reason they didn't put a large enough retainer behind the O ring. I tried another brand of tester, same problem. Has anybody else have this problem?
Charles

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JT

12-30-2006 07:27:26




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 Re: compression tester flaws in reply to Charles McNelly III, 12-29-2006 18:33:40  
Never had that problem, just run a compression test on my H, should have the same size plugs as your B, no problems. Cheaper testers might have that problem due to the way the fittings are made.



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dan hill

12-30-2006 03:44:52




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 Re: compression tester flaws in reply to Charles McNelly III, 12-29-2006 18:33:40  
I use an old tester with a tapered rubber end.Some real bad oil pumpers will have good compression.



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msb

12-29-2006 20:48:04




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 Re: compression tester flaws in reply to Charles McNelly III, 12-29-2006 18:33:40  
Knock the center out of an old spark plug and the weld in a air connector male end. Be sure it is short enough so it will fit a deepwell socket.Attach a female chuck end to your compression gauge and you will have a good compression gauge.



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Charles (in GA)

12-30-2006 14:39:21




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 Re: compression tester flaws in reply to msb, 12-29-2006 20:48:04  
You can buy "air holds" that are like spark plug shells with 1/4 pipe thread in them to install air nipples. Used in conjunction with -on the engine- valve spring compressors for replacing seals. Quite easy and much easier than knocking out the innards of a spark plug (which is extremely difficult and time consuming, last time I tried)

Charles



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Bob

12-29-2006 20:41:53




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 Re: compression tester flaws in reply to Charles McNelly III, 12-29-2006 18:33:40  
Try an "O" ring with a thinner cross-section.

It will wedge into the threads better, and probably seal. It may get cut up, and have to be changed after checking a cylinder or two.

Or, if you have a friend with a lathe, have him cut a shallow groove in the gauge adapter for the "O" ring to sit part way down into.



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Wisconsin Cowman

12-29-2006 21:48:19




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 Re: compression tester flaws in reply to Bob, 12-29-2006 20:41:53  
Never had that happen before. It depends on much you paid for one. Like the 22.00 Wal-Mart ones are junk. Buy yourself a good one.



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