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04-19-2003, 01:00 PM
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#1 |
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Registered User
Join Date: Jan 2002
Location: North Carolina
Posts: 692
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compression test ????
Hi all before I decide whether to just do head work or not I want to do a compression test. Can someone tell me where to look up what my compression is supposed to be. The truck set up for almost a year and smokes pretty bad. It also is getting gas in the oil, is it possible that the fuel pump is causing that?
Anyways I just wanna see if the rings are good before I start working on it and find that later TIA Steve
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2008 Buick Enclave(wifes new non wrecked) 1996 Jeep Cherokee 2002 2500HD 6.0L (traded) 1998 Jeep Grand Cherokee(wifes/wrecked) 1977 DJ5 postal jeep(mmm lots of fun) 1988 Toyota 2wd p/u(DD, blewup 199,000) 1991 Toyota 2ed p/u (sry just cant break these things) 1997 XR70 Honda 1991 Z50(FOR SALE) 1972 Z50 Honda 1970 SWB 350/knucklebuster "The adventure begins and I am confident that there will be no end". |
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04-19-2003, 01:24 PM
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#2 |
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Recovering Truck Driver
Join Date: Mar 2002
Location: Orleans, NE USA
Posts: 1,883
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It seems like optimal compression is 120 psi on every cylinder. More of what you are looking for is even comp. on all cylinders. if it's got some that only read like 40 psi, and some that read 100 psi, you need to rebuild. The gas in the oil could come from the carb running too rich, or a leaky fuel pump.
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska |
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04-19-2003, 03:15 PM
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#3 |
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Registered User
Join Date: Dec 2002
Location: Canada
Posts: 695
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A leakdown test is considered more accurate and should make it easier to determine what the problem is if there is one. ie - air leaking from the exhaust might be burned exhaust valve etc The cost of a leakdown tester is a bit higher but not outrageous - plus you need a compressor or access to one
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1968 Chevy - 292 with a powerglide |
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04-19-2003, 06:20 PM
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#4 |
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Registered User
Join Date: Jan 2002
Location: North Carolina
Posts: 692
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Thanks guys I will look into the leak down tester, I just wanna know what I have before I start tuning everything and then find Ive got shot rings. The truck really runs rough right now but its a whole lot better than not running LOL. I want to find the source of the smoke before I mess around and screw it up worse
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2008 Buick Enclave(wifes new non wrecked) 1996 Jeep Cherokee 2002 2500HD 6.0L (traded) 1998 Jeep Grand Cherokee(wifes/wrecked) 1977 DJ5 postal jeep(mmm lots of fun) 1988 Toyota 2wd p/u(DD, blewup 199,000) 1991 Toyota 2ed p/u (sry just cant break these things) 1997 XR70 Honda 1991 Z50(FOR SALE) 1972 Z50 Honda 1970 SWB 350/knucklebuster "The adventure begins and I am confident that there will be no end". |
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04-19-2003, 06:32 PM
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#5 |
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Registered User
Join Date: Jan 2001
Location: Killingworth, CT. USA
Posts: 3,378
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Pull all six or eight spark plugs, disconnect coil wire, take a dry compression reading on all cylinders, record findings, squirt 1oz of motor oil (wet test) in each cylinder and retest, record readings. As stated above your looking for the cylinders to be within 10% of each other. If you find a cylinder is much lower than the others on the dry test, and it does not increase with the wet test, chances are it's a valve problem, if it increases with the wet test, it's probably rings.
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1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist. |
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