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TheMike 11-19-2001, 01:34 PM I measured compression on my 86 2f and here is what i got (1) 140, 170, 145, 120, 120, 125 (6) can anyone tell me why i have such a big difference on first 3? thanks DonM 11-20-2001, 07:54 AM Those are unusual readings, especially the 170 on #2. Did you take these readings more than once? TheMike 11-20-2001, 07:20 PM Originally posted by DonM Those are unusual readings, especially the 170 on #2. Did you take these readings more than once? i did it once i think i should do it again Shawn 11-20-2001, 07:42 PM Yes do it again,,, Don't let the motor start. TheMike 11-20-2001, 08:05 PM Originally posted by Shawn Yes do it again,,, Don't let the motor start. how will the motor start if all the spark plugs r out is thats how im suposed to do that? with plugs out? correct me if im wrong Shawn 11-20-2001, 08:08 PM No,,, that's fine, so time people just pull one plug and crank it over, if the motor starts in will give you a falts reading. With all the plugs out, it just allows the motor to turn over faster and with ease. bludog 11-20-2001, 09:19 PM Remove all spark plugs. Make sure the throttle is fully open, do this once and lock it so fuel does not wash the cylinder walls. Engine should be hot and make sure you do even amounts of compressions per cylinder, about 10 should be good. Too high compression = carbon build up and poss oil burning(wet cylinder), average to low = worn comp rings and poss leaking valves. very low = burnt valve or head gasket failure. ranger 11-21-2001, 07:33 AM Those are some strange readings! When you do your second compression test and some of the cylinders are still low, squirt some oil into the spark plug hole, and check the compression again. If the compression raises considerably, your rings are shot. If the compression stays the same, dosen't rise(that is after you squirt the oil into the cylinder), you have a bad head gasket or leaky valves. Don't get carried away with the oil, just a squirt or two from a oiler is suffice. :skull: | |