Re: Compression check for 79 Jeep 304v8
Nice photo & layout. Very professional. At first glance 6 & 7 look like your oil issue (only if that's an oily deposit), but this is not definitive. I don't think your compression numbers are pointing to anything specific. I would want more info. For example: what's the rate of consumption? (quarts of oil per miles driven) when is it blowing smoke (what color)? If you have blue smoke on hard acceleration - that indicates rings, where as if it only smokes when you let off the throttle after smokeless acceleration - that indicates valve guide seals. If it gives you a puff of blue smoke just at start up (first few seconds) that would indicate oil build up in the valve cover seeping past the valve guide after shut down (plugged drain passages). On the other hand if it smokes heavy blue like a mosquito fogger on start up that clears after the engine reaches 200f coolant temp for a few minutes - that indicates worn pistons that snug up after they warm up (collapsed or scuffed skirts maybe). If your smoke is white/white-ish, that's water (could be condensation in the muffler/pipes). If it smells sickly sweet also, that's coolant (look at 2, 4 or 8). 304's were pretty stout engines, but wear & tear or poor storage could cause any of these issues. Take a short video and post it on youtube - give us a link.