Re: Low Compression on Cylinder 4

Posted by Owen_Dyneto On 2019/11/25 12:58:49

I'm assuming you have a 282 engine; make sure you have some valve lifter clearance on both valves. In other words, just make sure lifter adjustment isn't keeping a valve from closing completely.

That an adjacent cylinder doesn't also have low compression suggests (but doesn't prove) that it's a valve problem and not a headgasket issue. You could pressurize the cylinder with compressed air and listen carefully to identify where the loss is coming from.