hi again
i was trying to do a leak down test for the past few weeks, but with no luck. i found someone with a compression gauge, he tested but all he said that it is low, i could not get a number out of him. and my engine "mysteriously" broke his gauge. so i thought he did not know what he was doing, beside he did the test some how incomplete.
so i decided to open up and see what is going inside, and i was going to change the head gasket anyway. the head gasket was slightly broken between cylinder 4 and a nearby water hole. but nothing else is wrong with the gasket. the cylinder walls all seam shiny and clean. but i don't know what to look for exactly. if i am going to inspect the valves, cylinders, etc., what i should be looking for?? what are the good and bad signs??
what i can see now is a thin layer of carbon on the piston crown, and also on the very top of the cylinder wall, about 3mm wide.
thanks guys for the help
ps: in the last week, the knocking is some how less, it stops knocking when the rpm is above 1000, some times on less rpm (previously it used to knock up to a 1800 rpm), but the engine is wobbling hard and i can feel it in the steering wheel when the engine is idling. i can't use the AC too, it becomes heavy to drive and when the engine temp reaches 95 i can't stop and move again with the AC on, the engine knocks hard and stops rotating. i turn off the AC, and start and it works :-/
....all mechanics who suggested a failed valve said they have to open the cylinder head and take a look....seams more damage than fix to me!!!
