Quote:
Originally Posted by konstan
#1 is shot as y'all say. What could have caused it? Well, the OIL ring on it was stuck and I had to break . I would speculate that it got stuck because of carbon, and then the piston got scored and it got even more stuck mechanically. What I mean by 'mechanically' is when I got the piston out, the ring groove was distorted enough to bind the ring in one please.
I doubt that this was the source of any kind of knock though. But still, good to fix.
Emery cloth - only to remove larger chunks of carbon. I will give paint stripper a try.
|
I have a piston from a smaller engine with the same markings. The oil control was broken and half missing, but the second compression ring was stuck.
I also think carbon build up is the answer. As the incredibly hot gases scorch all the oil that is allowed to gather on the sides of the piston and soot is added in, you end up with a big scouring pad.
I do think this could be the source of the knock, though. As the skirts are worn away, the piston is given clearance to wobble around more on the pin. This could definitely cause some piston slap... or the general term 'knock'.