Lazer

Has anyone ever seen cracked pistons before? I have at least two on right bank. I cannot seem to find similar issues in forums. When I shake the car the cracks wobble

Images are through spark plug holes.

theiceman

something doesnt make sense , are you down a spark plug hole ?? how could it wobble like that in the bore even if it was cracked ??? the video does not even look like a piston , that is so weird.

Lazer

yes I looked down two plug holes with same issue in each, 3rd looked OK

theiceman

id post that on pelican if you have not done so already, many engine builders there. I would love to know what they think.

Lazer

Problem resolved, after removing all plugs I found oil in 4 cylinders giving effect of cracked piston, image was shimmering under light of endoscope. Now I have to resolve why oil is pooling on top of pistons. All ive done is change oil, as there was only 1qtrt in it when I rescued the car from a garage after standing for many years. Why would it pool there?

theiceman

ah that makes sense ..

it is very common to pool on a flat 6. some guys after storage even go as far as take the plug out and crank the engine a few times in order not to hydrolock the engine..

the tank just gradually drains down , fills up the crankcase and leaks past the rings. not surprised at all if it has been in long term storage.

there is a check valve available to prevent this but i dont know the details.

redridge

that would be this https://www.pelicanparts.com/cgi-bin....cgi?pn=RS-30A

It prevents the oil going in the engine as it sits for long period of time. The oil pump pressure opens the check valve for oil to flow to the engine.

Lazer

Sounds a great idea I’m buying that tomorrow

theiceman

jesus though , 300.00 USD for check valve. !