1992 4.9L Cylinder Sleeve O-Ring testing
Im working on my friends car. His complaint was car was losing coolant, and nothing showing up on the ground. Did leak down test and sytem loses pressure. Used a Napa block tester and tested positive for exhaust fumes in the radiator. Also a little oil is showing in the water.
So this looks like a tell tale sign of a head gasket/ head problem. But i read about these pesky cylinder sleeve o-rings.
My question is how to i test just these o rings once I get the heads off? just bolt a flat piece of steel with gasket material to the block and pressurize? Is there any other tricks? Or will i have to bolt the heads on with the new gaskets and do a leak down type test again?
thanks for reading,
appreciate all input,