lost compression on number two is it head gaskets valuse rocker arms ? no smoke coming out pipe

Asked by Mar 10, 2016 at 03:13 PM about the 2002 Chevrolet Blazer

Question type: Maintenance & Repair

4.3 vortec

1 Answer

71,415

You can check by pressurizing the cooling system for one, should hold pressure as long as everything else with the cooling system is good. So in number two, squirt some oil into the cylinder and check the compression. If the compression rises, then it would be the rings. If the compression does not rise, then a burnt valve. Also check the oil to see if the level is rising or looks milky, indicating a coolant leak, and check the coolant to see if oil has gotten into the system. Indications of a blown head gasket along with the pressure test.

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