Mechanics

MODELS BAD KNOCK

1978 GMC Other

Engine Mechanical problem
1978 Other GMC Models V8 Two Wheel Drive Automatic 80,000 miles

Yesterday I sprayed the engine with degreaser so I could change the valve cover gaskets. I wasnt able to do it then so I left it untill the next day. When I started it up there was a horrible knock I think was in the top end. I tried starting it twice since then and it still does it. I only let the motor run for about 5-7seconds andshut it down. Could the degreaser ate through the old valve gaskets and it made it way down on to the valves or something?
Avatar
78shorty
September 28, 2008.



Yesterday I sprayed the engine with degreaser so I could change the valve cover gaskets.

Why are you degreasing it-check the oil level if okay-check oil pressure with a mechanical gauge-if within normal readings -check valve clearances and lifter/camshaft.

Rasmataz
Sep 28, 2008.