1978 GMC BAD KNOCK

  • Tiny
  • 78shorty
  • 1978 GMC

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?

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Sunday, September 28th, 2008 AT 6:00 PM

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  • Tiny
  • rasmataz
  • Member

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.

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Sunday, September 28th, 2008 AT 7:04 PM

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