1978 Other GMC Models Bad knock

Tiny
78SHORTY
  • MEMBER
  • 1978 GMC
  • V8
  • 2WD
  • 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?
Sunday, September 28th, 2008 AT 6:00 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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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