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1977 Chevy Silverado Timing mark

Tiny
VEJA29
  • MEMBER
  • 1977 CHEVROLET SILVERADO
1977 Chevy Silverado Four Wheel Drive Automatic

Why does the timing mark shift? I set it but it won't stay
Wednesday, January 27th, 2010 AT 8:23 PM

3 Replies

Tiny
SCOTTY DEE
  • MECHANIC
  • 592 POSTS
Is the rubber in the harmonic balancer coming loose? Are you using a fluid damper balancer? Are you able to get it close to 7 degrees before TDC?
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Wednesday, January 27th, 2010 AT 8:43 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be coming from the vacuum advance unit/worn distributor cam lobe Hence: Dwell angle will change ignition timing-Ignition timing will not change dwell angle.
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Wednesday, January 27th, 2010 AT 8:45 PM
Tiny
SCOTTY DEE
  • MECHANIC
  • 592 POSTS
Check for wear on the distributor gear, I prefer brass gears.
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Wednesday, January 27th, 2010 AT 8:51 PM

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