| Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. [message #326273 is a reply to message #326271] |
Wed, 22 November 2017 18:15   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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If you have the compensating dampener very clean, you should be able to
locate "witness marks" placed there by the factory. They appear as a single
chisel mark that bridges the hub, the rubber dampener, and the outer rim.
All in a line. If it slips, the line no longer appears straight, and timing
by the mark on the rim will no longer be accurate. I have seen several
dampeners misaligned like this, most had been cleaned in a hot tank.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Nov 22, 2017 4:02 PM, "Bob Dunahugh" wrote:
> When I went to set the timing to the proper 8 degrees of advance. It ran
> terrible. Called Ken Henderson. He said that the outer part of my harmonic
> dampener had rotated. I DID NOT know that the Olds unit could do that. I
> was aware of other engine. So if at some time your timing was set to a
> moved mark. It could be affecting the timing. Thus reducing mileage. I'm
> thinking that I may have set my timing retarded the last time due to this.
> There are indexing marks that GM did when new. New one is $42. Bob
> Dunahugh 78 Royale
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