The weighted sheave is attached to the hub of the harmonic balancer with a
rubber damper. The rubber breaks down and cracks, which allows the sheave
to slip with respect to the hub. Replacement is the only option. Making a
new mark will last only until it slips again, which will happen more easily
next time.
Rick "a common feature of Old engines" Denney
On Wed, Nov 22, 2017 at 7:02 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
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Rick Denney
73 x-Glacier 230 "Jaws"
Off-list email to rick at rickdenney dot com
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options: http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
GMCforum
Search
Help
Register
Login
Home
