| Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. [message #326287 is a reply to message #326280] |
Thu, 23 November 2017 12:10   |
Kosier
Messages: 834
Registered: February 2008
Karma:
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Senior Member |
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Matt,
The '68 and later iron block Cadillac's had their timing marks on the back
pulley. Oddly, they used a balancer with sheet metal pulleys
from '68 to '73. Then '74 to '76 used cast iron pulleys with no balancer.
'77 and later used sheet metal pulleys with no balancer.
I've always wondered what their reasoning was. When I built my serpentine
belt setup, I started with no balancer and later added one.
Never could see or feel any difference. I always wonder WHY?
Gary Kosier
77PB w/500Cad
Newark, Ohio
--------------------------------------------------
From: "Matt Colie"
Sent: Thursday, November 23, 2017 9:16 AM
To:
Subject: Re: [GMCnet] Did you know your timing mark can MOVE on Olds
engines? I didn't.
> BobDunahugh wrote on Wed, 22 November 2017 19:01
>> 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
>
> I will take the moment to both warn you all that this can happen to any
> engine that has rubber damper installed. That means just about every
> passcar
> engine produced since WWII. I have had it happen to new parts on
> durability engines. If you have a chance check for witness marks. If you
> don't see
> them, make some.
>
> And I will take a little more of your time to wish everyone in the great
> family a Happy Thanksgiving. We are getting ready here and will have the
> daughter and her family here and have number of four grandsons from our
> son's side here for the weekend.
>
> Matt
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
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