| Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. [message #326298 is a reply to message #326297] |
Thu, 23 November 2017 21:16   |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma:
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Senior Member |
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Bob,
Looks like Olds parts guys didn't agree with you.
:-)
Parts Book 78Z Page 8-4
ENGINE
8.005 CYLINDER BLOCK, CRANKSHAFT AND OIL PAN (Cont.)
Key 230 260 Part Number
22 1 1 400133 BALANCER ASSY.-crankshaft (1973)
22 1 1 417142 BALANCER ASSY.-crankshaft (eff. w/1974)
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Bob Dunahugh
Sent: Thursday, November 23, 2017 7:40 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't.
It's not a balancer as commonly referred to. But a harmonic dampener. It's used to reduce the harmonic that occur at certain RPM
ranges in the crankshaft of internal combustion engines. That's why the outer steel mas is mounted on rubber. Run without one. The
crank will break. ( GENERALLY ) The heavier the crank. The larger the damping mas. Bob Dunahugh
________________________________
From: Bob Dunahugh
Sent: Wednesday, November 22, 2017 6:01 PM
To: gmclist@list.gmcnet.org
Subject: Did you know your timing mark can MOVE on Olds engines? I didn't.
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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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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