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Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. [message #326315 is a reply to message #326271]

Fri, 24 November 2017 19:11

James Hupy

Messages: 6806
Registered: May 2010

Karma:

Senior Member

That is correct, Rob. But the "fussy duck" engine balancers do the steps I
mentioned, in addition to the crank, rod, and piston work. Nothing is left
unbalanced except the owners checkbook. (Grin)
Jim Hupy

On Nov 24, 2017 5:07 PM, "Rob Mueller" wrote:

Jim,

My experience with "good overhaul shops" is that they balance the crank by
drilling holes in the counterweights to lighten them or
filling the holes with lead to increase the weight.

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 James
Hupy
Sent: Friday, November 24, 2017 11:11 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Did you know your timing mark can MOVE on Olds
engines? I didn't.

MOST OF the harmonic balancers that I have encountered on Olds engines that
have not been tampered with, do not exist any evidence of lightening drill
holes on the outer ring. That tells me that the purpose is to cancel
harmonics, not engine balance. The engines that have been overhauled and
rebalanced frequently DO HAVE drill spots on the balancers as well as the
flex plates, as is common in good overhaul shops.
Don't know all the specifics of engine harmonics on multi-cylinder
engines, but it is a complex mix of crank pin location, firing order,
stroke length, rpm range, etc, etc. But I do know this much. If a
compensating balancer is separated and no longer aligned like the factory
did it, it possibly is not a good thing for engine longevity.
Jim Hupy
Salem, Or

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[Message index]

		[GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: BobDunahugh on Wed, 22 November 2017 18:01
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: Richard Denney on Wed, 22 November 2017 18:09
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: James Hupy on Wed, 22 November 2017 18:15
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: Matt Colie on Thu, 23 November 2017 08:16
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: Kosier on Thu, 23 November 2017 12:10
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: Larry on Thu, 23 November 2017 12:21
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: Ken Burton on Thu, 23 November 2017 11:21
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: BobDunahugh on Thu, 23 November 2017 19:39
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: USAussie on Thu, 23 November 2017 21:16
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: Richard Denney on Thu, 23 November 2017 22:38
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: emerystora on Thu, 23 November 2017 22:49
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: Kosier on Fri, 24 November 2017 14:15
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: emerystora on Fri, 24 November 2017 15:39
		[GMCnet] Fw: Did you know your timing mark can MOVE on Olds engines? I didn't. By: BobDunahugh on Fri, 24 November 2017 11:17
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: Ken Burton on Fri, 24 November 2017 02:47
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: JohnL455 on Fri, 24 November 2017 10:53
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: James Hupy on Fri, 24 November 2017 11:11
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: USAussie on Fri, 24 November 2017 19:05
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: Ken Henderson on Fri, 24 November 2017 19:19
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: James Hupy on Fri, 24 November 2017 19:28
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: Matt Colie on Fri, 24 November 2017 20:19
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: JohnL455 on Fri, 24 November 2017 12:48
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: James Hupy on Fri, 24 November 2017 19:11
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: USAussie on Fri, 24 November 2017 19:59
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: Ernest Dankert on Fri, 24 November 2017 20:32
		Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. By: James Hupy on Fri, 24 November 2017 20:38

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