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Re: [GMCnet] New Cruise Transducer Disk Gap when new? [message #318973 is a reply to message #318967] |
Wed, 14 June 2017 05:56 |
Ken Henderson
Messages: 8726 Registered: March 2004 Location: Americus, GA
Karma: 9
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John,
I don't know what it should be -- haven't fooled with an OEM CC for the 10
years or so since I went to the 90's Electromotor II -- but IIRC, Bill
Bramlett always set it with a business card as his gauge. That's probably
less than your 0.038".
Ken H.
On Wed, Jun 14, 2017 at 12:31 AM, John Heslinga wrote:
> Does anyone know what the new gap is between the Magnet Disk (Drive disk)
> and the Speed Disk (Vacuum Control) is on a Brand new (or specifications)
>
> Cruise Control Transducer?
...
...
I'm (educated)guessing that about .038" is about what it
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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Re: [GMCnet] New Cruise Transducer Disk Gap when new? [message #319009 is a reply to message #318967] |
Wed, 14 June 2017 15:27 |
Ken Henderson
Messages: 8726 Registered: March 2004 Location: Americus, GA
Karma: 9
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Senior Member |
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One of our silent partners says:
"A random check of about a dozen different business cards averages to about
.012” (.009 to .013”) in thickness."
Ken H.
On Wed, Jun 14, 2017 at 12:31 AM, John Heslinga wrote:
> Does anyone know what the new gap is between the Magnet Disk (Drive disk)
> and the Speed Disk (Vacuum Control) is on a Brand new (or specifications)
>
> Cruise Control Transducer?
> ...
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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Re: New Cruise Transducer Disk Gap when new? [message #319206 is a reply to message #318967] |
Sun, 18 June 2017 01:35 |
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John Heslinga
Messages: 632 Registered: February 2011 Location: Edmonton, Alberta, Canada
Karma: 4
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Senior Member |
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Thanks to everyone (including the wonderful private messages I received) for the Input on this problem. When I could not find the new gap information I disassembled a Speedometer Head to measure the gap between the magnet and the speed disks on it. As seen in this photo, I found the gap to be 0.032 inches.
http://www.gmcmhphotos.com/photos/discussion-photos/p63331-speedometer-head-magnet-gap.html
I wanted to know what the factory measurement was so I could establish the amount of wear that had occured in order to get to failure. (How much actually wore off the end of the shaft or into the thrust bushing.)
I deduced that the gap in the transducer would be similar and that is where the 0.035 measurement came from. After getting the input from you, ( approx 0.012 inches) I was surprised at the the difference. Maybe I should not have been surprised, because my experience in Briggs and Stratton Ignition and magneto Repair, we gapped the flywheel to coil gap of about 0.012 to 0.015 inches. (a thick Card stock used for parts identification and labeling)
Because I had a few transducers to play with, I tried both gaps for the repair. It turned out that both transducers performed the same, and each one seemed to be a successful repair. (I was pleased)
Given that both transducers operated well, it would seem that Without the actual Factory prescribed measurement, The range seems to be acceptable. However: In future repairs I think I will use a gap that is in the smaller end of the range. Even if the the wear lifetime to failure is shorter.
Thanks too, to Wally for the advice of pressing the speed disk back on the shaft. That worked like a charm!!
Regards to All !!!
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
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Re: New Cruise Transducer Disk Gap when new? [message #319208 is a reply to message #319206] |
Sun, 18 June 2017 04:03 |
Ken Burton
Messages: 10030 Registered: January 2004 Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I looked at those pictures and the design of that unit and think about where we have come over the years.
I started with IBM in the 1960s repairing computer equipment. Most things at the time were electro-mechanical with 90 to 95% of the service calls being mechanical wear and mechanical failures. Over the years we designed out most of the mechanical components items and replaced them with electronic ones. The failure rate went way way down and today the repair guy is an electronic parts swapper. There are very few around as they are no longer needed.
That is a true 1960's design you are looking it, but it works.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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