| [GMCnet] Re: How to test distributor modules [message #368175 is a reply to message #368174] |
Thu, 23 December 2021 09:07   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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Yes, care is needed when tightening any fastener in plastic. Plastics vary
widely in strength, but unless they are reinforced with carbon fibre or
other similar products, they are nowhere close to the strength of the
fastener itself. Dick Paterson is my go-to guy when it comes to "tricks"
that can be used to insure that those fasteners don't loosen up due to
heat/cool cycling and/or engine vibrations. He blames loose fasteners as
the #1 cause of module failure. I tend to agree with him.
Jim Hupy
Salem, Oregon
On Thu, Dec 23, 2021, 6:04 AM John R. Lebetski
wrote:
> The fact that those dual thread ramp coil screws thread into plastic
> presents an added challenge. What tajes out modules is excessive Voltage
> rise on
> the coil secondary. This causes excessive (proportional) Voltage rise on
> the coil primary at the moment the module is shutting off current to the
> primary and the field collapses. If you keep all secondary parts in good
> shape and connections good, the spark event completes with less coil Voltage
> rise. I’ve mentioned before I’ve been driving GM HEI since 76 and never
> lost a module. Also it might be good to clean and replace the white heat
> sink compound under the module every 10 years or so as it shrinks as it
> dries out. Do not use dielectric grease which is not heat sink compound.
> Most
> better tool companies make a briefcase type tester. This will give a go/no
> go test to confirm the semiconductors are switching. I don’t think they
> stress the module compared to a true high road load situation that might
> be encountered, but will weed out dead units.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
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