distributor cotterpin bolt

for those with Series MM sidevalve cars produced between September 1948 and February 1953
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ian.mcdougall
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distributor cotterpin bolt

Post by ian.mcdougall »

Does any one know if the cotterpin bolt for the distributor is the same as a bicycle cotterpin bolt as I sheared the one on my sidevalve. If not can I get a replacement or do I have to weld thread back on and recut thread

mike.perry
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Re: distributor cotterpin bolt

Post by mike.perry »

No, a cycle cotter bolt is tapered, a dist. bolt is curved the same profile as the dist. hole.
Get some made and use a larger threaded section 5/16 UNF thread (9/16 A/F nut) . The nut can be done/undone with 9/16 socket or ring spanner. It works for me. :) Sell the extras to cover your costs
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mike.perry
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Re: distributor cotterpin bolt

Post by mike.perry »

I can get some cotters made, let me know
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ian.mcdougall
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Re: distributor cotterpin bolt

Post by ian.mcdougall »

Thanks I will have a go at welding this weekend if its not sucessful i will be in touch.
I may order a spare just in case
Ian

mike.perry
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Re: distributor cotterpin bolt

Post by mike.perry »

I am investigating the production of a small batch of cotter pins which clamp the distributor on the USHM3 engine. They will be produced from 3/8 Unf bolts which means that the threaded section will be 3/8 Unf and the nut will be 9/16 A/F which will the overcome the occassional problem of the thread stripping or breaking.
I have been using a modified cotter pin for many years without any problems and a 9/16 A/F ring spanner is a good fit for tightening or slackening the bolt.
If anyone is interested let me know so that I can estimate the quantity required
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ian.mcdougall
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Re: distributor cotterpin bolt

Post by ian.mcdougall »

I welded mine but I would still be interested in one as a spare so put me down for one please mike

mike.perry
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Re: distributor cotterpin bolt

Post by mike.perry »

I now have a few distributor cotterpin bolts for the USHM3 engine. They are zinc plated high tensile steel with 3/8 UNF thread, 9/16 A/F nut and spring washer
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seriesmm_1
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Re: distributor cotterpin bolt

Post by seriesmm_1 »

PM sent Mike
Regards
BrianR

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