Re-threading a stipped thread in Dynamo Mount - Part 2

for those with Series MM sidevalve cars produced between September 1948 and February 1953

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gtt1951
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Re-threading a stipped thread in Dynamo Mount - Part 2

Postby gtt1951 » Mon Apr 29, 2019 7:39 pm

Insertion time
IMG_20190416_180806.jpg
IMG_20190416_180806.jpg (1.56 MiB) Viewed 302 times
Next, V-coil in place
V-coil in place.jpg
V-coil in place.jpg (589.76 KiB) Viewed 302 times
Unfortunately, the adjustable coil collar slipped along the tool shaft and I inserted the v-coui deeper than the 1 turn suggested.
You can't back them out as the coils are only "one-way".
Snap-ff tool in use to snap off the V-coil key
snap-off tool.jpg
snap-off tool.jpg (850.78 KiB) Viewed 302 times
Dynamo back in place with a suitable number of spacer washers placed between the side bracket and the dynamo bolt lug.
Dynamo remonted.jpg
Dynamo remonted.jpg (643.22 KiB) Viewed 302 times
Hope this will be of help to others.

George.

'51 Hi-light with Sidevalve 918 engine,
'55 4-dr with 803 engine,
'56 Traveller with 1098 engine.

RobThomas
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Re: Re-threading a stipped thread in Dynamo Mount - Part 2

Postby RobThomas » Tue Apr 30, 2019 8:26 pm

Just need the right profile pulley and you're sorted. Any luck? Ford one MIGHT fit.
Cardiff, UK

alanworland
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Re: Re-threading a stipped thread in Dynamo Mount - Part 2

Postby alanworland » Tue Apr 30, 2019 10:49 pm

That does a great repair! Never understood why the MM used such a wide belt, not as though the dynamo generates 5kw!

Alan
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philthehill
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Re: Re-threading a stipped thread in Dynamo Mount - Part 2

Postby philthehill » Wed May 01, 2019 6:58 am

In an ideal world all internal threads in alloy should be fitted with Helicoils, makes the thread much more resilient.


smithskids
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Re: Re-threading a stipped thread in Dynamo Mount - Part 2

Postby smithskids » Wed May 01, 2019 9:20 am

I was lucky, my water jacket/ dynamo bracket is cast iron, it was on the car when I bought it in 1970.

gtt1951
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Re: Re-threading a stipped thread in Dynamo Mount - Part 2

Postby gtt1951 » Wed May 01, 2019 12:54 pm

RobThomas wrote:
Tue Apr 30, 2019 8:26 pm
Just need the right profile pulley and you're sorted. Any luck? Ford one MIGHT fit.
So far I got one response from a member in Australia, but he hasn't yet sent me the photos.

'51 Hi-light with Sidevalve 918 engine,
'55 4-dr with 803 engine,
'56 Traveller with 1098 engine.

gtt1951
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Re: Re-threading a stipped thread in Dynamo Mount - Part 2

Postby gtt1951 » Wed May 01, 2019 1:08 pm

smithskids wrote:
Wed May 01, 2019 9:20 am
I was lucky, my water jacket/ dynamo bracket is cast iron, it was on the car when I bought it in 1970.
The "other" green low-light, that was on eBay, had the cast iron dynamo mount - was yours like this
Dynamo Mount.jpg
Dynamo Mount.jpg (142.17 KiB) Viewed 226 times
I did buy a spare alloy one, from ESM, to replace the poor-condition one on my high-light, but it turns out that the fabricator has cut 5/16" UNF threads instead of M8x1 fine.

'51 Hi-light with Sidevalve 918 engine,
'55 4-dr with 803 engine,
'56 Traveller with 1098 engine.

RobThomas
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Re: Re-threading a stipped thread in Dynamo Mount - Part 2

Postby RobThomas » Wed May 01, 2019 5:34 pm

That's a USHM2 engine with the bracket cast into the head. Your engine is from a much later (non-Lowlight) car. The BMC President tractor and the Vedette boat engine had iron side castings on the later block.
Cardiff, UK


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