Sidevalve valve collets and guides

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

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RobThomas
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Sidevalve valve collets and guides

Postby RobThomas » Tue May 23, 2017 5:17 pm

If anyone breaks up a sidevalve, could they save the collets (little wedge thingies at the top of the valves) for me? I found one set from one of the rebuilt bare engines and they had been put, dry, into a 35mm camera film container and are now all rusty. Bu663r!

Also, if anyone gets the chance, could they measure the OD of the valve guides? I'm guessing that they might be about 0.5 inch / 12.7mm?

Thanks.

Rob

BLOWNMM
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Re: Sidevalve valve collets and guides

Postby BLOWNMM » Wed May 24, 2017 4:31 am

Measured new MM guides: 0-1" mike 0.4735" 0-25 digital mike 12.025 mm.
Bob
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RobThomas
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Re: Sidevalve valve collets and guides

Postby RobThomas » Wed May 24, 2017 11:41 am

Thanks, Bob.

BLOWNMM
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Re: Sidevalve valve collets and guides

Postby BLOWNMM » Wed May 24, 2017 12:33 pm

Rob
When I looked at the paper I had written the sizes on I did a conversion. The sizes did not equate. The 12.025 mm. is correct both on the mechanical digital readout and the vernier scale. Checked the size again with the 0-1' mike and is definately 0.4374" which a close conversion. Looks like I need to go to spec savers or get a vernier 0-1".
Bob
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RobThomas
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Re: Sidevalve valve collets and guides

Postby RobThomas » Wed May 24, 2017 5:12 pm

That size of 12mm plus-a-bit seems to be quite a common one. VW/Audi use them quite a lot and they have the same size ID at 7mm and length at 38mm. Wasn't sure if you'd noticed that, Bob. Nice easy source of Mn Bronze/Colisbro guides already carved for seals for the SV engine?

https://mam.rheinmetall-automotive.com/ ... 5a0c8a082c [Big file but lots of detailed valve info]

colin addison
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Re: Sidevalve valve collets and guides

Postby colin addison » Wed May 24, 2017 5:31 pm

Rob
Dunk the rusty ones in phosphoric acid overnight. The acid is used in animal milking parlors so try a friendly farmer. The acid will remove the rusty metal and then phosphate the now clean metal underneath.
Colin

RobThomas
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Re: Sidevalve valve collets and guides

Postby RobThomas » Wed May 24, 2017 5:37 pm

Tried that, Colin. They're deeply pitted and although the rust got removed, they look awful. There ought to be a few dead engines about, even Morris 8 ones and Tank engines. Not an urgent one so I'll keep looking.

Thanks for the suggestion, though. :D

colin addison
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Re: Sidevalve valve collets and guides

Postby colin addison » Sat May 27, 2017 10:47 am

Rob
I had a mates MM engine out recently and we needed some of the inner bolts, big ends etc and we got this name from ESM, IAN HARRIS MORRIS SPARES LTD. he may well be able to help.
Phone 01462 659969
e-mail ianhms@outlook.com
Colin

RobThomas
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Re: Sidevalve valve collets and guides

Postby RobThomas » Thu Jun 01, 2017 1:31 pm

Thanks, Colin. I'll give Ian Harris a try for a few other bits. Bob has kindly sent me a set from Aus so I hope I'm alright to finish the Altas. :D


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