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MG Midget and Sprite Technical - Flywheel lock tabs

Hi,

Does anyone know where I can buy a pair of lock tabs for my 1965 10cc engine flywheel please?

The part number is 12G612 and for some reason they don’t make them anymore.

They do make them for 10CG engine but they are smaller.

Thanks

James
James Paul

I don't usually bother with the locktabs on my 1275. Just use locktight and torque accordingly. Nothing has ever come undone over the last 30 or so years!
Bob Beaumont

Thanks Bob,

Which one would you recommend?
James Paul

Thank Bob,

Which one would you recommend?
James Paul

James
I use Loctite Blue 243 as its oil resistant. Make sure the fixings and the crankshaft threads are clean and grease free (Use brake and clutch cleaner) before you apply the loctite
Bob Beaumont

Great thanks.

Would you cover all the tread or part of it?
James Paul

I've used Loctite for this application in my 1420cc engine, I can't remember which though, as I couldn't use a tab washer as using cap screws to retain the flywheel. The 1420cc is a 1380cc bore with the 10CC crank.
David Billington

I would just coat the thread which goes into the crank.
No need to cover it all, but it doesn't really matter as the Loctite spreads up the thread as the bolt is screwed in.
Bob Beaumont

Great thanks
James Paul

Just a tip James---
Don't do them all together-
Semi tighten the flywheel bolts, then remove one, loctite it and tension it up, then move to the oposit one and do that, then the other two-
Reason--If all the bolts are loose and you go screwing bolts with loctite in the loctite can get forced in between the flywheel and the crank flange, it needs to be bolted up then do one at a time
willy
William Revit

Thanks Willy! Appreciate that advice
James Paul

James

Some potentially useful background info on 10CC code 1098cc MG midget engines and rebuilding them on a Morris Minor forum: https://board.mmoc.org.uk/viewtopic.php?t=71725

Cheers
Mike
M Wood

I do not like using tab washers in any application as by design they need to be malleable and coud therefore become further compressed during equipment operation such as to result in loss of bolt load etc.
I do however replace with hardened steel washers that I usually have to make specific for each application e.g. crownwheel.
Therefore follow previous advice and fully tighten full bolt set before removing and replacing individual fasteners with chemical thread lock.
S G KEIL

I seem to be at odds with everyone here. I've only ever used the original arrangement as per picture.

I smear grease on the bolt threads not thread lock, no spring washers, and just torqued as normal, followed by bending over the tabs. After 45 plus years, with multiple engine rebuilds at 100000 miles plus, I've never found any of the bolts loose. And I should add, I've reused the lock tabs more than once, naughty me. 🤣.

Surely all the bent lock tabs do anyway, is prevent the bolt spinning out, only if it has loosened already. It doesn't prevent it losing torque tightness;
-- does it?



anamnesis

This thread was discussed between 02/08/2022 and 11/08/2022

MG Midget and Sprite Technical index

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