350cc 16MS Crankshaft end float

Information relating to the Matchless G3 or AJS Model 16 350cc Heavyweight
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Location: Aberdeenshire

Re: 350cc 16MS Crankshaft end float

Postby Mick D » Tue Jan 19, 2021 12:01 pm


I've been mulling this one over for a while now and I can't help but keep coming back to the fact the crank has been re-built just prior to identifying this issue.

Over 1/8" of end float on the crank is very large and to my knowledge unheard of, therefore I'd be confirming the crank dimensions and if they are good, looking for distortion to the cases.

As Steve hinted above, shimming the crank by 1/8" will put the oil pump gearing out of alignment and introduce wear.

Regards Mick

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Joined: Mon Jun 29, 2015 7:49 pm
Location: East Yorkshire

Re: 350cc 16MS Crankshaft end float

Postby Greybeard » Tue Jan 19, 2021 12:43 pm

It is certainly strange that a crank should have 'narrowed' by such an amount and worthy of further investigation. I would doubt it is a fault of that magnitude with the pin as the big end of the conrod would bind between the flywheels . Ive now reassembled the 1955 350 engine I'm working on so can't help with any measurements unfortunately.

I found the article I referred to though should it be of use -

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Re: 350cc 16MS Crankshaft end float

Postby 56G80S » Tue Jan 19, 2021 3:56 pm

I've bookmarked this thread as I have quite an interest in it but no intention of hijacking it!

I'll post my own when ready.



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