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big four primary case problem

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big four primary case problem

Posted by martin_main at June 12. 2017

Can anyone help? I need the dimensions between centres, of crankshaft, gearbox mainshaft (taking into account side to side movement (about 1/2”)) and footrest holes for an inner primary case to suit my 53 Big four rigid teles. This will help me when scouring jumbles for one.

 

Thanks Martin

Re: big four primary case problem

Posted by Michael Rettie at June 12. 2017

Assuming that '53 is same as 1950.

Like this:

Attachments

Re: big four primary case problem

Posted by martin_main at June 12. 2017

Hi Mike,
thanks for the reply. I have to admit, I never thought to look
at the parts list for model comparison. It seems Model 1 (big four) and 16H
are the same, as such the butchered item i have is the same as yours - going
off the colour - I'd say WD 16H. My big 4 has a T engine fitted but I
wouldnt have said that would make any difference. However looking at a
picture of a 53 ES2, the footrest does look to be nearer to the level of the
crank than either yours or mine. So having the T engine in could mean I need
an ES2 case. You are right the cost would br too much, but if you could send
me dimensions (as in attached sketch) I'd be grateful. The sketch shows the
dimensions I ideally need - it will be interesting to compare you sizes.

thanks again, Martin

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