primary gear running clearances

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Speedwell Sprint
Basic 850
Posts: 95
Joined: Thu Aug 01, 2013 12:57 am

primary gear running clearances

Post by Speedwell Sprint »

What's the running clearance of the primary gear on the crankshaft. Mine is .005 and .006, I think this is too much?
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dgear1984
850 Super
Posts: 187
Joined: Mon Aug 19, 2013 10:19 pm

Re: primary gear running clearances

Post by dgear1984 »

Speedwell Sprint wrote:What's the running clearance of the primary gear on the crankshaft. Mine is .005 and .006, I think this is too much?
My haynes says .0035 - .0065
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Speedwell Sprint
Basic 850
Posts: 95
Joined: Thu Aug 01, 2013 12:57 am

Re: primary gear running clearances

Post by Speedwell Sprint »

Looking for the clearance on the crankshaft tail. Primary inner diameter to tail outer running clearance. Dont think
Its specified in the book thanks
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carbon
998 Cooper
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Location: Scotland

Re: primary gear running clearances

Post by carbon »

Section A.18 in BL workshop manual AKD4935 states the following 'the primary gear bushes must be line-reamed to 1.3775 to 1.3780 inches (lubricated bushes only)'.

I don't have the diameter for the crank tail, but this should give an idea of the specified running clearance.
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Spider
1275 Cooper S
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Re: primary gear running clearances

Post by Spider »

There maybe some helpful info in this thread

viewtopic.php?f=3&t=7645
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Speedwell Sprint
Basic 850
Posts: 95
Joined: Thu Aug 01, 2013 12:57 am

Re: primary gear running clearances

Post by Speedwell Sprint »

Spider wrote:There maybe some helpful info in this thread

viewtopic.php?f=3&t=7645
Perfect!! Thanks
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