Hi everyone. I have a friend who has offered to sell me his newly machined thick ended 850 crank he no longer needs. My question is, will this fit into the block of an 850 that originally had a narrow ended crankshaft or would machining be required? I guess a few parts would need to be swapped such as flywheel etc.

thanks

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Present
'71&'76 Clubman minis
1961 Austin Se7en

It drops straight in. You then use the same flywheel and primary gear as a 998/1098, not the old 850 ones (which are both too small in the bore).

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

OK great! thanks for that DrMini! Is there an oil hole i need to plug up on the block?

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Present
'71&'76 Clubman minis
1961 Austin Se7en

You are thinking of the old wet tail crank's lube hole for the primary gear bush?
Nope, the thick tail 850 crank came out when they went to dry primary gear bushes. it's exact same tail as a 998 or 1098.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

ah yes. good point i was getting myself confused. thanks for that. I will let you know how it comes along. I probably wont start working on it for some time yet.

_________________
Present
'71&'76 Clubman minis
1961 Austin Se7en

ah yes. good point i was getting myself confused. thanks for that. I will let you know how it comes along. I probably wont start working on it for some time yet.

_________________
Present
'71&'76 Clubman minis
1961 Austin Se7en