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R Moulding
R Moulding
Christchurch NZ
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Re: 48' BSA B31 tappet clearance problem
dean toensing #797150 01/31/20 11:11 pm
Joined: Feb 2014
Posts: 739
Likes: 44
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Joined: Feb 2014
Posts: 739
Likes: 44
Hi Dean,
There are inner and outer lands on the cylinder and head
Use fine paste on the inner land and coarse on the outer
Lap until both areas show an even contact all over
The coarse paste on the outer areas should provide a very small clearance when the inner area is seated
This method should ensure that there's a gas tight joint at the inner lands when the head bolts are tightened
I just put a very light smear of grease on the joint areas
Run a few drops of oil down into the head bolt fittings in the crankcase, inside those fittings are the area's subject to friction when tightening
the head bolts

John

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Re: 48' BSA B31 tappet clearance problem
dean toensing #797174 02/01/20 2:56 am
Joined: Nov 2015
Posts: 157
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Thank you John!

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