AJS & Matchless Owners Club

Hi All,
Would I be correct in assuming that the stud thread to crankcase is 3/8" BSW 16tpi?

I do not think so. What is the part number. From which the thread type can be discovered in a parts list.
Is it actually called a stud or bolt that goes through the crank case. or stud like cylinder stud of which one end screws into the crank case.

1955 singles have crankcase studs 5/16 dia x 26 tpi thread either end in various lengths to suit................ so spares book says under crankcase bolts, so would have nuts either side.

Best regards
Colin

http://archives.jampot.dk/book/Spares_l ... ingles.pdf

cbranni wrote:1955 singles have crankcase studs 5/16 dia x 26 tpi thread either end in various lengths to suit................ so spares book says under crankcase bolts, so would have nuts either side.

Best regards
Colin

http://archives.jampot.dk/book/Spares_l ... ingles.pdf

Crank case stud also shows dimensions in the parts book. Cylinder fits on 4 off them. Cylinder nuts go on the 26 tpi end.

I had wrong end of stud as usual

The roadster heavyweight longstroke singles use 3/8 BSF (20 tpi) (screws into crankcase) x 3/8 CEI (26 tpi) (takes holding down nut) studs. Cylinder head bolts are 3/8 BSW; rocker box studs are 5/16 BSW (22 tpi). Cheers, Andy

Thank you gentlemen for your replies. The spares list, part no. 000300 says the stud is... 1 25/32in. by 3/8" (I think, the copy is unclear) by 26 and by 20 - so BSCY and BSF. I've tried a bolt in the crankcase holes, a 3/8" by 16 tpi - BSW - fits! Something is obviously amiss. The threads are not good so need helicoiling. What size kit should I go for, 3/8"BSF methinks.

Yes BSF into crankcase BSCy other end...


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