SF 750 Camshaft Flange

[mikeringrose]

Hello,

I wonder if someone could advise me please. Having stripped the head and pistons I have found one cam flange loose but the key us is broken off in the other good cam/flange. It looks like I have no choice but to remove the good flange from the good cam in order to replace the key. How best should I remove and refit the flange ensuring it remains a good interference fit?

Also, has anyone had any experiences good or bad with bead blasting cylinder blocks and heads?

Many thanks
Mike

 

[Tippie]

You will have to press off the flange from the good half to get your broken key out.
On my 90deg twin I do not have the key going through the chainwheel between the cams, it is just in the flanges. As long as the surfaces of the flanges and the camwheel are good, the 3 studbolts hold it perfectly, been there for 15 years, only racing for the last 8 years. (I also have the flanges slotted so that I can degree in each cam separately.)
Blasting has been covered extensively, do a search on the forum.

 

[Ernesto]

Hello, Mike.

You could try first with a 2-arm puller, before you
use a press.
For refitting a tight flange put the cam in the freezer
first and warm the flange up (and be quick!).
For replacing the wide flange you could measure the
camshaft part precisely and order an undersize flange
at Andy W.

hth
Ernesto