SOHC.co.uk Forums > CB350/400
Cylinder head bother
mike the bike:
I've been having fun a games with the replacement head. Two of the rocker cover bolts had sheared off (not my doing) so I tried drilling them out with my crappy 50 quid pillar drill. Needless to say, they were a bit out but I tapped them anyway.
After refitting the head, cam etc those 2 bolts wouldn't go in because the holes were a bit out.
I then took the head to an engineering bod who does engine work. He spark eroded the old bolts out but couldn't re-tap to M6. Instead, I get my head back tapped to M8. I wasn't over happy with that so I had a bit of a think.
I bought a length of 8mm aluminium tube from B&Q and tapped an M8 thread on the outside. I then cut two 20mm lengths and threadlocked them in the M8 holes. After leaving it a bit for the glue to go off I tapped the middle to M6, ready for refitting - again.
Getting there, slowly.
Bryanj:
Try googling keenserts mate
mike the bike:
Never heard of Keenserts, I was looking at using Timeserts but there's not enough material to play with - too close to the edge. I've done it now anyway and it's not going to need a gread deal of torque for those bolts.
mike the bike:
Ready for re entry. I've left a lot of stuff off to a) make it lighter and b) easier to torque things up when its in the frame
Johnwebley:
--- Quote from: mike the bike on May 17, 2017, 09:55:17 PM ---Ready for re entry. I've left a lot of stuff off to a) make it lighter and b) easier to torque things up when its in the frame
--- End quote ---
the motors looking good
take care of your back !!!
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