SOHC.co.uk Forums > CB350/400
sheared cylinder head bolt hole - i dont know what it is called
Nurse Julie:
What a shame that's happened. Onwards and upwards...........
Clem2112:
Welding would be risky but machining the journal back to the right diameter in the cirrcet position would be a specialist job. Still don't know how Honda managed to cut those.
billdn:
Thanks all, the cost of the repair works makes it cheaper to look for another head i guess. ho hum that's the joys of our pastimes i suppose. but having had it vapour blasted/sprayed /new valves/ lapping in and helicoils fitted it really hurts. i guess i can remove the valves and valve guides,valve springs /cotters etc as they're new and reuse on another head, providing i can get the guides out without damaging them!
Tomb:
--- Quote from: Tomb on December 20, 2017, 07:27:13 AM ---Will it drill and tap deeper and use a longer screw?
--- End quote ---
The reason I ask is I would be using that head but sorting out the threads, there are some helicoils hanging out near the break. The broken part of the head will not affect the running of the cam in the head. I've used worse on race engines.
K2-K6:
The cost for replacement at about £80 doesn't taken into account other work you'd need to do to get it to the std you've got now.
That estimated cost from Trigger looks quite a good solution to get your head back into service.
The journal can be refinished by scraping and using engineers blue to check for clearance with the cam that you'd use.
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