SOHC.co.uk Forums > CB350/400

sheared cylinder head bolt hole - i dont know what it is called

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royhall:
To be honest that heads scrap. The journals don't look too good, it's full of loose helicoils, it's broken right through to the journal etc. I would just buy the head that Pat suggested. That's just a paperweight IMHO.

matthewmosse:
Ho humm, not good. I would be looking for a spare head in better order myself, but that would be going in a box in the furthest corner of the loft, it's still fixable and one day might save someone's resto where theirs is worse. Values are fluid, today's beyond economic might be tomorrow's bargin bit. 4 years ago I had a slightly better head needing a bit of fin welding to fix, took a year to get shifted, only got £10 in a car boot in the end. Helicoils are a bit delicate and can wind themselfs back out. Not entirely the best thing in the world but they do save a few things. Apparently timesert are an alternative that have serrations to stop them wind out. Mostly I find helicoils ok as long as you carry a few spares in case one winds out.

kevski:
I'm with Roy on this one, replace with a decent second hand one i'm sure someone on here will be able to come up with the goods, i am not a helicoil fan, much prefer time serts if applied with the right tool they lock in a lot better, another thing with both systems or should i say with some people that do them is the hole is rarely tapped out deep enough to allow the original bolt to go down to it's full depth without meeting  the original thread in the part, this then creates more problems, i.e heli coils/time serts backing out or being forced out.

matthewmosse:
It is odd the way its broken up, maybe it is as Kevsky said, not drilled out far enough so the old thread pushed the helicoil out as the two met. Not seen that before but then I've only helicoiled things that had the old thread totally stripped out.

Bryanj:
You cant transfer guides from one head to another with any sucsess

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