SOHC.co.uk Forums > CB750

Head leak after rebuild

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McCabe-Thiele (Ted):
I thought the nicks & picks indent was old gasket material distorted by the camera.

archmill:
Alimacdee2, I have a spare head gasket you can have. Got it in a full gasket set, with round cylinder cut outs. I have a 1979 F2 which has "egg" shaped cylinder cut outs so had to use a different gasket. You are welcome to the gasket which is unused.
Assume you are in Aberdeenshire.
Archmill (Motherwell)

K2-K6:
I can see what you mean Ted, also I can see others that don't conform to that pattern, when viewing under raised magnification.

There's other effect too, near some of the stud holes are "strakes" appearing to curve, albeit slightly, down in towards those holes. Almost looks like a legacy of hand clearing of gasket previously as possibility.

Quite a few elements that should competently clean up in resurfacing.

Alimacdee2:
Thanks for those reply’s to my post, and the offer of the gasket, always much appreciated on here, I’ll definitely be having it skimmed , that should remove those marks I hope, maybe that’s all it needs. I’ll let post the result of this. I’ll remove the valves  because they want to clean any swarf out of the head.

McCabe-Thiele (Ted):
The firm I used to skim my 500 cylinder head had a fancy newish  machine that could take off really small amounts.IIRC it ended up being just under 5 thou of an inch to remove all the marks near the main sealing rings. The surface was like a mirror, it wasn't daft money either about £40.

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