SOHC.co.uk Forums > CB750
CB750 K3 Oil leak
Yoshi823:
This is a genuine 750F2 head gasket
, & as BryanJ has said, there are areas of the gasket that have there 'sticky' patch next to the cam chain tunnel & around the oil feed holes. I always use a thin smear of copaslip on my graphite headgaskets, & have never had a problem. But if I did have a problem on the top end, I had done this mod
to the frame so that the engine was more accessible.
sim2011:
Well I've carefully taked it apart,
The head gasket is soaking with oil all over , the bolts were correctly torqued and the cam rubber discs hadnt leaked.
To me it looks like the Honda O rings arent thick enough ??
Mine measure 2.36mm
To me it looks like it has leaked throught these .
Nightmare !!
K2-K6:
Oooooh! looks like nothing is sealing that should. Haven't got anything available to measure to help with o-rings currently.
You could try taking off gasket and leaving o-rings in place then slide head back on and feeler gauge the gap to see if they are going to be compressed or not to give you an estimate. They'd obviously have to exceed the gasket thickness to do anything.
Not worth wasting a 65 quid gasket until you can get some sort of answer on the o's i guess. have you got the old o-rings? They are usually compressed when they come out so i'd estimate at .5mm plus gasket thickness to be effective.
What is the counterbore depth where the o-rings go?
BTW yoshi823 I like that frame mod of your ex F2 very neat piece of work.
Seamus:
I may be wrong but did'nt the K3 onwards have tube like seals in place of the earlier O rings?
sim2011:
Right
Took the follwing measurements
David Silver supplied Pattern Head gasket 1.16mm
Honda Genuine O rings 2.36mm CMS Parts fiche states as 2.5mm but mine have been torqued down
Cylinder Counterbore depth .93mm
That leaves just .27mm to seal
I will post again when the genuine head gasket and new o rings arrive.
Thanks
Simon
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