SOHC.co.uk Forums > CB750
Rewiring K2 with later high beam switch
the-chauffeur:
I'll answer my own question for those who're interested with the wisdom of Hondaman:
"Boy, I know all about the hectic part!
The casting: the main reason these were closed on the bottom was to keep oil seepage up those threads to a minimum. Honda has always been concerned that their engines should be dry on the outside. If the engine is still open, you might try using a bit of JB Weld epoxy, fresh and well-mixed, after cleaning the site with acetone or lacquer thinner. This epoxy work well by gripping those pores and sealing into them, and it withstands engine heat easily. It is impervious to hot oil, once cured. It is a mainstay of the repairs I have done to both these aluminum engines and cast-iron ones, for years. But, it must be FRESH, not old, and well-mixed, and applied no more than 3mm (1.8") thick.
It's actually good that the little piece fell out now: it could have popped up into the tranny gears and locked them tight while snapping into a hard shift into 2nd gear near redline. Makes a real mess (and we won't discuss how I know about this little event...). :-D"
Bearing in mind my 350 and 450 both have open ended cylinder stud holes, I reckon it'll be fine as is. Which is something of a relief - as is the fact that it went when it did and didn't wait to spring a really nasty surprise on me . . .
UK Pete:
Lets hope thats the last of it neil, you deserve a bit of good luck with this engine,
Pete
the-chauffeur:
Yeah - that's what I thought. Sadly, the engine has other ideas.
There's a leak between the crankcases in the sprocket area - the part of the cases that sit between the sprocket and gearbox. Yes, it's definitely there and not the seal behind the sprocket; I cleaned everything with thinners and then put talc on it to see if I could trace the problem (which was oil doing more than just dripping off the bottom of the engine).
Christ. Either I'm cursed or this f*cking engine is. Still, it's not a mechanical problem, so it's not an expensive fix; just time consuming. Again.
<sigh - again - sigh>
Bryanj:
That might be the locating ring holding the cases slightly apart mate, something physical has to be stopping them going together with all them bolts on it
the-chauffeur:
Guess that's possible - I know one of them was a pain in the arse to fit.
Having said that, the leak isn't near to or parallel with one of those locators (as far as I can recall). Also, the hole is sooooo small - and it's only leaking from that point - that I reckon it's the sealant that's the problem. Added to which, I'd've thought I'd have bigger problems than a pinhole oil leak to worry about if one of the locators was out of whack. ;)
I'll let you know . . .
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