SOHC.co.uk Forums > CB750
Oil pressure issue / motor rebuild
MrDavo:
I may get another pump for peace of mind, let me know when you get the seal kit in.
The pumps DK have for sale are unopened - they could be just as bad inside, so you are taking a punt unless they'll change them.
I just had a message to say the engineers have got the rotor and starter clutch off my old crank.
bytio:
Ensure the 3 o rings are new, 2 large outer ones seen in the pic, plus the smaller one that the rotor shaft goes through ( a bit of a pig to get out) if these are not in good order oil will escape from pump and loose oil pressure
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AshimotoK0:
As I said in PM I do have a spare pump but unsure of condition and model its off
MrDavo:
As far as the pump goes, it all looks good in there as far as rotors and body go, I just don't know what is 'normal' for the scratching on the endplates. certainly the one they took apart in the Haynes manual looks just the same as mine inside. I was hoping Trigger could say 'good' or 'scrap' but I realise its not that simple from a photo.
A replacement may be wise, but a bit of a pig in a poke as far as condition goes. Maybe I should stick with what I've got, with new seals.
I am all too aware that I haven't yet found a definitive cause of why the mains failed, but that probably points back to the kinked feed hose, which would leave no clear evidence.
MrDavo:
I've just been cleaning out the main horizontal oil gallery, once I'd manage to remove the end plug - IDK if mine's ben polished undersize, but the only spanner that would fit was that old Honda favourite of, er 1/4 inch Whitworth! Maybe its because oilways count as plumbing.
No glass beads or other nasties came out when I flooded brake cleaner up there, it ran out of the mains as it was supposed to do.
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