SOHC.co.uk Forums > CB750
Oil pressure issue / motor rebuild
K2-K6:
Hoses look good but a shame it's too far gone to get it going, I was hoping for you that you may have got something more positive out of it.
To send the crank, could you wrap it in clingfilm then stand it on end in a strong box on a polystyrene block and use expanding builders foam to in effect create a bespoke cradle to protect it?
royhall:
I would wait until you strip the engine, before thinking about your course of action, your crank may be okay.
Bryanj:
Cranks rarely go so a used one should be OK but get one with rods as if its knocking the rod concerned will be toast guaranteed
MrDavo:
If that's the case then a second hand crank will be the answer - if I have to change a rod then I have to find one with the same weight (there are 3 grades) to match the others or the balance will be out. As Roy says I won't know for sure until I get in there, but there's not much doubt in my mind that a big end is fubar, after combining the knock with the sight of metalflake oil.
Sadly time and the need to reorganise in the garage to do the job means it may be a while, but I'll update you when I know more. I wanted to take the motor out to polish the cam cover anyway. :(
AshimotoK0:
I might have a crank to sell. I do have a collection of rods too but they are a mixed bunch from other cranks. I had both of my cranks miked last year by a top engineering guy who sadly passed away last year and they were both fine. Just need to check that they both are the types that take M8 down to M6 advance bolts as Trigger told me me that not all 750 cranks are the same up to the Auto ( I was previously told by a top sandcast restorer that they were interchangeable up to the auto), which has a HyVo chain. I want 25 quid for it if you are interested as long as both have M8 advance bolt tappings. Pretty sure the spare crank came from an F1 and I do still have the engine number somewhere.
I am in East Yorks BTW
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