SOHC.co.uk Forums > CB750
Oil pressure issue / motor rebuild
Trigger:
Make sure the con rods have not ovaled, as you will be wasting new shells.
AshimotoK0:
--- Quote from: Trigger on September 15, 2016, 08:59:59 PM ---Make sure the con rods have not ovaled, as you will be wasting new shells.
--- End quote ---
May still have rods off that crank if they are ! Isn't it wonderful packing cranks so courier doesn't trash them ! :'(
MrDavo:
I don't really understand why, but although the main bearings were all toast (shells and journals), the conrod bearings were all fine.
I will be using new shells, of course, to fit this crank, I'll try checking the rod big ends for roundness with my vernier calipers, though.
Trigger:
I did not realise that the con rod shells were all fine. To that extent of wear to the crank case shells, I would of thought it would of picked up on the rod shells.
MrDavo:
On careful measurement the crankpins and shells had slightly ovalled, but the roads were still perfectly circular inside.
Ash, your crank measured up perfectly, all 'A's as you said, and as marked. Please pm me as to where to Paypal the money to, or whatever other way of payment you want, again a thousand (or 736) thankyous.
Now this is interesting- with a full set of A crank journals, and all As on the cases, (not Bs as I thought), you'd fit yellows. We checked the old crank and although the journals were too FUBAR to measure, this crank was also marked. AAAAA. However, a set of greens had been fitted. As we understand the crank bulletin, this would mean you have the maximum size journal, the minimum size hole in the cases, and a full set of greens fitted, which is wrong, and tightens things up by .005 or so - would this lead to a too tight fit that semi seized on startup?
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