SOHC.co.uk Forums > CB500/550
Crank not rotating
alexdecker:
--- Quote from: Oddjob on May 07, 2022, 05:57:13 PM ---The black one I'd replace, both of them, it's not really a good idea to mix a new and a worn one on the same journal. Left in I think it will end up scoring the journal surface. The black shell can only have come from either number 2 or number 4 journal, as the ONLY combination to use a black shell is a C2.
As I said though, finding black shells is difficult, 13315-323-000 is the part number, CMS did have some months ago but they've gone now and they weren't cheap when they were available, they are showing them as selling for £11.25 or so but I can guarantee that when they were available they were a LOT dearer, I think they reduce the price of the part when it sells out so that they can buy someone else's stock and claim they aren't worth as much. Sure they were close to £28 a shell when they did have them, plus P&P of course.
I'm not keen on the state of the rest of the shells TBH, that scoring on the upper edge is worrying, not sure how long this engine may have been stood but to me the surfaces of the shells look contaminated and that's why they are starting to break up. I'd replace all the crankshaft ones if it were mine, I'd also check the rods shells just in case.
£230 for both or each?
--- End quote ---
Ah, the black shell was actually from the number 5. I don't know what the signs of a previously opened bottom end is, but somebody must have opened it before me. I marked the positions of the bearings when taking it apart, and that black one can not have been anywhere else than there.
I will use a micrometer on the crank and try and figure out what the correct bearing sizes should be, and source some new ones. What are the options of I can't source a particular color? I will also open up the rod and see how they look like in there. Man, was hoping I could avoid all this. But hey, might as well now, as long as Im in here. This turned out to be quite a lot more expensive than I thought it would be.
And yes, £230 as a collected price for both :)
PS: Are the rod bearings just as rare as the crank bearings?
Bryanj:
If you cant get a particular size go for the next thickest shell, i have in the past fitted all black shells and done some carefull running in, which you dont have to do if you get the Honda spec clearance right
Oddjob:
Look for markings on the crank
Rod shells are getting rare, especially the black and yellow ones.
alexdecker:
--- Quote from: Oddjob on May 07, 2022, 08:14:10 PM ---Look for markings on the crank
Rod shells are getting rare, especially the black and yellow ones.
--- End quote ---
The markings on the crank seems to have disappeared completely. But it’s just a matter of measuring and matching up, like with the crank journals, right?
McCabe-Thiele (Ted):
The markings are not in plain sight it took me ages to find mine as I was either looking in the wrong place or not seeing them. Eventually I found most of the. After cleaning the Crank with petrol using a paint brush.
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