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If you can see the C I can't work out why you can't work see the number, it's on the opposite side and is etched exactly the same and at the same time as the weight code, if ones there they should both be there. If you finally see the number there are usually only 2 possible colours that fit. Sometimes 3 if it's a 400 but not 100% sure of that without looking. Unless the shell spins the size of the conrod opening never changes.
Shell markings mean absolutely nothing, the last thing done to them is measure them and allocate a colour code after machining
If you are absolutely certain the pins are all the same size use the shells from the marked rod that you know the colour of in the unmarked rods with plastigauge and see what the clearance alters too
Ted, Take conrod 1 and get a plastigauge reading with its shells on its pin, then put those shells in an unmarked rod and check again on the same pin if clearance goes up rod has bigger hole if down smaller hole if same its same size
2nd pic is wrong part of the crank.3rd pic looks right, try wetting it with petrol and checking then, I can almost see the markings but can’t make them out enough to read them.
Oddjob,where would the markings be on the crank as I cant see any on mine so I 'm guessing they are faint but i do not have a clue what area they are in
Yes I can see them Ted.I was spot on saying number 1 would be A and number 4 would be B. I'm 99% sure the colour for 2 and 3 is green as well Ted, I'm thinking that number 2 rod is 2 and number 3 is a 3. Bryan is perfectly correct in saying that the shell markings are meaningless except yours are all the same, that means when the guy in the factory went to fit the shells he's almost certainly gone to the same box for them all, hence why the batch number is the same.There is another way to look at it, if you fit a green in number 3 that's the thickest shell listed for a conrod marked A and number 2 is marked B and the green shell sits right in the middle of the selection choice. They used to say you could go up or down a shell size but better to go up than down.You can check of course but I'd be happy to say fit a set of Greens if your fitting new.