SOHC.co.uk Forums > CB750
CB750K7 Big End shell bearing identification
Bryanj:
Shells are colour coded no matter what country they are for but after a time in the engine thay all look the same, there is a picture in the manual showing where the ID mark is on both crank and rod, plus a weight mark
ginger_jim:
Hi, the number looks like it should be traversing the two halfs of the conrod but I cant see anything legible so I can only assume that they have worn off over time. Its not the end of the world - as mentioned in the previous thread SEP in Derby will measure everything up for me and source new shells including the mains. A bit more expense but at least ill be sure that everything is 100%.
Cheers
ginger_jim:
Thanks oddjob, i did use a bit of WD40 to try and clean but didnt have much luck. Following all the posts ill try again - this is my first SOHC as I have traditionally worked on big Z's and oil head BMW's so its all a bit new. Just to double check, the main bearing marks are lightly engraved/scratched onto a crank lobe right? Looks like 5 b's - does that sound right?
Bryanj:
Yes the crank is etched on a centre lobe for both the big ends and the mains so make sure you get the correct marks. From memory i thought the rods were etched the same way, if its a very early engine the marks were in japanese characters just to confuse you.
There should be on the US site all the Honda Service Bulletins and you want Number 14.
If i have done it right this link should take you to it
http://manuals.sohc4.net/CB750SB/750_14.pdf
bytio:
I had the same issue on my F2 unable to read the crankshaft numbers so sent it all to SEP Kegworth, excellent job if you don't mind waiting a while, crank deep cleaned, all new big end and main bearing shells. All returned sealed bags and pre lubed.
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