SOHC.co.uk Forums > CB500/550
CB550k1 US Import - UK registration
McCabe-Thiele (Ted):
Oh dear Ken one of my 500 Conrods (No4) is 3 all the others are 2.
Will this be an issue - presumably I could weight them individually then if 3 is heavier have it lightened ?
Oddjob:
It's the letter not the number that's the weight code Ted.
McCabe-Thiele (Ted):
--- Quote from: Oddjob on November 26, 2022, 04:46:01 PM ---It's the letter not the number that's the weight code Ted.
--- End quote ---
Heart attack averted then.
Oddjob:
The easiest way to remember to what letter and code to use is this.
The ones on the crankcase are letters, always remember that. Those are the ones stamped into the back of the bottom case usually, like BBABC. Honda would not do a letter and letter combination as there's far too much chance to get it wrong, so if the crankcase is letters then you need numbers off the crank to select the main bearings. If you remember that then it's simple to work out that the only thing left on the crank printing/stamping is the letter, so those must refer to the conrod journal. Again, must be letter/number combination so if crank is letter then rod must be number, that leaves the letter as the weight code.
If you can always remember that then working out what is what becomes so much easier.
juitz:
--- Quote from: Oddjob on November 26, 2022, 03:07:37 PM ---
--- Quote from: juitz on November 26, 2022, 12:00:25 PM ---Thanks Mick.
Looking at the manual on how to select bearing shells for Conrods, I've got:
2D, 2D, 2D, 3D
All shaft pin diameter are 34.99
I've plastigauged rod one between the cap and bearing and between bearing and pin. Both measured 0.038mm clearance.
I'm not sure where to go from here though as the manual has bearing selection based on the rod stampings and pin diametera. Can't find where in the manual the clearances come in to select the correct shell?
If I go by the manual, I need 6 brown and 2 greens.
--- End quote ---
Not sure where you've got that info from for bearing selection, there is no letter D in the bearing selection chart. Your crank markings look very clear, I can clearly see 1A on the rotor end crank webbing, the number 1 is for the crankshaft main journal, the letter A is for the conrod journal, so whatever number is printed on that conrod is what you need to check selection. The letter on the conrod is it's weight code, all the rods should have the same code so the crank is balanced.
Take a pic showing the crank markings and if possible the conrods showing the numbers printed on them, just to confirm the colour selection. Your shells look ok for re-use TBH, I'd just clean everything meticulously and refit them with some graphogen.
--- End quote ---
Apologies, I think I'm confusing things here.
The Conrods had markings on one side of "2" for pistons 1-3 and "3"on piston4. They were all marked "D" on the other side - which are the weight codes. I just typed all the info in the last post.
The crank is marked 1A at all locations.
I took some pictures of all the bearing shells for visual "assessment". I have to replace at least one conrod shell though as I scrapped it trying to roemove it.
The conrod markings are gone or just barely visible. My fault for trying to clean these up in the ultrasoniccleaner
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