SOHC.co.uk Forums > CB750
Crankshaft bearing selection bulletins/ADVICE NEEDED
AshimotoK0:
--- Quote from: Oddjob on June 24, 2015, 01:55:56 PM ---I was told it would be OK to use the colour either up or down a size without any detriment, as green is next to yellow in the sizing chart that should be ok Ash, just run it in nice and easy.
Funny how Honda told everyone to ignore these "Production marks" in the workshop manuals but then issued bulletins like these which made a mockery of that statement.
--- End quote ---
Cheers mate .. I suppose greens will be slightly tighter so should bed in nice. What do you apply to bearing surface when you Plastigage and during assembly? Big ends next .. all my 13 big end shells NOS are yellow but I reckon I need 3 sets of yellow and one green. So at worst will only have to buy two shells and at least the big end ones are slightly cheaper. What's the cheapest place?
Also I have three NOS, but not bagged, big end shells that look like they are marked green on the side (lime green) but when I compare them with a bagged NOS and previously sealed one, with Honda label 13218-300-013 in the packet, they too have the same colour paint (well more like lacquer) but they are supposed to be coded yellow (described as 'bearing D'). Any idea how green the green should be cw yellow?
Ash
Bryanj:
Glad that crank was OK mate, bugger to post tho' I am certain you will be OK with what you suggested just when built remember higher revs are better than "Lugging" the engine and change oil every 500 for 3 times
Bryanj:
I will be contraversial and say that if i am building an engine that is to sit for a while before use i have always used coppaslip (original version) turns the oil FUNNY COLOUR BUT NEVER HAD ANY PROBLEMS ON ALL THE hONDA AND eSSEX v6 THAT I BUILT
Bryanj:
Got from my Uncle who ran a real garage way back when, didn't mean to shout its this damn dyslexic keyboard that does wierd things when the batteries get low
AshimotoK0:
So do I Plastigage or not given that I am pretty sure my measurements were spot on as the guy that measured them is an old engineering 'sage' from the NEL ?
Must admit that the old SOHC four crank (a 400/4) I ever fitted new shells to, I didn't Plastigage and it was fine (the 400/4 crank and shells on my current 400/4 looked so nice I just left well alone and refitted).
Having said this the Honda shop manual specifically tells you to Plastigage and not to rely on measurements.
Ash
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