SOHC.co.uk Forums > CB350/400

Crank Finally Measured by Engineering Firm but I'm confused

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McCabe-Thiele (Ted):
Fwiw if the old shell colour codes have gone and you can't find any markings on the crank my view as a relative novice is try to get hold of a middle of the road shell say Green - fit them and do a Plastigauge measurement - depending on the reading go for a shell that gives you the require clearance/oil film thickness. I was luck as I found Green paint on one main shell and Green on two big end shells so it gave me a starting point.

waffey:
Thanks K2-K6

bare with me please.

no colour on shells or crank. big end case states BBBCB. assume this is still ok to buy and use.

So i'm going to take the 3 conrods back and get them measured

The conrod table to me looks like it includes the bearing as it's 32 (-0.010 -0.020) as an example, mine are around the 32.

so conrod 4 (32.089 - crank 31.984 = 0.895 then dive by 2 = 0.4475) so i can use C

should of listen in school!

waffey:
Ted,

great idea, buy one shell green, fit, torque up with plastigauge then measure, move along to the next one.

assume this is what you mean?

Bryanj:
Why only 3rods? They come with balanced weight codes as a set

K2-K6:
If the crankcase codes are in the same orientation as the way the crankshaft is noted in the photo, then the shell colours should be;- left to right as photo brown brown green black brown.

Thats for the main crankshaft bearings as it spins in the crankcase.

The 3 rods look like they noted the 4th with "no lining" so three measured with shells in place, and one without as I read the notes from measuring.

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