SOHC.co.uk Forums > CB350/400

Not fully understanding Big End Bearings & colour codes.

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Bryanj:
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

McCabe-Thiele (Ted):

--- Quote from: Bryanj on May 02, 2021, 10:56:38 PM ---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

--- End quote ---
Hi Bryan,
I am slightly confused by your comments about the pin sizes  as conrod 1 is marked 3 and conrod 4 is marked two I assume these are the pin size as its an etched marking like the weight codes? Different pin sizes but the same Green shells are fitted in two of my conrods. In the absence of the two missing pin conrod numbers as I see it this is my only option to work out what the bearing codes are.
If the clearance changes it might give me a clue as to where to go next. Plan B is to keep the original shells throughout as the engine didn't rattle when I ran it last year.

waffey:
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

Bryanj:
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

McCabe-Thiele (Ted):

--- Quote from: Bryanj on May 03, 2021, 09:46:47 AM ---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

--- End quote ---

Thanks Bryan,  Yes in my elongated  way of explaining that is my plan - just waiting for the Plasigauge  to arrive - the last batch of Green were the wrong size range completely. Ash put me on the right path via a PM.

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