Bearing shell selection question

[MexicanGringo]

Hi All, replacing my crank bearings and a bit confused at the selection.Haynes says match the crank web no with the upper crankcase mark for each journal, in my case giving two yellows, a brown & a green. However if you look at a parts breakdown http://www.akhara.com/nc30/nc30parts/files/13.htm the inner shells have a diff part no. to the outer shells and the part quantity for each is 4, so are they saying replace outer shells all as the same colour, and then inner shells all as the same colour, or do you replace shells in sets of 2 depending on the crankshaft & case marks, as haynes suggests?

[NC35!]

Honda have recently discontinued certain shell bearing part numbers, and are now selling alternates in their place. I would heartily recommend you contact Rick Oliver for help and advice on this - I know he will sort you exactly what you need for your code marking appropriately.

Thanks

[MexicanGringo]

Cheers, i think rick occasionally passes by this forum,lending morsels of magnificence, very occasionally...

[RickOliver]

Yeah, I heard a rumour to that effect too...

The quick answer is that you make your shell selection for each individual journal based on the appropriate number/letter markings.

The bearing shells which have been discontinued are some of the big end ones - the original parts list specified different shells for the front and rear cylinder connecting rods, now they all use the same part numbers.

Happy to advise/supply - you know where to find me... (occasionally!)

Rick

[fourfingers]

Just to add a little confusion... main bearing selection chart in the honda nc30 workshop manual is not correct. Think I got this chart from a post( Mike Norman´s) at the old forum.

[MexicanGringo]

oh cock, is this different to the table in haynes? Bought mine based on that

[fourfingers]

This is the "Corrected" version of the Honda workshop manual (not the Haynes). The original Honda workshop manual is wrong. If you use this chart and get the same results as you did with haynes, then Haynes is correct.

[fourfingers]

Here is a cad drawing from the different diameters (case- crank), just to check sizes

[vfrman]

Hi All, replacing my crank bearings and a bit confused at the selection.Haynes says match the crank web no with the upper crankcase mark for each journal, in my case giving two yellows, a brown & a green. However if you look at a parts breakdown http://www.akhara.com/nc30/nc30parts/files/13.htm the inner shells have a diff part no. to the outer shells and the part quantity for each is 4, so are they saying replace outer shells all as the same colour, and then inner shells all as the same colour, or do you replace shells in sets of 2 depending on the crankshaft & case marks, as haynes suggests?

Well to answer the question... the parts diagram is just saying that you need 4 ea of the inner and 4 ea of the outer. When you order bearing shells, you only get one half per bag, so you need 2 shells per bearing surface. When you place your order, get the correct color, 4 yellow, 2 brown and 2 green. The inner/outer shells differ in the size of the oil passages, so be sure you get the correct ones.

The old crankpin shells that were front/rear specific were that way because there was only one hole for the oil passage that goes up the conrod. Honda just superceded that shell with one with two holes, so you don't have to worry about messing that up.

Hope this is clear as mud. :D

[MexicanGringo]

Crackcases already back together! Haynes is the same as orig honda manual.. Fourfingers how did you find this corrected table&CAD drawing? So iv got a set of 1.495 bearings instead of 1.503, how much diff does having more oil clearance make, assuming the other journals are correct? Cant believe it i think i need to sue someone