So I'm in the process of building a new engine, and I wanted to order some stuff at work today but couldn't because I forgot to bring my FSM and parts manual... so I figured as long as I'm doing this work, I should probably make it available to everyone. This info is for the DOHC, but I believe it's very likely the same for the SOHC G13's...
First of all, how to determine what main journal bearings were placed in your engine from the factory. The assembly line workers selected bearings based on the crank journal diameter and the bearing cradle diameter. These dimensions were measured earlier on in the process and measurement codes were stamped on the block and crank.
The block notation can be found on the oil pan mounting surface. It will be a series of letters, for example "BCBBB" (first letter for the bearing closest the the crank pulley). The crank notation can be found on the cylinder one counterweight, for example "23222" (again, the first number is for the bearing closest to the crank pulley). The measurments are as follows (but not really important):
The bearing used is then looked up in the following table:
1 2 3
A Green Black -
B Black - Yellow
C - Yellow Blue
*I should note that the "-" designation means no color is assigned (the bearings have paint markings on them to make it easier to identify them).
So, now the information for the bearings themselves:
Color Thickness P/N
Grean 1.996-2.000mm 12340-82000-0A0
Black 1.999-2.003mm 12340-82000-0B0
- 2.002-2.006mm 12340-82000-0C0
Yellow 2.005-2.009mm 12340-82000-0D0
Blue 2.008-2.012mm 12340-82000-0E0
And there you have it. When I rebuild, I tend to buy the original bearing size and the next thicker, just in case.... The last engine I built was dead on to the clearances I wanted (as checked with plastigage) with the original bearing sizes.
Finally, just as an FYI, here are the thrust bearing part numbers:
12300-82820 Bearing Set, crank thrust (STD, T:2.5)
12300-82820-012 Bearing Set, crank thrust (OS:0.125, T:2.563)