I've been reading many old threads about this subject, but still feel a little uneasy with some things, so hopefully some of you can help....

So, I have my motor apart and found that the codes stamped on the crank and block match up as 3D, 3D, 3C, 3D, and 3D. (black, black, brown, black, black seems simple enough. Anyway my question regarding that is do most of you usually plastigage with the old bearings and then if they are still in spec, buy the new bearing in the same color, or is is better to plastigage with brand new bearings.

Now the clearances on the itr rods are a little bit more confusing to me. All of my rods are stamped 23, but I can't find a chart in the helms that is similar to the chart for the B1 and C1 motors. Maybe I'm missing it, but I also can't find the letters or bars that are supposedly marked on the crank that correspond to the rods. Any help would be appreciated, thanks.

Oh, and the motor had around 30,000 on it if that helps at all....

 

ANYONE??

 

bump for ya

 

To calculate actual bearing clearance, use the following formula:
BC = IDBT – ODC – (2 x BT)

BC = bearing clearance
IDBT = inside diameter of bearing tunnel (housing bore)
ODC = outside diameter of crank journal
BT = bearing thickness

Main Bearing thickness by color
Blue 2.013-2.010 mm 0.0793”- 0.0791”
Black 2.010-2.007 mm 0.0791”- 0.0790”
Brown 2.007-2.004 mm 0.0790”- 0.0789”
Green 2.004-2.001 mm 0.0789”- 0.0788”
Yellow 2.001-1.998 mm 0.0788”- 0.0787”
Pink 1.998-1.995 mm 0.0787”- 0.0785”
Red 1.995-1.992 mm 0.0785”- 0.0783”

Rod bearing thickness by color
Blue 1.510-1.507 mm 0.0594”- 0.0593”
Black 1.507-1.504 mm 0.0593”- 0.0592”
Brown 1.504-1.501 mm 0.0592”- 0.0591”
Green 1.501-1.498 mm 0.0591”- 0.0590”
Yellow 1.498-1.495 mm 0.0590”- 0.0589”
Pink 1.495-1.492 mm 0.0589”- 0.0587”
Red 1.492-1.489 mm 0.0587”- 0.0586”


Mains are the same for all Bseries

Here is the C5 rod bearing chart:

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92TypeR &raquo;</TD></TR><TR><TD CLASS="quote">To calculate actual bearing clearance, use the following formula:
BC = IDBT – ODC – (2 x BT)

BC = bearing clearance
IDBT = inside diameter of bearing tunnel (housing bore)
ODC = outside diameter of crank journal
BT = bearing thickness

Main Bearing thickness by color
Blue 2.013-2.010 mm 0.0793”- 0.0791”
Black 2.010-2.007 mm 0.0791”- 0.0790”
Brown 2.007-2.004 mm 0.0790”- 0.0789”
Green 2.004-2.001 mm 0.0789”- 0.0788”
Yellow 2.001-1.998 mm 0.0788”- 0.0787”
Pink 1.998-1.995 mm 0.0787”- 0.0785”
Red 1.995-1.992 mm 0.0785”- 0.0783”

Rod bearing thickness by color
Blue 1.510-1.507 mm 0.0594”- 0.0593”
Black 1.507-1.504 mm 0.0593”- 0.0592”
Brown 1.504-1.501 mm 0.0592”- 0.0591”
Green 1.501-1.498 mm 0.0591”- 0.0590”
Yellow 1.498-1.495 mm 0.0590”- 0.0589”
Pink 1.495-1.492 mm 0.0589”- 0.0587”
Red 1.492-1.489 mm 0.0587”- 0.0586”


Mains are the same for all Bseries

Here is the C5 rod bearing chart:
</TD></TR></TABLE>

good info, do you have the info for an LS bottom end? thanks.

 

Thanks 92typeR, for some reason I couldn't find that chart in my manual (only the other B-series motors). It seems as though the mix and match colors on the rods?? If I'm remembering right, they don't mix and match on the mains right?? Does it matter what side of the rod the colors go on??