New Holland SmartTrax T8.320 Service Manual page 39

Connecting Rods
Connecting rods must all be the same weight class in an
engine. The weight class is identified by a color swatch
on the connecting rod.
There are three classes of crankshaft bearing diameters
(bore size) on the connecting rod. The bore size is marked
by a color code on the rod. The oil clearance is deter-
mined by the connecting rod bore size and the crankshaft
journal size. Based on connecting rod bore diameter and
the crankshaft journal diameter a bearing set must be de-
termined.
Connecting rods are the fracture split type. Care must be
taken when handling these rods as any damage to the
cap/rod mating area requires that the rod be replaced.
Connecting rod
weight, class and
color
3450 – 3470 grams
Grade A, Yellow
3471 – 3490 grams
Grade B, Green
3491 – 3510 grams
Grade C, Blue
Fracture split rods give nearly perfect alignment. In both
examples the red (rod) profiles are identical as are the
blue (cap) profiles. In the top example the rod fits perfectly
with the cap. In the lower example the rod is in the same
position but the cap is reversed, here the material peaks
align peak to peak and keeps cap from mating with the
rod.
Engine - Engine and crankcase
Bore diameter and color
designation
85.987 - 58.996 Yellow
85.997 - 86.005 Green
86.006 - 86.013 Blue
85.987 - 58.996 Yellow
85.997 - 86.005 Green
86.006 - 86.013 Blue
85.987 - 58.996 Yellow
85.997 - 86.005 Green
86.006 - 86.013 Blue
47917992 25/09/2015
10.1 [10.001] / 12
16
RAIL15TR00397CA
17
RAIL15TR00375AA