C4.4 Engines for Caterpillar Built Machines Caterpillar

Connecting Rod - For Use With Spheroidal Graphite Iron (SGI) Crankshaft

Usage:

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Illustration 1	g03442137
Typical Example

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Illustration 2	g01356356
Alignment of the bearing shell

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Table 1
The mating surfaces of the connecting rod are produced by hydraulically fracturing the forged connecting rod.
Callout	Quantity	Part	Specification Description
1	-	Connecting rod bolts	Use new Torx bolts (1) for this procedure. Use a Torx socket to tighten the Torx bolts to a torque of 40 N·m (30 lb ft) Tighten the Torx bolts for an additional 120 degrees. After removal of the connecting rod, reassemble the connecting rod cap to the connecting rod. Tighten the assembly to the following torque 15 N·m (133 lb in).
2	-	The bearing shell for the connecting rod
A	-	Alignment of the bearing shell	The bearing shell for the connecting rod must be aligned equally from both ends of the connecting rod. Refer to the Disassembly and Assembly Manual for information on the alignment tool.

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Table 2
Bearing Width for the Connecting Rod	31.47 mm (1.2390 inch) to 31.73 mm (1.2492 inch)
Bearing Width for the Connecting Rod Cap	31.47 mm (1.2390 inch) to 31.73 mm (1.2492 inch)
Thickness of Connecting Rod Bearing at the Center	1.995 mm (0.0785 inch) to 2.002 mm (0.0788 inch)
Thickness of Connecting Rod Bearing for the Cap at the Center	1.995 mm (0.0785 inch) to 2.002 mm (0.0788 inch)
Bearing Clearance	0.031 mm (0.0012 inch) to 0.078 mm (0.0031 inch)

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Illustration 3	g03442182

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Table 3
Connecting Rod Dimensions
Callout	Quantity	Part	Specification Description
B	-	Diameter of the bore for the piston pin	43.01 to 43.04 mm (1.693 to 1.694 inch)
C	-	Distance between bearing centers	219.05 to 219.10 mm (8.624 to 8.626 inch)
D	-	Diameter for the bore for the connecting rod bearing	72.045 mm (2.8364 inch) to 72.058 mm (2.8369 inch)

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Illustration 4	g01356360

Connecting rods are color coded. The color code is a reference for the length (Y) of the connecting rod. Refer to table 4 for the different lengths of connecting rods.

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Table 4
Length Grades for Connecting Rods
Grade Letter	Color Code	Length (Y)
F	Red	163.310 mm (6.4295 inch) to 163.343 mm (6.4308 inch)
G	Orange	163.264 mm (6.4277 inch) to 163.297 mm (6.4290 inch)
H	White	163.219 mm (6.4259 inch) to 163.252 mm (6.4272 inch)
J	Green	163.173 mm (6.4241 inch) to 163.206 mm (6.4254 inch)
K	Purple	163.127 mm (6.4223 inch) to 163.160 mm (6.4236 inch)
L	Blue	163.081 mm (6.4205 inch) to 163.114 mm (6.4218 inch)