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

The mating surfaces of the connecting rod are produced by hydraulically fracturing the forged connecting rod.

(1) Tighten the setscrews for the connecting rod to the following torque. ... 40 N·m (30 lb ft)

Tighten the setscrews for the connecting rod for an additional 120 degrees. The setscrews for the connecting rod (1) must be replaced after this procedure.

Note: Always tighten the connecting rod cap to the connecting rod, when the assembly is out of the engine. Tighten the assembly to the following torque 15 N·m (133 lb in).

(A) The bearing shell for the connecting rod must be aligned equally from both ends of the connecting rod.

(2) The bearing shell for the connecting rod

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Table 1
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
Typical example

(B) Diameter of the bore for the piston pin ... 43.01 to 43.04 mm (1.693 to 1.694 inch)

(D) Diameter for the bore for the connecting rod bearing ... 72.045 to 72.058 mm (2.8364 to 2.8369 inch)

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Illustration 4	g01356360
Typical example

Connecting rods are color coded. The color code is a reference for the length (Y) of the connecting rod. Refer to table 1 for the different lengths of connecting rods.

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Table 2
Length Grades for Connecting Rods
Grade Letter	Color Code	Length (Y)
R	Red	163.310 mm (6.4295 inch) to 163.343 mm (6.4308 inch)
O	Orange	163.264 mm (6.4277 inch) to 163.297 mm (6.4290 inch)
W	White	163.219 mm (6.4259 inch) to 163.252 mm (6.4272 inch)
G	Green	163.173 mm (6.4241 inch) to 163.206 mm (6.4254 inch)
P	Purple	163.127 mm (6.4223 inch) to 163.160 mm (6.4236 inch)
B	Blue	163.081 mm (6.4205 inch) to 163.114 mm (6.4218 inch)