C6.6 Industrial Engine Caterpillar

Connecting Rod

Usage:

C6.6 666

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Illustration 1	g01333876
Typical example

(1) The bearing shell for the connecting rod

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Table 1
Thickness of Connecting Rod Bearing at the Center	1.994 mm to 2 mm (0.0785 inch to 0.0787 inch)
Thickness of Connecting Rod Bearing for the Cap at the Center	1.994 mm to 2 mm (0.0785 inch to 0.0787 inch)
Bearing Clearance	0.025 mm to 0.070 mm (0.0010 inch to 0.0028 inch)

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Table 2
Undersized Connecting Rod Bearing
0.25 mm (0.010 inch)
0.51 mm (0.020 inch)
0.76 mm (0.030 inch)

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

(2) Tighten the setscrews for the connecting rod to the following torque. ... 18 N·m (13 lb ft)

Tighten the Bi-Hex setscrews for the connecting rod again to the following torque. ... 70 N·m (52 lb ft)

Tighten the Bi-Hex setscrews for the connecting rod for an extra 120 degrees. The setscrews for the connecting rod (2) must be replaced after this procedure.

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

Tighten the Torx setscrews for the connecting rod for an extra 120 degrees. The setscrews for the connecting rod (2) 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 20 N·m (14 lb ft).

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Illustration 2	g01333883
Typical example

(3) Diameter of the finished bore for the piston pin ... 39.738 mm to 39.723 mm (1.5645 inch to 1.5639 inch)

(4) Distance between the parent bores ... 219.05 mm to 219.1 mm (8.6240 inch to 8.6260 inch)

(5) Diameter for the finished bore for the connecting rod bearing ... 72.025 mm to 72.05 mm (2.8356 inch to 2.8366 inch)

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Illustration 3	g00915056

Connecting rods are color coded. The color code is a reference for the length (Y) of the connecting rod. Refer to table 3 for the different lengths of connecting rods.

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Table 3
Length Grades for Connecting Rods
Grade Letter	Color Code	Length (Y)
F	Red	161.259 mm to 161.292 mm (6.3488 inch to 6.3501 inch)
J	Green	161.183 mm to 161.216 mm (6.3458 inch to 6.3471 inch)
L	Blue	161.107 mm to 161.140 mm (6.3428 inch to 6.3441 inch)