3054 and 3056 Industrial and Generator Set Engines Caterpillar

Illustration 1	g00636808

Naturally Aspirated Engines

(1) Inside diameter of connecting rod for the piston pin bearing ... 38.89 to 38.92 mm (1.531 to 1.532 inch)

(2) Outside diameter of piston pin bearing ... 38.94 to 39.03 mm (1.535 to 1.536 inch)

Inside diameter of piston pin bearing after reaming ... 34.94 to 34.96 mm (1.376 to 1.377 inch)

Clearance between piston pin bearing and piston pin ... 0.020 to 0.043 mm (0.001 to 0.002 inch)

(3) Distance between center of piston pin and center of connecting rod bearing bore ... 219.05 to 219.10 mm (8.624 to 8.626 inch)

(4) Connecting rod bearings are available for remachined journals of the crankshaft which have the following undersize dimensions:

0.25 mm (0.010 inch)

0.51 mm (0.020 inch)

0.76 mm (0.030 inch)

Shell thickness ... 1.835 to 1.842 mm (0.0723 to 0.0725 inch)

Width of connecting rod bearing ... 31.62 to 31.88 mm (1.245 to 1.255 inch)

Bearing clearance ... 0.035 to 0.081 mm (0.0014 to 0.0032 inch)

(5) Inside diameter of connecting rod for connecting rod bearing ... 67.21 to 67.22 mm (2.646 to 2.647 inch)

(6) Connecting rod cap with nuts and bolts

Tighten the nuts for the connecting rod cap to the following torque. ... 125 N·m (92 lb ft)

Connecting rod cap with bolts only

Tighten the bolts for the connecting rod cap to the following torque. ... 155 N·m (114 lb ft)

Turbocharged Engines

(1) Inside diameter of connecting rod for the piston pin bearing ... 42.056 to 42.083 mm (1.655 to 1.656 inch)

(2) Outside diameter of piston pin bearing ... 42.16 to 42.19 mm (1.660 to 1.661 inch)

Inside diameter of piston pin bearing after reaming ... 38.12 to 38.14 mm (1.501 to 1.502 inch)

Clearance between piston pin bearing and piston pin ... 0.020 to 0.043 mm (0.001 to 0.002 inch)

(3) Distance between center of piston pin and center of connecting rod bearing bore ... 219.05 to 219.10 mm (8.624 to 8.626 inch)

(4) Connecting rod bearings are available for remachined journals of the crankshaft which have the following undersize dimensions:

0.25 mm (0.010 inch)

0.51 mm (0.020 inch)

0.76 mm (0.030 inch)

Shell thickness ... 1.835 to 1.844 mm (0.0723 to 0.0726 inch)

Width of connecting rod bearing ... 31.55 to 31.88 mm (1.240 to 1.255 inch)

Bearing clearance ... 0.030 to 0.081 mm (0.0012 to 0.0032 inch)

(5) Inside diameter of connecting rod for connecting rod bearing ... 67.21 to 67.22 mm (2.646 to 2.647 inch)

(6) Connecting rod cap with nuts and bolts

Tighten the nuts for the connecting rod cap to the following torque. ... 125 N·m (92 lb ft)

Connecting rod cap with bolts only

Tighten the bolts for the connecting rod cap to the following torque. ... 155 N·m (114 lb ft)

Note: If piston cooling jets are installed, the piston and the connecting rod assembly must be turned when the piston and rod assembly are installed. Turning the piston and connecting rod assembly will prevent the connecting rod from hitting and damaging the piston cooling jet. When the connecting rod has passed the piston cooling jet, turn the connecting rod until the arrow or "Front" mark on the top of the piston is toward the front of the engine.

Hydraulically Fractured Connecting Rods

Illustration 2	g01064497

Note: The caps and rods must stay together as a pair.

Note: When the connecting rods are replaced, do not reuse the connecting rod bolts. New connecting rod bolts must be used.

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

(7) Tighten the connecting rod bolts to the following torque. ... 18 N·m (13 lb ft)

Tighten the connecting rod bolts again to the following torque. ... 70 N·m (52 lb ft)

Tighten the connecting rod bolt for an extra 120 degrees.

(8) Connecting rod bearing