C4.4 Industrial Engine Caterpillar

Illustration 1	g01857156
Gear train

(1) Camshaft gear

Torque for the 8.8 graded bolt for the camshaft gear ... 95 N·m (70 lb ft)

Torque for the 10.9 graded bolt for the camshaft gear ... 120 N·m (89 lb ft)

Number of teeth ... 72

(2) Idler gear and hub

Torque for the bolts for the idler gear ... 44 N·m (33 lb ft)

Width of medium duty and heavy duty idler gear bearing ... 25.45 to 25.55 mm (1.00197 to 1.00590 inch)

Inside diameter of medium duty and heavy duty idler gear bearings ... 56.00 to 56.03 mm (2.20472 to 2.20590 inch)

Outside diameter of medium duty and heavy duty idler gear hub ... 55.95 to 55.97 mm (2.20275 to 2.20354 inch)

Clearance of medium duty and heavy duty idler gear bearing on hub ... 0.03 to 0.08 mm (0.00118 to 0.00315 inch)

The end play of the medium duty and heavy duty idler gear ... 0.05 to 0.15 mm (0.00197 to 0.00591 inch)

Number of teeth ... 97

(3) Fuel injection pump drive gear

Torque for the nut ... 64 N·m (47 lb ft)

Number of teeth ... 36

(4) Oil pump gear

The number of teeth on the oil pump gear ... 21

Backlash values

Backlash between the oil pump idler gear (5) and the oil pump drive gear (4) ... 0.05 to 0.20 mm (0.00197 to 0.00787 inch)

Backlash between the oil pump idler gear (5) and the crankshaft gear (6) ... 0.025 to 0.120 mm (0.00098 to 0.00472 inch)

Backlash between the idler gear (2) and the crankshaft gear (6) ... 0.025 to 0.150 mm (0.00098 to 0.00591 inch)

Backlash between the camshaft gear (1) and the idler gear (2) ... 0.025 to 0.150 mm (0.00098 to 0.00591 inch)

Backlash between the fuel injection pump gear (3) and the idler gear (2) ... 0.05 to 0.23 mm (0.00197 to 0.00906 inch)

Backlash between the water pump gear (not shown) and the fuel injection pump gear (3) ... 0.025 to 0.200 mm (0.00098 to 0.00787 inch)

Backlash between the power take-off drive (if equipped) and the idler gear (2) ... 0.05 to 0.250 mm (0.0020 to 0.0098 inch)

(5) Oil pump idler gear

Inside diameter of oil pump idler gear bearing ... 16.012 to 16.038 mm (0.6304 to 0.6314 inch)

Outside diameter of oil pump idler gear shaft ... 15.966 to 15.984 mm (0.6286 to 0.6293 inch)

Clearance of oil pump idler gear bearing on shaft ... 0.028 to 0.072 mm (0.0011 to 0.0028 inch)

End play of the oil pump idler gear ... 0.050 to 0.275 mm (0.0019 to 0.0108 inch)

End play of the oil pump drive gear ... 0.005 to 0.090 mm (0.00020 to 0.00354 inch)

(6) Crankshaft gear

Bore diameter of crankshaft gear ... 51.00 to 51.03 mm (2.0079 to 2.0091 inch)

Outside diameter of crankshaft hub ... 51.021 to 51.002 mm (2.0087 to 2.0079 inch)

Clearance of gear on crankshaft ... −0.021 to +0.028 mm (−0.00083 to 0.00110 inch)

Number of teeth ... 36