C4.4 (Mech) Industrial Engine Caterpillar

Illustration 1	g00918708

The drive gear on the fuel injection pump is retained by a tapered shaft and a nut. Tighten the nut to the following torque 24 N·m (18 lb ft). Release the lock on the fuel pump shaft. Torque the nut to the following torque. ... 90 N·m (66 lb ft)

(1) Fuel injection pump drive gear

Bore diameter of the fuel injection pump drive gear ... 36.00 to 36.06 mm (1.1809 to 1.1819 inch)

Clearance between the fuel injection pump drive gear and the drive gear hub ... 0.003 to 0.075 mm (0.0001 to 0.0050 inch)

Number of teeth ... 68

(2) Camshaft gear

Tighten the bolt for the camshaft gear to the following torque. ... 95 N·m (70 lb ft)

Bore diameter of the camshaft gear ... 34.93 to 34.95 mm (1.3750 to 1.3760 inch)

Outside diameter of the camshaft hub ... 34.90 to 34.92 mm (1.3741 to 1.3747 inch)

Clearance between camshaft gear and camshaft hub ... 0.003 to 0.048 mm (0.0001 to 0.0019 inch)

Number of teeth ... 68

(3) Idler gear and hub

Tighten the bolts for the idler gear to the following torque. ... 44 N·m (33 lb ft)

Bore diameter of the idler gear ... 57.14 to 57.18 mm (2.2495 to 2.2512 inch)

Bore diameter of the idler gear with roller bearings ... 72.35 to 72.36 mm (2.8484 to 2.8488 inch)

Width of idler gear and split bearing assembly ... 30.14 to 30.16 mm (1.186 to 1.187 inch)

Inside diameter of idler gear bearings with flanges ... 50.78 to 50.80 mm (1.999 to 2.000 inch)

Outside diameter of idler gear hub ... 50.70 to 50.74 mm (1.9961 to 1.9976 inch)

Outside diameter of idler gear hub with roller bearings ... 49.975 to 49.988 mm (1.9675 to 1.9680 inch)

Clearance of idler gear bearing on hub ... 0.04 to 0.10 mm (0.0016 to 0.0039 inch)

Idler gear end play ... 0.10 to 0.20 mm (0.004 to 0.008 inch)

Idler gear end play with roller bearings ... 0.10 to 0.75 mm (0.0039 to 0.0295 inch)

Maximum permissible end play ... 0.38 mm (0.015 inch)

Number of teeth ... 73

Illustration 2	g00918756

(4) Crankshaft gear

Bore diameter of crankshaft gear ... 47.625 to 47.650 mm (1.8750 to 1.8760 inch)

Outside diameter of crankshaft hub ... 47.625 to 47.645 mm (1.8750 to 1.8758 inch)

Clearance of gear on crankshaft ... −0.020 to +0.020 mm (−0.0008 to +0.0008 inch)

Number of teeth ... 34

(5) Oil pump idler gear

Inside diameter of oil pump idler gear bearing ... 22.22 to 22.26 mm (0.875 to 0.876 inch)

Outside diameter of oil pump idler gear shaft ... 22.19 to 22.21 mm (0.873 to 0.874 inch)

Clearance of oil pump idler gear bearing on shaft ... 0.024 to 0.030 mm (0.0009 to 0.0012 inch)

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

Backlash values

Backlash between drive gear and idler gear of balancer (if equipped) ... 0.097 to 0.170 mm (0.0038 to 0.0066 inch)

Backlash between idler gear and oil pump drive gear ... 0.046 to 0.106 mm (0.0018 to 0.0041 inch)

Backlash between oil pump idler gear and crankshaft gear ... 0.095 to 0.160 mm (0.0037 to 0.0063 inch)

Backlash between the idler gear and the crankshaft gear ... 0.064 to 0.124 mm (0.0025 to 0.0049 inch)

Backlash between camshaft gear and idler gear ... 0.052 to 0.107 mm (0.0020 to 0.0042 inch)

Backlash between fuel injection pump gear and idler gear ... 0.054 to 0.109 mm (0.0021 to 0.0043 inch)

Backlash between water pump gear and fuel injection pump gear ... 0.073 to 0.133 mm (0.0028 to 0.0052 inch)