C3.3 Industrial Engine Caterpillar

The C3.3 mechanical engine may use two types of fuel injection pump. The fuel injection pump may be a Delphi 210 fuel injection pump or a Delphi 310 fuel injection pump.

Illustration 1	g00995886
Gear train

(1) Fuel injection pump drive gear

Tighten the nut to the following torque. ... 24 N·m (18 lb ft)

Release the lock on the fuel injection pump shaft. Torque the nut to the following torque. ... 90 N·m (66 lb ft)

Number of teeth ... 68

Note: Refer to Specifications, "Fuel Injection Pump" for the locking torque for the fuel injection pump shaft.

(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 ... 34.92 to 34.95 mm (1.3748 to 1.3760 inch)

Outside diameter of the camshaft hub ... 34.90 to 34.92 mm (1.3741 to 1.3747 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 ... 57.137 to 57.175 mm (2.2495 to 2.2510 inch)

Bore diameter of the idler gear with roller bearings ... 72.345 to 72.364 mm (2.8482 to 2.8490 inch)

Width of idler gear and split bearing assembly ... 30.135 to 30.165 mm (1.186 to 1.188 inch)

Inside diameter of idler gear bearings with flanges ... 50.797 to 50.818 mm (1.9999 to 2.0007 inch)

Outside diameter of idler gear hub ... 50.716 to 50.737 mm (1.9967 to 1.9975 inch)

Outside diameter of idler gear hub with roller bearings ... 59.100 to 59.115 mm (2.3268 to 2.3274 inch)

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

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

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

Number of teeth ... 73

Illustration 2	g00996214
The gear train for the oil pump

(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 +0.025 mm (−0.0008 to +0.0010 inch)

Number of teeth ... 34

(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)

(6) Oil pump gear

The number of teeth on the oil pump gear ... 17

Backlash values

Backlash between the idler gear (5) and the oil pump drive gear (6) ... 0.046 to 0.106 mm (0.0018 to 0.0041 inch)

Backlash between the oil pump idler gear (5) and the crankshaft gear (4) ... 0.095 to 0.160 mm (0.0037 to 0.0063 inch)

Backlash between the idler gear (3) and the crankshaft gear (4) ... 0.064 to 0.124 mm (0.0025 to 0.0049 inch)

Backlash between the camshaft gear (2) and the idler gear (3) ... 0.052 to 0.107 mm (0.0020 to 0.0042 inch)

Backlash between the fuel injection pump gear (1) and the idler gear (3) ... 0.054 to 0.109 mm (0.0021 to 0.0043 inch)

Backlash between the water pump gear (not shown) and the fuel injection pump gear (1) ... 0.073 to 0.133 mm (0.0028 to 0.0052 inch)

Backlash between the power take-off drive (if equipped) and the idler gear (3) ... 0.112 to 0.172 mm (0.0044 to 0.0068 inch)