C7.1 Engines for Caterpillar Built Machines Caterpillar

Illustration 1	g01332521
Typical example

(1) Fuel injection pump drive gear

Tighten the nut to the following torque. ... 160 N·m (118 lb ft)

Number of teeth ... 68

(2) Camshaft gear

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

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)

Width of idler gear and split bearing assembly ... 30.164 to 30.135 mm (1.1876 to 1.1864 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)

Clearance of idler gear bearing on hub ... 0.06 to 0.102 mm (0.0024 to 0.0040 inch)

Idler gear end play ... 0.10 to 0.205 mm (0.0039 to 0.0081 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 ... 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 ... −0.020 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 ... 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) ... 0.05 to 0.15 mm (0.0020 to 0.0059 inch)

Backlash between the oil pump idler gear (5) and the crankshaft gear (4) ... 0.08 to 0.23 mm (0.0031 to 0.0091 inch)

Backlash between the idler gear (3) and the crankshaft gear (4) ... 0.05 to 0.15 mm (0.0020 to 0.0059 inch)

Backlash between the camshaft gear (2) and the idler gear (3) ... 0.05 to 0.15 mm (0.0020 to 0.0059 inch)

Backlash between the fuel injection pump gear (1) and the idler gear (3) ... 0.05 to 0.15 mm (0.0020 to 0.0059 inch)

Backlash between the water pump gear (not shown) and the fuel injection pump gear (1) ... 0.05 to 0.15 mm (0.0020 to 0.0059 inch)

Backlash between the power take-off drive ( if equipped) and the idler gear (3) ... 0.05 to 0.250 mm (0.0020 to 0.0098 inch)