C3.4B Engines for Caterpillar Built Machines Caterpillar

Illustration 1	g02659957
Typical example

(1) Fuel injection pump drive gear

Initial torque for the nut ... 18 N·m (13 lb ft)

Final torque for the nut ... 80 N·m (59 lb ft)

Number of teeth ... 24

(2) Idler gear

Torque for the bolt for the idler gear ... 75 N·m (55 lb ft)

Width of idler gear and bearing assembly ... 20.8 mm (0.81890 inch)

Inside diameter of idler gear bearings ... 36.990 to 37.075 mm (1.45630 to 1.45964 inch)

Outside diameter of idler gear hub ... 36.950 to 36.975 mm (1.45472 to 1.45571 inch)

Clearance of idler gear bearing on hub ... 0.015 to 0.125 mm (0.00059 to 0.00492 inch)

The end play of the idler gear ... 0.3 to 0.483 mm (0.01181 to 0.01902 inch)

Number of teeth ... 31

(4) Camshaft gear

Torque for the bolts for the camshaft gear ... 25 N·m (18 lb ft)

Number of teeth ... 72

(5) Crankshaft gear

Bore diameter of crankshaft gear ... 50.88 to 50.92 mm (2.00315 to 2.00472 inch)

Outside diameter of crankshaft hub ... 50.984 to 51.000 mm (2.00724 to 2.00787 inch)

Clearance of gear on crankshaft ... 0.06 to -0.12 mm (0.00236 to -0.00472 inch)

Number of teeth ... 36

(6) Oil pump idler gear

Inside diameter of oil pump idler gear bearing ... 16.012 to 16.043 mm (0.63039 to 0.63161 inch)

Outside diameter of oil pump idler gear shaft ... 15.987 to 16.000 mm (0.62941 to 0.62992 inch)

End play of the oil pump idler gear ... 0.05 to 0.15 mm (0.00197 to 0.00591 inch)

(7) Oil pump gear

Inside diameter of oil pump gear bearing ... 15.932 to 15.957 mm (0.62724 to 0.62823 inch)

Outside diameter of oil pump gear shaft ... 15.987 to 16.013 mm (0.62941 to 0.63043 inch)

End play of the oil pump gear ... 0.05 to 0.15 mm (0.00197 to 0.00591 inch)

Backlash values

Backlash between the fuel injection pump gear (1) and the idler gear (2) ... 0.07 to 0.17 mm (0.00276 to 0.00669 inch)

Backlash between the idler gear (2) and the accessory drive gear (if equipped) (3) ... 0.07 to 0.17 mm (0.00276 to 0.00669 inch)

Backlash between the idler gear (2) and the camshaft gear (4) ... 0.07 to 0.17 mm (0.00276 to 0.00669 inch)

Backlash between the camshaft gear (4) and the crankshaft gear (5) ... 0.07 to 0.17 mm (0.00276 to 0.00669 inch)

Backlash between the crankshaft gear (5) and the oil pump idler gear (6) ... 0.07 to 0.17 mm (0.00276 to 0.00669 inch)

Backlash between the oil pump idler gear (6) and the oil pump gear (7) ... 0.07 to 0.17 mm (0.00276 to 0.00669 inch)