3408C & 3412C INDUSTRIAL ENGINES Caterpillar


Front Gear Group (Timing)

Usage:

3408C

(1) Fuel injection pump drive gear and timing advance unit.

(2) Camshaft gear.

NOTE: Make alignment of "V" marks as shown.

(3) Water pump drive gear.

(4) Gear for attachment drive groups.

(5) Idler gear (balancer gear) assembly.

NOTE: Make alignment of "V" marks as shown.

(6) Tighten five bolts to a torque of ... 55 ± 7 N·m (40 ± 5 lb ft)

(7) Diameter of the shaft (new) ... 63.500 ± 0.013 mm (2.5000 ± .0005 in)

Bore in bearing (after assembly) ... 63.602 ± 0.038 mm (2.5040 ± .0015 in)

(8) End clearance (new) ... 0.31 ± 0.17 mm (.012 ± .007 in)

(9) Plate. The lubrication groove must be against the gear.

(10) Crankshaft gear.

NOTE: Make alignment of "V" mark as shown.

(11) Engine oil pump drive gear.

(12) Tighten the bolt that holds the drive gear to a torque ... 55 ± 7 N·m (40 ± 5 lb ft)

3412C

(1) Fuel injection pump drive gear and timing advance unit.

(2) Camshaft gear.

NOTE: Make alignment of "V" marks as shown.

(3) Water pump drive gear.

(4) Gear for attachment drive groups.

(5) Idler gear assembly.

NOTE: Make alignment of "V" marks as shown.

(6) Tighten five bolts to a torque of ... 55 ± 7 N·m (40 ± 5 lb ft)

(7) Diameter of the shaft (new) ... 63.500 ± 0.013 mm (2.5000 ± .0005 in)

Bore in bearing (after assembly) ... 63.602 ± 0.038 mm (2.5040 ± .0015 in)

(8) End clearance (new) ... 0.31 ± 0.17 mm (.012 ± .007 in)

(9) Plate. The lubrication groove must be against the gear.

(10) Crankshaft gear.

NOTE: Make alignment of "V" mark as shown.

(11) Distance that bearing is installed from the face of idler gear ... 1.12 ± 0.25 mm (.044 ± .010 in)

(12) Diameter of the shaft (new) ... 34.943 ± 0.013 mm (1.3757 ± .0005 in)

Bore in bearing (after assembly) ... 35.034 ± 0.038 mm (1.3793 ± .0015 in)

(13) Engine oil pump idler gear. Tighten the bolt that holds idler gear to a torque of ... 55 ± 7 N·m (40 ± 5 lb ft)

(14) Engine oil pump drive gear. Tighten the bolt that holds the drive gear to a torque ... 55 ± 7 N·m (40 ± 5 lb ft)

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