3408C, 3412C and 3412D High Performance Marine Engines Caterpillar


Gear Group (Front)

Usage:

3412 3JK

3408




Illustration 1g01412703

(1) Fuel pump drive gear and timing advance unit

(2) Camshaft gear

Note: Align the "V" timing marks prior to installation.

(3) Water pump drive gear

(4) Accessory drive gear

(5) Idler gear assembly

(A) Diameter of new idler shaft ... 63.500 ± 0.013 mm (2.5000 ± 0.0005 inch)
Bore in bearing after assembly ... 63.602 ± 0.038 mm (2.5040 ± 0.0015 inch) (B) Installation depth of the bearing ... 0.38 ± 0.25 mm (0.015 ± 0.010 inch)

Note: Align the "V" timing marks prior to installation.

(6) Torque for bolts ... 55 ± 10 N·m (41 ± 7 lb ft)

Prior to assembly, lubricate the idler shaft, the bore of the shaft bearing, and the faces of thrust plate (7) with engine oil. Install the thrust plate with the oil groove side toward the idler gear.

(8) Crankshaft gear

Note: Align the "V" timing marks prior to installation.

(9) Engine oil pump drive gear

(10) Torque for the gear retaining bolt ... 55 ± 10 N·m (41 ± 7 lb ft)

3412




Illustration 2g01412711

(11) Fuel pump drive gear and timing advance unit




Illustration 3g01412720

Timing marks

Typical example

(12) Camshaft gear

Note: Align the "V" timing marks prior to installation.

(13) Water pump drive gear

(14) Accessory drive gear

(15) Thrust plate

(16) Torque for the Idler shaft's retaining bolts ... 55 ± 10 N·m (41 ± 7 lb ft)

(17) (18) Idler gear assembly

(C) Diameter of new idler shaft ... 63.500 ± 0.013 mm (2.5000 ± 0.0005 inch)
Bore in the idler shaft's bearing after assembly ... 63.602 ± 0.038 mm (2.5040 ± 0.0015 inch) (D) Diameter of new oil pump idler shaft ... 34.943 ± 0.013 mm (1.3757 ± 0.0005 inch)
Bore in the oil pump idler shaft's bearing after assembly ... 35.034 ± 0.038 mm (1.3793 ± 0.0015 inch) (E) Extension of the pin from the front of the oil pump idler shaft ... 3.048 mm (0.1200 inch) (F) Extension of dowel from the bottom of the oil pump's idler shaft ... 4.826 mm (0.1900 inch)

Prior to assembly, lubricate the idler shaft, the bearing's bore, and the faces of thrust plate (15) with engine oil. Install the thrust plate with the oil groove side toward the idler gear.

(19) Crankshaft gear

(20) Oil pump idler gear

(21) Thrust plate for the engine oil pump's idler gear

During assembly, install the thrust plate with the oil groove side toward the idler gear.

(22) Bolt for the oil pump's idler shaft

Prior to assembly, apply 4C-9502 Gasket Sealant to the bolt threads and to the bearing face of the bolt.
Torque for the oil pump's retaining bolt ... 55 ± 10 N·m (41 ± 7 lb ft)

(23) Oil pump drive gear

(24) Torque for the oil pump drive gear's retaining bolt ... 55 ± 10 N·m (41 ± 7 lb ft)

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