3304B & 3306B GENERATOR SET ENGINES Caterpillar


Timing Gears

Usage:

3304B Engines

(1) With the timing pin and timing bolt correctly installed, put a clockwise force of 70 N·m (50 lb ft) on the drive gear for the fuel pump and tighten bolt (1) to ... 270 ± 25 N·m (200 ± 20 lb ft)

(2) End play for the idler gear (new) ... 0.10 to 0.42 mm (.004 to .017 in.)

Maximum permissible end play (worn) ... 0.86 mm (.034 in.)

Bore in bearing for the idler gear (new) ... 35.004 ± 0.048 mm (1.3781 ± .0019 in.)

Diameter of shaft for idler gear (new) ... 34.902 ± 0.020 mm (1.3741 ± .0008 in.)

Clearance between shaft and bearing (new) ... 0.034 to 0.170 mm (.0013 to .0067 in.)

Maximum permissible clearance between shaft and bearing (worn) ... 0.23 mm (.009 in.)

(3) Camshaft gear.

Tighten bolts to ... 55 ± 7 N·m (40 ± 5 lb ft)

(4) Crankshaft gear.

(5) End play for the balancer shafts (new) ... 0.089 to 0.191 mm (.0035 to .0075 in.)

Maximum permissible end play (worn) ... 0.43 mm (.017 in.)

Diameter of balancer shaft bearing surface (journal) (new) ... 52.908 ± 0.020 mm (2.0830 ± .0008 in.)

Bore in bearing for balancer shaft (new) ... 53.050 ± 0.061 mm (2.0886 ± .0024 in.)

Maximum permissible clearance between balancer shaft and bearing (worn) ... 0.25 mm (.010 in.)

(6) Idler gear for oil pump.

(7) Drive gear for oil pump.

3306B Engines

(1) With the timing pin and timing bolt correctly installed, put a clockwise force of 70 N·m (50 lb ft) on the drive gear for the fuel pump and tighten bolt (1) to ... 270 ± 25 N·m (200 ± 20 lb ft)

(2) Camshaft gear.

Tighten bolts to ... 55 ± 7 N·m (40 ± 5 lb ft)

(3) End play for the idler gear (new) ... 0.10 to 0.42 mm (.004 to .017 in.)

Maximum permissible end play (worn) ... 0.86 mm (.034 in.)

Bore in bearing for the idler gear (new) ... 35.004 ± 0.048 mm (1.3781 ± .0019 in.)

Diameter of shaft for idler gear (new) ... 34.902 ± 0.020 mm (1.3741 ± .0008 in.)

Clearance between shaft and bearing (new) ... 0.034 to 0.170 mm (.0013 to .0067 in.)

Maximum permissible clearance between shaft and bearing (worn) ... 0.23 mm (.009 in.)

Bearing installation depth ... 1.52 ± 0.25 mm (.060 ± .010 in.)

(4) Crankshaft gear.

(5) Idler gear for oil pump.

Bore in bearing for the idler gear (new) ... 28.600 ± 0.048 mm (1.126 ± .002 in.)

Install bearing flush with face opposite timing mark side of gear.

(6) Drive gear for oil pump.

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