3408 & 3408B DIESEL TRUCK ENGINE Caterpillar


Fuel Transfer Pump

Usage:



(1) Diameter of the shaft ... 12.540 ± 0.003 mm (.4937 ± .0001 in.)

Maximum temperature of the gear for installation on the shaft ... 316°C (600°F)

NOTE: For position of gear on shaft, See (5)

Bore in the bearings (both) ... 12.581 ± 0.013 mm (.4953 ± .0005 in.)

Maximum permissible clearance between bearings and shaft (worn) ... 0.08 mm (.003 in.)

NOTE: The shaft must rotate freely when the cover bolts are tight.

(2) Clearance between the gears and the cover (new) ... 0.020 to 0.051 mm (.0008 to .0020 in.)

(3) Diameter of the shaft ... 12.482 ± 0.008 mm (.4914 ± .0003 in.)

Bore in the gear ... 12.512 ± 0.008 mm (.4926 ± .0003 in.)

Clearance between shaft and gear (new) ... 0.015 to 0.046 mm (.0006 to .0018 in.)

(4) Depth of the bore in the body (new) ... 12.687 ± 0.008 mm (.4995 ± .0003 in.)

(5) Distance from the gear to the shoulder of the shaft ... 49.71 mm (1.957 in.)

(6) Torque for plug of bypass valve ... 37 ± 4 N·m (27 ± 3 lb.ft.)

Pressure of fuel to open the valve ... 230 kPa (33 psi)

(7) 6N1069 Spring for bypass valve:

Length under test force ... 33.96 mm (1.337 in.)

Test force ... 26 ±1 N (5.9 ± .3 lb.)

Free length after test ... 53.52 mm (2.107 in.)

Outside diameter ... 10.31 mm (.406 in.)

(8) Torque for nut ... 30 ± 7 N·m (22 ± 5 lb.ft.)

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