1674 DIESEL TRUCK ENGINE Caterpillar


Fuel Transfer Pump (7S4447 and 4N4874)

Usage:

Pressure of fuel to injection pump ... 25 to 32 psi(1.76 to 2.25 kg/cm2)

(1) Bore in bearing ... .4953 ± .0003 in.(12.581 ± 0.008 mm)

(2) Depth of bore in body ... .3750 ± .0003 in.(9.525 ± 0.008 mm)

(3) Torque for nut ... 22 ± 5 lb. ft.(3.0 ± 0.7 mkg)

(4) Clearance between gear and cover ... .001 to .003 in.(0.02 to 0.08 mm)

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

Bore in bearing ... .4953 ± .0003 in.(12.581 ± 0.008 mm)

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

(6) 7S4442 Spring for bypass valve:

Length under test force ... .696 in.(17.67 mm)

Test force ... .025 lbs.(0.01 kg)

Free length after test ... .912 in.(23.17 mm)

Outside diameter ... .344 in.(8.74 mm)

(7) Torque for plug ... 110 ± 15 lb. ft.(14.2 ± 2.1 mkg)

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