G379, G398 & G399 ENGINES Caterpillar


Oil Pump Relief Valves

Usage:

(1) Torque for plug ... 377 ± 14 N·m (280 ± 10 lb ft)

NOTE: Do not use sealant on plug.

(2) 3N4875 Spring for relief valve:

Length under test force ... 73.9 mm (2.91 in.)

Test force ... 845 ± 40 N (190 ± 9 lb.)

Free length after test ... 101.1 mm (3.98 in.)

Outside diameter ... 31.0 mm (1.18 in.)

(3) Diameter of valve ... 41.199 ± 0.013 mm (1.6220 ± .0005 in.)

Bore in housing for valve ... 41.275 ± 0.013 mm (1.6250 ± .0005 in.)

(1) 4W1810 Spring for relief valve:

Length under test force ... 124.2 mm (4.9 in.)

Test force ... 674 ± 47 N (152 ± 11 lb.)

Free length after test ... 151.7 mm (6.0 in.)

Outside diameter ... 27.0 mm (1.06 in.)

(2) Diameter of valve ... 35.624 ± 0.013 mm (1.4025 ± .0005 in.)

Bore in housing for valve ... 35.712 ± 0.013 mm (1.4060 ± .0005 in.)

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