COVER 1951004 - Caterpillar

Illustration 1 g03150497
Table 1
Specification for 379-3989 Engine Oil Pump Gp
Item Qty Part Specification Description
Before you install the pump, lubricate the moving parts with clean engine oil. Rotate the pump by hand in order to ensure that the pump rotates freely.
1 1 236-6733 Spring Length under test force is 82.87 mm (3.263 inch).
Test force is 709 35 N (159 8 lb).
Free length after test is 130.0 mm (5.12 inch).
2 1 105-1482 Pump Drive Shaft As Diameter of the new shaft is 22.217 0.005 mm (0.8747 0.0002 inch).
Distance from the end of the shaft to the gear face is 53.00 0.25 mm (2.087 0.010 inch).
3 1 107-7373 Idler Shaft Assembly Diameter of the new shaft is 22.217 0.005 mm (0.8747 0.0002 inch).
Distance from the end of the shaft to the gear face is 36.50 0.25 mm (1.437 0.010 inch).
- 2 107-73772 Gear Length of the new gear is 140.000 0.025 mm (5.5118 0.0010 inch).
Depth of the bore in the oil pump body for the new gear is 140.127 0.020 mm (5.5168 0.0008 inch).
Illustration 2 g03150498
116-1979 Oil Pump Body As
Table 2
Item Qty Part Specification Description
4 2 7N-2156 Bushing Installation depth (D) is 0.30 0.25 mm (0.012 0.010 inch).
Position (B) of bushing joints from the centerline through the bearing bores is 30 15 degrees.
5 2 8M-8489 Dowel Protrusion (E) is 6.4 0.5 mm (0.25 0.02 inch).
Illustration 3 g03150499
127-6356 Pump Cover
Table 3
Item Qty Part Specification Description
6 2 8S-6511 Bushing Install the bushing flush with face (7).
Position (F) of bushing joints from the centerline through the bearing bores is 30 15 degrees.