G3508J, G3516J, and G3520J Engines Caterpillar

Assembly Procedure

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Illustration 1	g01253344

1. Align bearings (12) in the body of engine oil pump (9). The bearing joints should be 45 ± 15 degrees from the centerline of the bearing bores.

2. Use Tooling (A) and a suitable press to install bearings (12). The bearings must be 1.5 ± 0.5 mm (0.06 ± 0.02 inch) below the gear bore. The diameter of the bearings must be 31.811 ± 0.013 mm (1.2524 ± 0.0005 inch) after installation.
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   Illustration 2	g00591964

3. Replace gears (11) and the shaft assemblies, if necessary.
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   Illustration 3	g00591963

4. Install shaft assemblies (10) in engine oil pump (9).
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   Illustration 4	g01253345

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   Illustration 5	g00591962

5. Ensure that dowels (13) and (14) are installed in cover assembly (7) at a distance of 6.0 ± 0.5 mm (0.24 ± 0.02 inch) above the surface of the cover.

6. Use Tooling (A) and a suitable press to install bearings (8) in cover assembly (7) with the bearing joints in the correct position. The bearing joints should be 45 ± 15 degrees from the centerline of the bearing bores.

7. Install cover assembly (7) on the engine oil pump.
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   Illustration 6	g01253349

8. Ensure that the pins in cover assembly (6) are installed at a distance of 6.0 ± 1.0 mm (0.24 ± 0.04 inch) above the surface of the cover.

9. Install the gasket and cover assembly (6) on the engine oil pump.
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   Illustration 7	g00591930

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   Illustration 8	g00591928

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   Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.

10. Place clean engine oil on valve spool (5). Install spring (4), gasket (3), cover (2), and bolts (1).

End By:

1. Install the engine oil pump.