3412C Engine Caterpillar

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Illustration 1	g00798430

1. Use Tool (C) in order to Install camshaft bearings (78), if necessary.

2. Install fourteen bolts (79), the cover and the gasket from each side of fuel injection pump (10). Tighten the bolts to a torque of 14 ± 4 N·m (10 ± 3 lb ft).

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Illustration 2	g00798421

Note: Do not damage the camshaft bearings when the camshaft is installed.

3. Install camshaft (77) in fuel injection pump housing (10) .

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Illustration 3	g00798418

4. Install the lock (76) for the camshaft.

5. Install two bolts (75) and the locking tabs.

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Illustration 4	g00798416

6. Put clean engine oil on the valve lifters. Install valve lifters (74) and the spacers in the original location.

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Illustration 5	g00798414

7. Put clean engine oil on O-ring (70). Install O-ring (70) on bypass valve assembly (69) .

8. Install spring (71) and bypass valve (72) in valve body (73) .

9. Install bypass valve assembly (69) in valve body (73) .

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Illustration 6	g00798407

10. Put clean engine oil on the O-ring. Install bypass valve (67) and the O-ring seal. Press in adapter (68), if necessary.

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Illustration 7	g00798404

11. Install the plate assembly and the gasket on fuel injection pump housing (10). Install six bolts (65) and two bolts (66).

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Illustration 8	g00798400

12. Put clean engine oil on rack regulators (64). Install rack regulators (64) in the original position.

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Illustration 9	g00798393

13. Install Tool (D) in the pump housing with the square end of the tool downward. Hold the racks against Tool (D) and install each of the fuel injection pumps (63) in the original location.

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Illustration 10	g00798389

14. Use Tool (A) in order to install bushing (62) and the seal. The fuel injection pump must be in the proper position. Bushing (62) should go into the pump housing until the bushing is even with the pump housing. Tighten the bushing to a torque of 245 ± 15 N·m (181 ± 11 lb ft). Install the washers.

15. Check the movement of rack with Tool (E) after each pump is installed.

16. Repeat step 13 through step 15 for the remainder of the pumps and bushings.

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Illustration 11	g00798387

17. Install the rack link (60), the bolt, and plug (61) .

18. Install both Tools (D) and hold the racks against the pins.

19. Rotate plug (61) in order to equalize the rack setting. Tighten the bolt.

20. Install the pin, support assembly (58), and two bolts (59) .

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Illustration 12	g00798378

21. Install pump drive gear (57) and two bolts (56) .

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Illustration 13	g00798371

22. Install the O-ring seal on sleeve (55). Install valve (53) on servo piston assembly. Install sleeve (55) and piston (54) on servo piston assembly.

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Illustration 14	g00798369

23. Install retaining ring (48) and spring seat (49). Install rack control sleeve (51) and ring (52) on servo piston assembly (47) .

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Illustration 15	g00798368

24. Install two bolts (46) and servo piston (47) .

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Illustration 16	g00798364

25. Install tube (43). Install bar (45) for the rack control. Install the bolt and washer (44) .

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Illustration 17	g00798362

26. Install bolts (40) and drive housing (41) .

27. Install sensor (42) .

28. Adjust the gap between sensor (42) and gear (54) to 0.76 ± 0.15 mm (0.030 ± 0.006 inch). Tighten the nut on the sensor to a torque of 14 ± 1 N·m (10 ± 1 lb ft).

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Illustration 18	g00798360

29. Install shaft (39) in star gears (36) and (37) .

30. Install key (38), if necessary.

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Illustration 19	g00798354

31. Install three O-rings (34) and shaft assembly (35) .

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Illustration 20	g00798353

32. Install spring (30) and valve (31) .

33. Install bolt (32) and body assembly (33) .

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Illustration 21	g00798327

34. Install two bolts (28), cover (29), and the gasket.

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Illustration 22	g00798325

35. Install four bolts (26), rotary servo (27), and the gasket from fuel injection pump housing (10) .

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Illustration 23	g00798320

36. Install spring (25), if necessary.

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Illustration 24	g00798298

37. Lubricate the lip seal with clean engine oil. Install retaining ring (23) and the lip seal, if necessary.

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Illustration 25	g00798279

38. Install retaining ring (21) and shaft (22) .

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Illustration 26	g00798270

39. Install spring (20) on control group (19) .

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Illustration 27	g00798265

40. Install the seal, if necessary. Install control group (19) on housing assembly (9) .

41. Tighten jam nut (18) to a torque of 55 ± 7 N·m (41 ± 5 lb ft).

    Note: Adjust the output of the sensor with the rack at zero position. The static timing during the compression stroke is 19.5 degrees before top center with the timing pin in position in the pump housing. The number one cylinder is at top dead center.

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Illustration 28	g00798261

42. Install spring (17) on lever (16), if necessary.

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Illustration 29	g00798260

43. Install lever (16) in housing (9) .

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Illustration 30	g00798256

44. Install receptacle (3) on clip (14) .

45. Install two bolts, two washers (15), and clip (14) .

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Illustration 31	g00798253

46. Use Tool (G) in order to install the seal and shutoff solenoid (13). Lubricate the seal lightly with glycerin. Tighten the solenoid to a torque of 70 ± 10 N·m (52 ± 7 lb ft).

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Illustration 32	g00798251

47. Install solenoid (11) and the seal in housing assembly (9). Lubricate the seal lightly with glycerin.

    Note: Make sure that the lever on the solenoid engages correctly on the rack servo. The engine may run too fast or the engine may not start if the lever is not engaged in the sleeve.

48. Install two bolts, one clip and two clamps (12) .

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Illustration 33	g00797611

49. Install five bolts and washers (8). Install housing (9) and a new gasket on fuel injection pump housing (10) .

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Illustration 34	g00797576

50. Install three bolts and washers (6). Install bracket (5), electronic control (7), and the gasket.

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Illustration 35	g00797609

51. Connect receptacle (3).

52. Connect wires (4) .

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Illustration 36	g00797567

53. Install cover (2) and a new gasket.

    Install five bolts and washers (1) .

End By:

1. Install the fuel injection pump housing and the governor. Refer to Disassembly and Assembly, "Fuel Injection Pump Housing and Governor - Install"
2. Install the fuel transfer pump. Refer to Disassembly and Assembly, "Fuel Transfer Pump - Install"