C175 Oil Pressure Regulator Inspection and Rework{1304, 5117} Caterpillar

Electric Power Generation:

C175-16 (S/N: WYB1-UP)

Engine:

C175-16 (S/N: Y3A1-UP)

Introduction

This Special Instruction provides the procedure in order to check the shims in the oil pressure regulator for the C175 Diesel Engines. Refer to following Tables for the parts needed.

Parts Needed

Shim Inspection and Rework

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Illustration 1	g03526177
(1) Wiring harness (2) Intake manifold

1. Remove and set aside the following components and associated hardware for reuse:
   • Wiring harness (1)

   • Intake manifold (2)

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Illustration 2	g03533385
(3) Cover (4) Alternator

2. Remove cover (3) from alternator (4) .

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Illustration 3	g03533387
(4) Alternator (5) Belt (6) Tensioner

3. Remove belt (5) and tensioner (6) from alternator (4) .

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Illustration 4	g03533397
(7) Bottom cover

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Illustration 5	g03526057
Typical oil pressure control valve group (7) Bottom cover (8) 288-4597 Spring (9) 177-7130 Shim

4. Remove bottom cover (7) from the oil pressure control valve group. Set aside bottom cover and associated hardware for reuse.

5. Remove spring (8) and identify how many shims (9) are in the oil pressure control valve group.

   Refer to Specifications, RENR9337, "Pressure Control Valve - Oil Regulator Valve and Oil Bypass Valve" and Disassembly and Assembly, RENR7466 for more information.

   If there are more than four shims in the oil pressure control valve, proceed to Step 6.

   If there are less than four shims in the oil pressure control valve, proceed to Step 11.

6. Remove four shims (9) from the oil pressure control valve group.

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Illustration 6	g03526079
(8) 288-4597 Spring (10) 6V-8002 O-Ring Seal

7. Install the original spring (8) into the oil pressure control valve group.

8. Attach the original bottom cover and one O-ring (10) to oil pressure control valve group with the original hardware.

   If possible, after the shims are removed and the oil pressure control valve group is put back together, start the engine and run under load until an engine oil temperature of 95° C (203° F ) to 100° C (212° F ) is reached.

   Verify that the oil pressure is between 550 kPa (80 psi ) and 600 kPa (87 psi).

   Each removed shim should result in approximately 15 kPa (2 psi ) drop in oil pressure.

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Illustration 7	g03526244
(2) Intake manifold (11) 258-9926 Gasket (12) 095-1687 O-Ring Seal

9. Attach intake manifold (2) to the engine with two gaskets (11), two O-rings (12), and the original hardware.

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Illustration 8	g03526256
(1) Wiring harness

10. Attach wiring harness (1) to the engine with the original hardware.

    Note: If there were four or more shims, the inspection and rework are complete.

11. Drain the engine coolant into a suitable container for disposal or reuse.

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Illustration 9	g03541609
(13) Oil tube assembly (14) Coolant pipe

12. Remove coolant pipe (14) from the engine.

13. Remove oil tube assembly (13) from the engine. Catch the engine oil in a suitable container for disposal or reuse.

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Illustration 10	g03526298
(15) 354-4924 Pressure Control Valve Gp (16) 6V-9851 Elbow (17) 353-5985 Elbow (18) 327-0812 Hose As

14. Remove the two hose assemblies (18) .

15. Remove pressure control valve group (15) and elbow (17) from the oil pump.

16. Remove elbow (17) from pressure control valve group (15) .

17. Remove elbow (16) from elbow (17) .

18. Install the 241-6158 Plug and one 228-7102 O-Ring Seal into elbow (9) .

19. Using a suitable lifting device, remove pressure control valve group (15). The pressure control valve group weighs approximately 30 kg (66 lb).

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Illustration 11	g03526299
(19) 380-4432 Pressure Control Valve Gp (20) Square manifold with the 327-0817 Check Valve Gp (21) Cap assembly

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Illustration 12	g03527868
(17) 353-5985 Elbow (19) 380-4432 Pressure Control Valve Gp (22) 112-8186 O-Ring Seal (23) Oil tube assembly (24) 269-7885 O-Ring Seal (25) Side cover (26) 272-0759 Seal

20. Install two O-rings (24) onto oil tube assembly (23) .

    Note: Lubricate the O-rings with engine oil.

21. Install the oil tube assembly (23) into pressure control valve group (19) .

22. Using a suitable lifting device, install pressure control valve group (19) and oil tube assembly (23) into side cover (25). The pressure control valve group and oil tube assembly weigh approximately 30 kg (66 lb).

23. Attach elbow (17) to pressure control valve group (19) with one O-ring (22) and the original hardware.

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Illustration 13	g03526302
The 353-5985 Elbow is hidden to show O-rings. (27) Connector (28) 228-7089 O-Ring Seal (29) 228-7106 O-Ring Seal (30) 418-1262 Hose As (31) 3E-6751 O-Ring Seal

24. Attach the 353-5985 Elbow to the oil pump with one O-ring (31) and the original hardware.

25. Remove the original connector (27) from the engine.

26. Remove the two original O-rings from connector (27) .

27. Install the original connector (27) and one O-ring (28) into the engine.

28. Attach hose assembly (30) and one O-ring (29) to connector (27) .

29. Remove the cap assembly from the 327-0817 Check Valve Gp .

30. Attach hose assembly (30) to the 327-0817 Check Valve Gp .

    Note: Make sure that the O-ring is in the 327-0817 Check Valve Gp .

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Illustration 14	g03529756
(32) 109-7411 O-Ring Seal (33) 6V-3835 O-Ring Seal

Note: Use O-rings (32) and (33) if the oil pump is removed from the engine.

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Illustration 15	g03527864
(34) 6V-1196 O-Ring Seal (35) 346-7703 O-Ring Seal

31. Install one O-ring (35) onto each end of the oil tube assemblies.

32. Install one O-ring (34) into each flange.

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Illustration 16	g03527862
(2) Intake manifold (3) Coolant pipe (11) 258-9926 Gasket (14) 095-1687 O-Ring Seal

33. Attach intake manifold (2) to the engine with two gaskets (11), two O-rings (12), and the original hardware.

34. Install water pipe (3) with the original hardware.

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Illustration 17	g03526256
(1) Wiring harness

35. Attach wiring harness (1) to the engine with the original hardware.