Replace/Repair Thermostat and Housing Group. (FIGURES 2-16 and 2-17)

TM 55-1905-223-24-4

2-23.

This task covers:

a. Removal,

b. Inspection,

Repair,

d. Replacement.

INITIAL SETUP

Tools

Equipment Condition

Tool kit, general mechanic's

Engine shut down and tagged "Out of

rail and marine diesel engines,

Service" (TM 55-1905-223-10).

Coolant drained.

Torque wrench kit P/N 3377216

Battery banks disconnected.

Materials/Parts

Flow control thermostat P/N 3912587

Gasket P/N 3903301

Coolant, Item 4, Appendix C

Warning tags, Item 21, Appendix C

REMOVAL

a. Remove the V belt (para. 2-21) from the alternator pulley.

b. Disconnect the negative (-) battery cable.

Loosen the alternator capscrew. Remove the alternator mounting capscrew and lower the alternator to gain

access to the thermostat. Refer to para. 2-22.

d. Remove two bolts (1) and capscrew (2).

e. Carefully, remove water outlet (3), thermostat (4), gasket (5) and lifting bracket (6).

INSPECTION

a. Verify that the "jiggle" pin (1, FIGURE 2-17) is securely in place.

b. Make sure the vent notch (2) is open and free of corrosion.

Check the thermostat for correct operation. Requirements: It should start to open at 181 (83 ); fully open at

203 (95 ).

d. Put the thermostat and a thermometer into a container of water.

Use a wire to hold the thermostat the

thermometer so that they will not touch the container.

2-59