APU SECONDARY FUEL FILTER

TM 5-4210-233-14&P-1

4-211. APU SECONDARY FUEL FILTER

This task covers:

a. Removal

c. Follow-on Maintenance

b. Installation

TOOLS REQUIRED

EQUIPMENT CONDITION

Tool Kit, General Mechanics, Automotive

Main Engine Shutdown (see para 2-12.)

(Appendix B, Section III, Item 1)

APU Shutdown (see para 2-16.)

Batteries Disconnected (see para 4-114.)

MATERIALS/PARTS REQUIRED

Diesel Fuel (Item 41, Appendix E)

Secondary Fuel Filter (Figure 212, Appendix E)

a. Removal.

CAUTION

Due to the precise tolerances of diesel injec-

tion systems, it is extremely important the fuel

be kept clean. Dirt or water in the system can

cause severe damage to both the injection

pump and the injection nozzle.

CAUTION

When removing or installing drain plug on fuel

filter, use two wrenches in combination for

breaking plug loose and for final tightening.

(1) Remove drain plug (1) and drain secondary fuel filter (2).

(2) Remove bolt (3) and washer (4).

(3) Remove secondary fuel filter (2).

b. Installation.

(1) Clean filter mounting area and moisten filter

gasket with diesel fuel (Item 41, Appendix E).

(2) Install new secondary fuel filter until gasket touches

mounting base then tighten 1/4 to 1/2 turn.

(3) Install bolt (3) and washer (4).

(4) Install drain plug (1).

c. Follow-on Maintenance.

(1) Connect batteries (see para 4-114).

(2) Prime fuel system and start and operate APU (see para

2-1 6) and check for leaking. Tighten filter

in small increments till leaking ceases.

4-525