REPLACEMENT - TM-55-1905-223-24-40103

TM 55-1905-223-24-4

REPLACEMENT

a. Position pump (4) and secure to engine with capscrews (1), washers (2), and gaskets (3).

b. Locate Top Dead Center (TDC) for cylinder number 1 by barring the engine while pushing in on the ti ing pin

until it engages.

CAUTION

The timing pin is to be used only for locating TDC for

Cylinder No. 1. Do NOT use for locking engine.

The pump drive gear has a tapered bore.

Orient the wide end of the taper toward the engine (timing marks

away). Align the timing marks and set the gear into the housing.

d. Install the pump. Make sure the key does not fall into the gear housing.

CAUTION

Disengage the timing pin before tightening the mounting nuts.

e. Attach the pump by finger tightening the three capscrews. The pump must be free to move.

Install the pump drive and washer shaft nut. (FIGURE 2-29).

NOTE

The pump can rotate slightly due to gear helix and

clearance. This is acceptable providing the pump is free

to move on the flange slots and the crankshaft does not

move.

g. Rotate the pump to align the scribe marks and tighten the three mounting nuts torque 18 ft lbs. If installing new

or rebuilt pump without scribe marks, take up the gear lash by rotating the pump against the direction of drive

rotation. Make sure the engine is at TDC.

h. Torque shaft nut to 11-15 ft-lb and unlock fuel pump.

Replace fuel plumbing (para. 2-30).

Replace protective cover to gears. Refer to Equipment Conditions.

2-86