Chapter 3. ENGINE REPAIR INSTRUCTIONS

TM 5-6115-400-35

CHAPTER 3

ENGINE REPAIR INSTRUCTIONS

Section I. ENGINE ACCESSORIES

can be obtained by varying the

30. General

resistance unit.

This section contains those items which are considered

accessories to the engine. They consist of the starter,

(b) Rated current draw and no-load

battery charging generator, generator regulator, fuel

speed indicates normal condition of

injection pump, mechanical governor, water pump, fan

the cranking motor.

hub, turbocharger, and the Winterization heaters.

31. Electric Starting Motor

a. General.

This is a heavy-duty, 24-volt,

submersion proof, fungus and corrosion resistant,

solenoid-operated, enclosed shift-lever type engine

starter with eight brushes retained in four brush holders.

The drive clutch is a heavy-duty overrunning type and

the pinion clearance is adjustable.

b. Removal. Refer to TM 5-6115-400-12.

c. Bench Testing.

Note. Never operate the cranking

motor more than 30 seconds at a

time without pausing to allow it to

cool at least two minutes.

(1) The armature should be checked for

freedom of operation by turning the drive.

Tight, dirty, or worn bearings, bent

armature' shaft, or loose pole shoe screw

will cause the armature to drag and it will

not turn freely.

(2) No-Load Test (fig. 6).

(a)

Connect the cranking motor in

series with a fully charged battery to

provide 24 volts, an ammeter

capable of reading several hundred

amperes, and a variable resistance.

Also connect a voltmeter as

illustrated, from the motor terminal

Figure 6. No load test

to the motor frame.

An r.p.m.

indicator is necessary to measure

armature speed. Proper voltage