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TM 5-4110-217-14
CHAPTER 5
REPAIR OF ENGINE (Model RMP-J/1-1OG)
Section I. ENGINE ACCESSORIES
flat head screws (19) and terminal stud and washers (20)
5-1. General.
holding coil assembly (21) to. frame (22).
This section contains instructions for maintenance
c. Brush and Spring Repairs (fig. 5-2).
of those items which are considered accessories to the
(1) When brushes are worn more than 0.3 inch,
engine.
replace them.  Check to see that the brushes move
smoothly in the brush holder.
5-2. Starter.
(2) Measure brush spring tension with a tension
The starter is a 12 volt, 2 brush, direct-cranking
meter (fig. 5-3). Push the brush into its holder and take
type starter. The starter converts the electrical energy of
the reading just as the brush slightly projects from the
the battery into the mechanical energy necessary to
brush holder. On a new brush, the spring tension should
rotate the engine crankshaft until the engine can operate
be 29 to 39 ounces
on its own.
d. Armature Testing.
(1) Testing for grounds. Test the armature for
NOTE
grounds by touching the armature shaft or core and the
The starter Bendix assembly has a detent
end of each commutator bar with a pair of ohmmeter
on the Helix which keeps the pinion gear in
leads (fig.  5-4).  If the ohmmeter reading is low, It
mesh with the flywheel ring gear until the
indicates a grounded armature. Replace armature.
engine starts and runs. Centrifugal force
(2) Testing for open circuit.
The most
retracts the pinion on the Helix Once
commonplace for an open circuit to occur is at the
engaged the pinion remains in mesh with
commutator riser bars.  Inspect the points where the
the flysheel ring gear until the engine is
conductors are joined to the commutator bars for loose
running.
connections.
a. Removal. Refer to paragraph 3-41 and remove
(3) Testing commutator runout.  Place the
the starter.
commutator in a test bench and check out runout with a
b. Disassembly (fig. 5-1).
dial indicator (fig.  5-5).  When commutator runout
(1) Remove band cover (1) by loosening its
exceeds 0.004 inch, reface the commutator.
clamping screw.
(4) Testing armature shaft runout.
The
(2) Remove four screws (2) and washers (3) to
armature shaft as well as the commutator may be
partially detach head assembly (4). Release brushes (7)
checked. A bent armature can often be straightened, but
from brush springs (5) to fully detach head assembly (4)
if the shaft is worn, a new armature is required.
(3) Brush springs (5), strap (6) and brushes (7) can be
(5) Testing field coils for grounds. Place one
removed if replacement is required.
test lamp prod on the connector and the other on a clean
(4) Remove armature thrust washer (8) from
spot on the frame after unsoldering shunt field coil wire.
shaft.
If the lamp lights, the fields are grounded either at the
(5) Remove two screws (9) and lockwashers
connector or In the windings (fig. 5-6).
(10) to release pinion housing (11). Remove drive end
(6) Testing field coils for open circuit.  Place
bearing (12), if required.
one prod on the connector and the other on a clean spot
(6) Loosen setscrew (13) to slide off drive
on the brushholder (fig. 5-7). If the test lamp lights, the
assembly (14) from armature shaft. Remove key (17).
field coil is okay. Check all brushholders in the same
manner.
CAUTION
e.  Drive Assembly.  Check for damage of the
Care must be taken not to thread-out the
pinion gear. Verify that the drive shaft is free of rust,
worm gear on the drive assembly.  It is
burrs or bends so the screw shaft can move freely along
difficult to rethread. Keep it in a fully closed
it.
A damaged pinion or screw shaft requires
position unless further maintenance is
replacement of the drive assembly.
required on the drive assembly.
f. Cleaning and Lubrication.
(7) Slide off Intermediate bearing assembly
(1) Clean all parts carefully with a dry cloth and
(15) and washer (16) from armature shaft. Remove four
compressed air if available.
Change 3 5-1

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