M2/M3 BFV ENGINE STARTING/CHARGING SYS - OD1603 - LESSON 1/TASK 1
Upon removal of the power unit (8)(figure 2 on the following page),
turn the engine manually two complete revolutions in the direction of rotation.
Use a breaker bar (9) and a 7/8 inch socket (10) for turning the engine. Because
the engine turns freely, the starter is not locked to the engine. But the starter
does not turn the engine, indicating that the starter is defective and must be
replaced. Replacing the starter is described next.
Replacing the Starter.
Procedures that unit maintenance personnel would
follow for replacing the starter are discussed in the steps listed below.
At this time, the following functions would be performed (as described
in TMs 9-2350-252-10-1 and -2):
(1) Manually traverse the turret to 120 mils.
(2) Manually elevate the 25mm gun to its maximum elevation.
(3) Lower and secure the trim vane.
(4) Open and secure the power unit access door.
(5) Open and secure the engine air inlet grille.
(6) Remove the power unit access door and bolted beam.
(7) Remove the hull access cover.
(8) Remove the power unit from the vehicle hull.
(9) Remove the oil dipstick tube from the engine.
Remove wire leads 1W3E2 (11), shown in figure 2 on the following page,
3W1E16 (12), and 3W4E1 (13) from terminal (14) on the solenoid (15). These removal
functions are performed by removing the nut (16) and lockwasher (17).
Remove wire lead 3W1E14 (18) from the solenoid bus bar (19) by removing
the nut (20). Tag the lead to avoid confusing it with the other leads.