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 TM 55-1905-242-14
UNIT MAINTENANCE
FOR LANDING CRAFT, MECHANIZED (LCM-8) (ALL VESSELS WITH MOD 2 APPLICATION)
UNIT TROUBLESHOOTING PROCEDURES
INITIAL SETUP:
Tools and Special Tools:
Materials/Parts:
Tool Kit, Mechanic's Rail and Marine
As required, consult TM 55-1905-242-24P
(Item 1, Table 1, WP 0230 00)
References:
Multimeter (Item 2, Table 1, WP 0230 00)
FO-1
Personnel Required:
FO-2
One Watercraft Engineer, 88L
TM 5-2815-231-14
TM 55-1905-242-24P
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
24 VDC ELECTRICAL SYSTEM
1. ENGINE START button
1.
Use multimeter to check for proper operation
If the switch is defective,
does not crank engine.
of the switch.
replace it.
2.
Use multimeter to check for 24 Vdc at the
1.
If 24 Vdc is present at the con-
control valve.
trol valve, replace the
control valve (WP 0088 00).
2.
If 24 Vdc is not present at the
control valve, use the wiring
diagram in FO-2 to locate
the OPEN circuit. Repair
the OPEN circuit.
ALARM SYSTEMS
1. Engine alarm alerts when
1.
With the engine running, remove one lead
1.
If the alarm ceases, replace
no problem exists.
from the oil pressure switch and observe the
the oil pressure switch.
alarm lights.
Refer to TM 5-2815-231-14.
2.
If the alarm light remains lit,
reinstall the lead and
proceed to test 2 below.
2.
With the engine running, remove one lead
1.
If the alarm ceases, replace
from the temperature switch and observe the
the temperature switch.
alarm lights.
Refer to TM 5-2815-231-14.
2.
If the alarm light remains lit,
use the wiring diagram in
FO-2 to locate the short
circuit. Repair the short
circuit.
2. Engine alarm inoperative.
1.
Use the multimeter to check for 24 Vdc on
1.
If 24 Vdc is present on only
both sides of the fuel switch.
one side of the fuel switch,
replace the switch.
0050 00-1
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