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 TM 5-1940-277-20
TM 1940-20/2
Section IV. TROUBLESHOOTING
2-5. INTRODUCTION. This section tells you how to find and fix most things that go wrong with the boat.
Malfunctions which might occur are listed followed by the check, test, or inspection of the probable cause.
The corrective action recommended for the probable cause is then described. Do all checks, tests,
inspections and corrective actions in the order listed. After you complete a corrective action operate the
equipment to see if the malfunction has been eliminated. If the malfunction continues, go on to the next
step.
This manual cannot list all malfunctions that may occur, or all checks, tests, inspections and corrective
actions possible. If a malfunction is not listed, or is not corrected by the corrective actions listed, notify
your supervisor.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
Tasks one through ten apply to the MK1 and MK2 w/Sabre. Tasks
eleven through twenty-one apply to the MK2 w/Cummins.
1.
ENGINE FAILS TO CRANK WHEN START SWITCH ENGAGED.
Step 1.
Check position of master battery switch (refer to paragraph 1-17).
a. Set master battery switch "ON".
Step 2.
Check port battery condition meter reading.
a. If below 24 vdc go to Step 4.
Step 3.
Check battery connections and cables (refer to paragraph 3-90).
a. Clean and tighten connections (refer to paragraph 3-90).
b. Replace defective cables (refer to paragraph 3-90).
Step 4.
Test batteries (refer to paragraph 3-88).
a. Replace defective battery (refer to paragraph 3-89).
Step 5.
Test master switch (refer to paragraph 3-100).
a. Replace defective master switch (refer to paragraph 3-100).
b. Report defective control box to direct support maintenance
(refer to paragraph 3-110).
Step 6.
Test engine start switch.
a. Replace defective start switch
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