Quantcast HIGH COOLANT TEMPERATURE

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TM 55-1905-217-12
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2. Check cooler by-pass valve.
Remove the by-pass valve and clean the valve and valve seat and inspect. Replace the
defective parts (para 4-25).
Step 3. Check gag
Install a serviceable gage (para 4-19).
7. HIGH COOLANT TEMPERATURE
Step 1. Inspect cooling system.
Clean the cooling system and thoroughly flush to remove scale deposits (para 4-41).
Step 2. Check circulation.
Inspect for collapsed or disintegrated hoses Replace all faulty hose Thermostats may be
inoperative. Remove, inspect, and test the thermostat; replace it if found faulty (para 4-44).
Check the water pump for a loose or damaged impeller. Check for an air leak on the suction
side of the water pump Replace defective parts (para 4-68).
TORQUEMATIC MARINE GEAR
1. LOW OIL PRESSURE
Step 1. Check the pressure gage (para 4-68).
Replace if faulty.
Step 2. Check the lubricating oil
Check the oil temperature and if found to be abnormally high, remove and clean, both inter-
nally and externally, the marine gear oil cooler. Replace the cooler if necessary (para 4-25).
Clean the oil strainer with fuel oil and replace (fig. 3-3. Replace the oil filter element (fig.
Step 3. Check for oil leaks in pump suction lines
Inspect the pump suction lines, strainer cap and gaskets for air leaks. Repair or replace
leaking liner and fittings (para 4-88).
1. ALTERNATOR FAILS TO CHARGE
Step 1. Check for worn or defective brushes
Replace brushes (para 4-48).
Step 2. Check regulator.
Replace regulator (para 4-49).
2. LOW OR UNSTEADY CHARGING RATE
Step .1. Check for worn, sticky, or intermittent brush contact,
Replace brushes (para 4-48).
step 2. Check regulator.
Replace regulator (para 4-49).
3. EXCESSIVE CHARGING RATE
Step 1. Check regulator.
Replace regulator (para 4-49).
4. NOISY ALTERNATOR
Step 1. Check for worn bearings
Replace alternator (para 4-48).
ELECTRIC STARTING SYSTEM
1. STARTER WILL NOT CRANK ENGINE
Step 1. Check for loose connection or defective wiring.
Replace damaged wiring and tighten all connections to the starter, magnetic switch, and bat-
Step 2. Check for defective witch.
Inspect all switches to determine their condition. Connect a jumper lead around any switch
suspected of being defective. If system functions, replace the bypassed switch (para 4-47).
Step 3. Check commutator to determine if dirty or worn.
Inspect commutator by removing inspection plugs. If commutator is dirty or lightly grooved,
polish it by placing a strip of No. 00 sandpaper around the commutator and under brushes
(rough side toward commutator) and rotate the armature Blow the dust from the commuta-
tor after polishing (para 4-47).
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