HIGH COOLANT TEMPERATURE

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Table 4-3. Troubleshooting - Organizational

TM-55-1905-217-12 Landing Craft Mechanized; Steel; DED; Overait Length 74 Feet Mod 1 Marl VIII Navy Design LCM-8 Hull Numbers 8500 and 8580 thru 8618 Manual

HYDRAULIC STARTING SYSTEM

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.

3-1 or fig. 4-2).

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).

ALTERNATOR

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-

teries (para 4-47).

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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