OVERHEATING

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LOSS OF POWER.

TM-55-1925-204-12 TUG Harbor Diesel 1200 H. P. Steel 100 Ft Design 3006 Flight One FSN 1925-375-3003 Manual

MOTOR RUNS TOO SLOW UNDER LOAD

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

7. OVERHEATING.

Step 1. Check for scale or deposits in fresh water cooling system.

Clean cooling system (para 5-20).

Step 2. Check for scale or deposits in raw water side of heat exchanger.

Clean heat exchanger (para 5-20).

Step 3. Check if sea water (raw water) inlet is clogged at sea chest.

Blow out sea chest with compressed air.

Step 4. Check for insufficient supply of fresh water.

Fill expansion tank: check for water leaks.

Step 5. Check if raw water pump is worn.

Replace pump (para 5-22).

Step 6. Check if fuel injection is too late.

Retime fuel injection (paras 5-13 and 5-16).

Step 7. Check for back pressure in exhaust line.

Clean exhaust system.

Step 8. Check if overloading the engine.

Reduce load.

8. LACK OF LUBRICATING OIL PRESSURE.

Step 1. Check for dirt in lubricating oil relief valve, or broken spring.

Clean valve, replace spring if broken (para 5-10).

Step 2. Check if oil supply is low in crankcase.

Check dip stick, add oil to FULL mark.

Step 3. Check if suction screen plugged.

Remove screen and clean in solvent (para 5-10).

Step 4. Check for worn bearings.

Replace worn bearings (paras. 5-4 or 5-8).

Step 5. Check for worn oil pump.

Repair or replace (para 5-10).

Step 6. Check for use of improper lubrication.

See lubrication order for correct oil (LO 55-1925-204-12-5).

Step 7. Check if oil filter is clogged.

Remove and clean (para 5-11).

9. ENGINE FAILS TO START AT TEMPERATURE ABOVE 32 F.

Step 1. Check for governor stop control in STOP position.

Put control in operating position.

Step 2. Check if fuel shutoff valve is closed.

Open valve.

Step 3. Check for water in fuel.

Drain fuel system; refill and prime.

Step 4. Check for battery not sufficiently charged to turn engine over fast enough.

Replace with fully charged battery.

Step 5. Check for insufficient fuel.

Fill fuel oil day tank.

Step 6. Check for low compression.

Adjust tappet clearance (para 5-7). Inspect compression rings; replace worn or stuck rings (para 5-4).

05 GROUP-DIRECT CURRENT MOTOR AND AUXILIARY SET GENERATORS.

1. MOTOR WILL NOT START.

Step 1. Check for open circuit in control.

Check control for open starting register, open switch, or burned fuse. Close switch. Replace a fuse.

Step 2. Check for low terminal voltage.

Check generator output. Adjust voltage to 115 volts (para. 2-17g.(7)(d)3).

Step 3. Check for frozen bearing.

Replace bearing.

Step 4. Check for an overload.

Reduce load.

Step 5. Check for excessive friction.

Check lubrication in bearings to make sure that oil has been replaced after installation of motor. Disconnect

motor from driven machine and turn motor by hand to see if trouble is in motor. Strip and reassemble

motor; then check part by part for proper location and fit.

2. MOTOR STOPS AFTER RUNNING SHORT TIME.

Step 1. Check if motor is getting power.

Check voltage at the motor terminals also check fuses, clips, and overload relay.

3. MOTOR ATTEMPTS TO START BUT OVERLOAD RELAYS OPERATE.

Step 1. Check if motor is started with weak or no field.

If adjustable speed motor, check condition of rheostat. Check field coil for open windings. Check wiring for

loose or broken connection.

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