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ENGINE RUNS BUT CONTINUALLY MISFIRES.
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TM-5-4320-234-12 Pump Centrifugal Self-Priming Gasoline Engine Driven Wheel Mounted 6-Inch 1500 GPM Capacity At 60 Foot Head Manual
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ENGINE RUNS BUT LACKS POWER - TM-5-4320-234-120040
TM 5-4320-234-12
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ENGINE--Continued
b. Wipe the exterior of the spark plugs with a cloth dampened with dry cleaning solvent (fed. spec PD-680),
dry thoroughly.
c. Check the ceramic insulator for cracks, porosity, and other damage.
d. If the electrodes of the spark plugs are not too badly burned, remove the scale and other deposits from
them. This can be done by a sand-blast-type cleaner or with a contact file.
e. Inspect the electrodes for severe burning, cracks, and other damage. Replace any spark plug whose
condition is doubtful.
f. Make sure all spark plugs are gapped to 0.025 inch before installation. Install and torque the spark plugs to
35 foot pounds.
5. ENGINE OVERHEATS
Step 1. Check oil level.
If oil level is low, fill to the proper level with recommended oil.
Step 2. Check that radiator stone shield is open and that radiator is clear of foreign matter.
Always open stone shield before operating engine. Remove foreign matter from radiator.
Step 3. Check for low coolant level.
Refill with approved coolant as required.
Step 4. Check for loose or damaged fan belt.
a. Inspect the fan belt for cracks, brittleness, and severe glazing. Replace a damaged fan belt.
b. Loosen the adjusting screw on the alternator adjusting strap and push the alternator toward the engine to
loosen fan belt tension. Slip the fan belt off the alternator drive pulley and remove it from the fan and drive
pulley.
c. Position a new fan belt on the fan and drive pulley and alternator drive pulley.
d. Pull the alternator away from the engine with hand pressure to tighten the fan belt.
e. Hold the alternator away from the engine and tighten the adjusting screw. The fan belt should be tensioned
so that it can be deflected approximately 3/4 inch with thumb pressure at a point midway between pulleys at
the longest belt span.
Step 5. Check for a clogged radiator.
a. Cover the engine with a piece of plastic film to prevent saturating the components before attempting to flush
the exterior of the radiator.
b. Clean the exterior of the radiator by flushing a steam of water through it in a direction opposite that of the
cooling fan. Since this engine uses a pusher type fan, it is necessary to squirt the water from the outside of the
radiator inward toward the engine.
c. Disconnect the hoses connecting the engine and radiator. With the radiator cap closed tightly, use a
flushing gun to reverse-flush the radiator. Fill the radiator with water, then blow out the water with compressed
air, applying pressure slowly to prevent radiator damage. Repeat several times until the expelled flushing
stream is clear.
Step 6. Check for a defective water pump.
a. Loosen the adjusting screw on the alternator adjusting the strap and push the alternator toward the engine
to loosen fan belt tension.
b. Check the rotation of the water pump shaft by turning the fan by hand. It must turn easily without catching
or binding. Replace a leaking or damaged water pump.
c. Remove the fan belt from the fan and drive pulley. Remove the four capscrews that secure the fan to the
water pump pulley; remove the fan.
d. Drain the coolant from the radiator and cylinder block. Disconnect coolant hoses and bypass tube from the
water pump. Remove the elbow and adapter. Remove three capscrews and lockwashers that secure the water
pump to the cylinder block; remove the water pump and gasket.
e. Position water pump and gasket on the cylinder block and secure with screws and lockwashers.
Install the elbow and adapter. Connect coolant hoses and bypass tube to the water pump. Add coolant to the
radiator and cylinder block.
f. Install the fan on the water pump pulley and secure with capscrews. Install fan belt on the fan and drive
pulley and alternator drive pulley.
g. Pull the alternator away from the engine with hand pressure to tighten the fan belt.
h. Hold the alternator away from the engine and tighten the adjusting screw. The fan belt should be tensioned
so that it can be deflected approximately 3/ inch with thumb pressure at a point midway between pulleys at the
longest belt span.
Step 7. Check for a defective thermostat.
a. Drain coolant from the radiator. Remove radiator top hose and water pump bypass tube.
b. Remove two nuts and lockwashers and remove water outlet elbow, gasket, and thermostat.
c. Inspect the thermostat for obvious defects, including ruptured bellows and distortion. If the valve, when
cold, can be pushed off its seat with only slight effort, the thermostat is defective and must be replaced.
d. Check the thermostat operation as follows:
(1)
Hang the thermostat by its frame in a container of water so that it does not touch the container.
Hang a thermometer in the container to maintain a check of water temperature.
(2)
Heat the water slowly while watching the thermometer and thermostat. The thermostat must start
to open before the thermometer indicates 180 F. (82.22 C.). Replace the thermostat if it fails to open at
180 F (82.22 C) or if it starts to open before 160 F. (71.11 C).
4-9

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