Table 3-2. Troubleshooting -- Continued

TM 5-4320-273-14

Table 3.2. Trouble shooting -- Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

ENGINE -- Continued

Check for pulled out choke.

Step 3.

Push in choke control.

Check for tripped oil pressure safety switch.

Step 4.

If switch has been tripped, check oil level in crankcase.

If low, fill to proper level with recommended oil. If oil level is not the cause, notify organizational main-

tenance.

Check for clogged fuel line.

Step 5.

Loosen slightly the fuel line nut at carburetor.

If line is open, fuel should drip out at loosened nut.

Report clogged fuel line to organizational maintenance.

4. ENGINE RUNS BUT CONTINUALLY MISFIRES.

Step 1.

Check for water in fuel.

Drain fuel tank and lines. Refill with clean fuel.

Check for clogged fuel strainer.

Step 2.

Service the fuel strainer.

Turn the fuel selector valve to the OFF position,

Loosen the nut (1, fig. 3-3) on the bail assembly (2) and owing the bail aside.

Remove the fuel bowl (3), gasket (4), and empty the fuel bowl contents. Wipe the fuel bowl out with a clean

cloth.

Remove the strainer element (5) and inspect it for contamination. Replace a contaminated strainer element.

Install strainer element (5) in fuel strainer head (6).

Install gasket (4) and fuel bowl (3) in fuel strainer head (6).

Swing bail (2) under the fuel bowl and tighten the bail nut (l).

Turn the fuel selector valve to the ON position.

5. ENGINE OVERHEATS.

Check oil level.

Step 1.

If oil level is low, fill to the proper level with recommended oil. Refer to LO 5-4320-273-12 (fig. 3-l).

Check that all air shrouding is unclogged undamaged, and in place.

Step 2.

Remove foreign matter from air shrouding. Tighten loose shrouding, Notify organizational maintenance of

other damage.

6. ENGINE RUNS BUT LACKS POWER

Step 1.

Check to ensure throttle control is in full speed position.

If throttle control is not in full speed position, pull out throttle control to provide full speed operation,

Check for dirty or incorrect grade of oil.

Step 2.

Service the engine.

Place a suitable container under the engine drain port before you remove the oil pan drain plug. Allow the

oil to drain fully.

Install the oil pan drain plug. Remove the oil filler cap and pour five (5) quarts of oil into the engine. (One

extra quart if the oil filter element was changed.)

Check that all air shrouding is unclogged undamaged and in place.

Step 3.

Remove foreign matter from air shrouding. Tighten loose shrouding. Notify organizational maintenance of

other damage.

7. ENGINE RUNS BUT LACKS POWER.

Check to ensure throttle control is in full speed position.

Step 1.

If throttle control is not in full speed position, pull out throttle control to provide full speed operation.

Step 2.

Check for a dirty air cleaner element.

Service the air cleaner any time the air restriction indicator shows red in the sight area.

Loosen clamp assembly (1, fig. 3-4) and remove the dust cap (2) and vacuator valve (3). Remove the baffle (4)

and empty the dust cap. Remove the wing nut (5), filter element (6) and clean with compressed air, directing

the air stream from the inside out.

3-7