TM 5-3740-214-14
Table 5-3. Direct and General Support Maintenance Troubleshooting (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ENGINE LACKS POWER (Continued)
(2)
Set the float level. Turn the carburetor upside down and let the float rest on the needle. The
clearance between the machined surface of the carburetor and the free end of the float should
be 0.17 inches 0.03 inches (4.32 mm 0.76 mm).
(3)
Adjust the clearance by bending the float tab with a screwdriver if necessary.
(4)
Install a new baffle gasket, a new bowl gasket, the fuel bowl and fuel bowl screw and gasket.
Make sure the bowl gasket seats well.
(5)
Return the carburetor to the engine and go to Step 1f. Make sure the carburetor to manifold
gasket seals well.
f.
Start the engine.
(1)
If the engine starts, the problem is solved. Go to Step 1g.
(2)
If the engine does not start, go to Step 2.
g.
Adjust the carburetor while the engine is running.
(1)
Turn the main fuel needle valve to the right (clockwise) until the engine slows down.
(2)
Turn the main fuel needle valve back to the left (counterclockwise) until the engine slows down.
(3)
Turn the main fuel needle valve back to the right to a position halfway between the slow down
points.
h.
Readjust the carburetor adjusting needle valves.
(1)
Turn the main fuel adjusting needle all the way in to gently touch bottom. Then turn it out two
full turns.
i.
Start the engine.
(1)
If the engine runs correctly, the problem is solved.
(2)
If the engine still lacks power, go to Step 2.
Step 2.
Check the breaker points.
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