TM 5-3740-21 414
Table 5-3. Direct and General Support Maintenance Troubleshooting (Continued)
TEST OR INSPECTION
ENGINE DOES NOT START BUT TURNS OVER (Continued)
Inspect the carburetor to manifold gasket. If it is cracked, broken, or damaged, replace it and go
to Step 10d.
d. Disassemble the carburetor and make sure gasoline is getting to the carburetor.
Remove the bowl screw, gasket and bowl, and baffle gasket.
Remove the float pin, float needle and needle seat. If the float leaks or is worn, replace it.
Check the needle and seat for damage. If they are cut or scratched, replace them.
DO NOT use hard metal objects or tools to clean the inlet port.
Use something soft like a
toothpick and flush the port with alcohol or acetone.
Unplug the inlet port if necessary.
If the choke is worn or the throttle damaged, replace the whole carburetor and go to Step 10b.
Figure 5-45. Carburetor Float Adjustment
e. Assemble the carburetor.
Install the seat, needle, float and pin.
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).