Table 4-3. Direct Support Troubleshooting (Cont).
4. Engine stalls under load.
Fuel pump is faulty.
Remove and disassemble carbure-
tor (see paragraph 7-8). Replace fuel
pump as necessary (see paragraph
5. Engine is noisy or knocking.
Bearings, piston rings, or cylinder
Disassemble engine and replace
wall is worn.
worn parts (see paragraph 6-3).
6. Engine has poor acceleration.
a. Fuel pump is faulty or carburetor
a. Remove and disassemble car-
buretor and inspect (see para-
graph 7-8) .Replace fuel pump as
necessary (see paragraph 7-8).
b. Engine compression is low.
b. Check engine compression (see
paragraph 6-5). Replace piston
rings if compression is low (see
7. No tamping operation while
a. Transmission clutch is faulty.
a. Disassemble the transmission
clutch (see paragraph 10-3).
b. Lower unit springs are faulty.
b. Disassemble lower unit (see
paragraph 13-3 or 13-4).