TM 5-3740-218-13&P
Table 4-2. Unit Troubleshooting
Malfunction
Test or Inspection
Corrective Action
Step 7.
Check for faulty carburetor.
Adjust:
Start engine and allow to warm up to normal operating
temperature. With engine idling, turn pilot screw in or out to
setting that produces highest idle rpm. Correct setting will
usually be obtained at approximately 2-1/4 turns out from
fully closed (slightly seated) position. After pilot screw is
correctly adjusted, turn throttle stop screw to obtain standard
idle speed of 1400 +150 rpm.
Adjust governor control rod:
Loosen nut on governor arm pinch bolt and move governor
arm shaft as far as it will go (in same direction governor
arm moves) up to open throttle. Start engine and allow to
warm up to normal operating temperature. Move throttle
lever to run engine at standard maximum speed of 3600 rpm.
Adjust throttle lever limiting screw so throttle lever cannot
be moved past that point.
If conditions still exist, replace carburetor (para 4-21).
3.
ENGINE STARTS, BUT FAILS TO KEEP RUNNING.
Step 1.
Check for insufficient fuel supply.
Add clean fuel (item 19, Appendix E).
Step 2.
Check for water in fuel or dirty fuel.
Drain fuel and replace with clean fuel (item 19, Appendix E).
Step 3.
Check for defective spark plug.
Remove and replace spark plug (para 4-25). Set gap to 0.039 in.
Step d4.
Check for defective hand control.
Replace hand control (para 4-38).
Step 5.
Check for faulty carburetor.
Refer to Malfunction 2, step 7.
Repair or replace (para 4-21).
4.
ENGINE OVERHEATS.
Check ,for dirty cooling fins and blower housing.
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