TM 5-3810-306-20
TABLE 3-1. ORGANIZATIONAL TROUBLESHOOTING (CONTD)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
d. If OK, do Step 2.
Step 2.
Engine running on fumes drawn into air intake.
a. Inspect air intake system for source of fumes. If none are found, do Step 3.
b. Correct source of fumes.
Step 3.
Fuel leaking to intake manifold.
a. Inspect fuel filter mounting at air intake for evidence of fuel leak.
b. Remove fuel filter and filter mounting. Correct source of leak.
6.
ROUGH IDLE, WARM ENGINE
Step 1.
Idle speed set too low.
a. Check low idle screw setting (500-600 RPM). If OK, do Step 2.
b. Adjust low idle screw setting. (Refer to page 5-20.)
Step 2.
Air in fuel system.
a. Bleed fuel system and check for suction leaks. If no air is detected, do Step 3. (Refer to page
5-12.)
Step 3.
Incorrect valve adjustment.
a. Check intake and exhaust valve clearances. If OK, do Step 4.
b. Adjust intake and exhaust valve clearances. (Refer to page 4-2.)
Step 4.
One or more cylinders losing compression.
a. Using STE/ICE, perform compression check to identify problem. (Refer to VTM test no. 14.) If
OK, do Step 5.
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