TM 9-2320-289-20
Table 2-3. Mechanical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
Knocking and rattling will result if air cleaner wingnut is loose.
Step 1.
Check tailpipe, muffler, and exhaust pipe for improper positioning and damage.
Reposition and tighten mounting hardware.
Replace any damaged components. (See paragraph 3-27)
Step 2.
Check engine mounts and insulators for looseness and damage.
Tighten bolts securing mounts to frame or engine if loose. If there is any
damage, notify your supervisor.
Step 3.
Check alternator belts for improper tension or damage.
Adjust or replace if damaged. (See paragraph 4-2 or 4-3)
Step 4.
If knock is still evident, notify your supervisor.
31. WILL NOT SHUT OFF USING KEY
NOTE
Ground wire for ignition switch goes to top of parking brake bracket. If
ground wire is broke, engine will not shut off if light switch is on.
Step 1.
With engine at idle, pinch flexible part of the fuel return line at fuel injector pump to
stop engine. Notify your supervisor.
EXHAUST SYSTEM
32. EXCESSIVE NOISE OR LEAKING EXHAUST GASES
WARNING
Before checking for looseness, damage, or restrictions, allow exhaust
system to cool. Failure to follow this warning will result in serious burns.
Step 1.
Check tailpipe, muffler,
damage, or restrictions.
Tighten or replace
3-28)
exhaust manifolds, and exhaust
any damaged components. (See
pipe for looseness,
paragraphs 3-27 and
Change 2
2-47
