TM 5-2420-231-23-1
0012
Table 1. Engine Runs Rough or Is Unstable - Continued.
012
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Engine Runs Rough or Is
Test Step 3. Inspect Air Filter and
Unstable - Continued
Aspirator.
1. Observe the air filter restriction
Air Filter Restriction Indicator
indicator (Figure 4, Item 1) (TM 5-
Illuminated - Proceed to step 2.
2420-231-10). The air filter restric-
Air Filter Restriction Indicator Not
tion indicator should be illuminated
Illuminated - Diagnose air filter
for approximately 2 seconds.
restriction indicator (WP 0026) then
proceed to Test Step 5 to verify
symptom is resolved.
2. Start and idle engine (TM 5-2420-
231-10) for at least 30 seconds.
3. Observe the air filter restriction
Air Filter Restriction Indicator Not
indicator (TM 5-2420-231-10). The
Illuminated - Proceed to step 4.
air filter restriction indicator should
Air Filter Restriction Indicator
not be illuminated.
Illuminated - Turn ignition switch to the
off position (TM 5-2420-231-10).
Proceed to step 5.
Figure 4. Air Filter Restriction Indicator.
0012
4. Turn ignition switch to the off posi-
tion (TM 5-2420-231-10).
5. Remove the air cleaner primary
Primary/Secondary Air Filter
Element OK - Proceed to step 7.
and secondary elements and
inspect for dirt and debris (WP
Primary/Secondary Air Filter
0101).
Element Restricted With Dirt or
Debris - Replace primary and
secondary air filter elements (WP
0101).
Proceed to step 6.
