TM 5-2420-231-23-1
0015
Table 1. Engine Has Excessive Black or Dark Gray Smoke.
0015
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Turn ignition switch to the on posi-
Engine Has Excessive Black
tion (TM 5-2420-231-10).
or Dark Gray Smoke
2. Observe air filter restriction indica-
Air Filter Restriction Indicator
tor (Figure 1, Item 1) (TM 5-2420-
Illuminated - Proceed to step 3.
231-10). Air filter restriction indica-
Air Filter Restriction Indicator Not
tor should be illuminated for
Illuminated - Diagnose air filter
approximately 2 seconds.
restriction indicator (WP 0026) then
proceed to step 16 to verify symptom is
resolved.
3. Start and idle engine for at least 30
seconds (TM 5-2420-231-10).
4. Observe air filter restriction indica-
Air Filter Restriction Indicator Not
Illuminated - Proceed to step 15.
tor (Figure 1, Item 1) (TM 5-2420-
231-10). Air filter restriction indica-
Air Filter Restriction Indicator
Illuminated - Proceed to step 5.
tor should not be illuminated.
Figure 1. Air Filter Restriction Indicator.
0015
5. Turn ignition switch to the off posi-
tion (TM 5-2420-231-10).
6. Inspect the air cleaner primary and
Primary/Secondary Air Filter
Element OK - Proceed to step 8.
secondary elements for dirt or
debris (WP 0101).
Primary/Secondary Air Filter
Element Restricted With Dirt or
Debris - Replace primary and
secondary air filter elements (WP
0101).
Proceed to step 7.
