TM 5-2420-231-23-1
0012
Table 1. Engine Runs Rough or Is Unstable.
0012
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Engine Runs Rough or Is
Test Step 1. Inspect for Water in the
Unstable
Fuel Separator.
1. Turn ignition switch to the off posi-
tion (TM 5-2420-231-10).
2. Position drain pan under machine.
3. Open water separator drain valve
No Water Present - Close water
(Figure 1, Item 2) on fuel filter
separator drain valve (Figure 1, Item 2).
(Figure 1, Item 1) and drain fuel
Proceed to Test Step 2.
into drain pan until all water is
Water Present - Proceed to step 4.
drained from fuel filter (Figure 1,
Item 1).
4. Start and idle engine (TM 5-2420-
231-10) for approximately 2 min-
utes.
5. Turn ignition switch to the off posi-
tion (TM 5-2420-231-10).
6. Open water separator drain valve
No Water Present - Close water
(Figure 1, Item 2) and drain fuel
separator drain valve (Figure 1, Item 2).
into drain pan until all water is
Proceed to Test Step 5.
removed from fuel filter (Figure 1,
Water Present - Close water separator
Item 1).
drain valve (Figure 1, Item 2). Drain fuel
from fuel tank and ensure all water is
removed from fuel tank (WP 0136).
Replace fuel filter (WP 0147).
Proceed to Test Step 5.
Figure 1. Fuel Filter and Water Separator Drain Valve.
0012
