Engine - (Lack of Power) Troubleshooting

BULLETIN NUMBER ISSUE DATE
GROUP
SB87-02-001 February 6, 1987
FUEL
DIESEL ENGINE "LACK OF POWER" TROUBLESHOOTING

Figure 1 - DIESEL FUEL INJECTION PUMP ASSEMBLY:

VEHICLES AFFECTED

I-Mark (PF), P'UP (KB) and Trooper II (KT) models with diesel engine.

SERVICE INFORMATION

The inlet fuel line joint bolt and the overflow line bolt on the diesel engine injection pump have built-in filter screens. If these screens become partially plugged, the engine will gradually lose power.

These parts should be removed, inspected and cleaned when troubleshooting any "lack of power" complaint.
SERVICE PROCEDURE

1. To service the inlet fuel line joint bolt (Figure 1):

a. Remove the bolt from the pump.
b. Wash the bolt in solvent or clean diesel fuel.
c. Inspect the filter screen inside the bolt (Figure 2). If contaminants can be seen, apply low-pressure shop air to the bottom of the bolt to dislodge the particles.
d. Wash the bolt again to remove any contaminants.
e. Install the bolt on the pump.

Figure 1 - DIESEL FUEL INJECTION PUMP ASSEMBLY:

Figure 2 - Overflow Line Bolt:

2. To service the overflow line bolt (Figure 1):

a. Remove the advancer joint bolt to free the lower end of the overflow pipe.
b. Remove the overflow line bolt and overflow pipe.

Figure 3 - Bleed Screw:

c. Remove the bleed screw from the end of the overflow line bolt (Figure 3) and wash the bolt in solvent or clean diesel fuel.
d. Inspect the filter screen inside the bolt. If contaminants can be seen, apply low-pressure shop air to the bleed screw hole to dislodge the particles.
e. Wash the bolt again to remove any contaminants.
f. Install the bleed screw into the bolt. Install the overflow line, overflow bolt and advancer joint bolt onto the pump.