SECTION 5
TROUBLESHOOTING
TABLE 5-2
TROUBLE ANALYSIS FOR DETROIT DIESEL FUEL SYSTEM.
CORRECTIVE ACTION
PROBABLE CAUSE
TROUBLE
Insufficient
Injector
Lap the injector body.
Poor bushing to body fit.
Holding Time
Tighten the nut to 75-85 ft.-lb.
Injector nut not tightened to
(10.4-11.8
kg-m)
torque.
specified torque.
Replace valve ports.
Cracked valve parts.
Lop the surface of the seat and
Valve seat chipped at point of
contact.
the I.D. of the hole.
Replace the spring. Check the
W orn or broken valve spring.
valve cage and valve stop for
wear, replace them if necessary.
Replace valve.
W orn valve.
Replace seal ring.
Defective seal ring.
Install new body plugs.
Body plug leaks.
Replace the filter gasket and
Filter gasket leaks.
tighten filter cops to 67-75
ft.-lb. (9.3-10.4 kg-m) torque.
Disassemble the injector and
Dirt or foreign material on
clean all parts.
injectors.
Clean orifice.
Spray tip or orifices partially
incorrect Fuel
plugged.
output
Replace the spray tip.
Spray tip orifice enlarged.
Clean injector tip.
Carbon buildup in tip.
Replace defective parts.
W orn plunger and bushing.
Replace cracked parts.
Cracked valve parts.
Replace plunger and bushing
Cracked bushing.
assembly.
Re-lap sealing surfaces.
Improperly lapped surfaces.
Disassemble the injector and
F o r e i g n material between valve
clean the parts.
and seat.
Assemble the gear with the
Rack and gear not in time.
drill spot mark on the tooth
engaged between the two marked
teeth of the rack.
5-41.
