Service Manual

Engine is difficult to start.
Possible Cause Corrective Action
Improper starting procedure Activate glow plugs before attempting to start
Air in fuel Bleed nozzles, check for leaks on suction side of
system
Inoperative glow plugs Check fuse, glow plugs, and wiring
Insufficient combustion air supply Check air filter and combustion air path
Faulty injection nozzles Test nozzles, clean or replace as necessary
Clogged fuel filter Replace
Incorrect injection pump timing Perform complete timing procedure
Low ambient temperature Activate block heater, check oil viscosity
Worn injection pump (hard starting warm) Check fuel supply from nozzles
Low compression Perform cylinder leakage test
Engine runs but knocks or misses.
Possible Cause Corrective Action
Air in fuel Bleed nozzles, check for leaks on suction side of
system
Dirt, water, or stale fuel in fuel system Drain and flush fuel filter; add fresh fuel
Faulty injection nozzle(s) Test nozzles, clean or replace as necessary
Low compression Perform cylinder leakage test
Engine will not idle.
Possible Cause Corrective Action
Air in fuel Bleed nozzles, check for leaks on suction side of
system
Idle speed too low Adjust idle speed
The fuel injection pump is faulty Repair or replace as necessary
The fuel tank vent is restricted Check hoses, clean, or replace
Dirt or water is in the fuel system Drain and flush fuel system; add fresh fuel
Engine overheats.
Possible Cause
Corrective Action
(3) air intake screens are dirty Clean with every use
More coolant is needed Check and add coolant
Restricted air flow through radiator Clean debris from radiator and cooling air path
Defective thermostat Replace the thermostat
The crankcase oil level is incorrect Fill or drain to the full mark
Faulty thermostat Replace
Excessive loading Reduce load; use lower ground speed
TROUBLESHOOTING (cont’d)
5
DIESEL ENGINE
5-4 5xi Series Tractor Service Manual