Service Manual

Engine knocks.
Possible Cause Corrective Action
Sticking injection nozzles Clean or replace nozzles
Incorrect injection pump timing Perform complete timing procedure
Excessive carbon build-up Clean carbon from cylinder head and piston
Internal wear or damage Inspection required
Excessive black smoke from exhaust.
Possible Cause Corrective Action
Insufficient combustion air supply Check air filter and combustion air path
Incorrect injection pump timing Perform complete timing procedure
Improper fuel Drain fuel system and refill with specified fuel
Faulty injection nozzles Clean or replace nozzles
Excessive white smoke from exhaust.
Possible Cause Corrective Action
Low engine temperature Check thermostat
Inoperative glow plugs Check fuse, glow plugs, and wiring
Faulty injection nozzles Clean or replace nozzles
Incorrect injection pump timing Perform complete timing procedure
Low compression Perform cylinder leakage test
5
Engine loses power.
Possible Cause Corrective Action
Insufficient combustion air supply Check air filter and combustion air path
Air in fuel Bleed nozzles, check for leaks on suction side of
system
Dirt, water, or stale fuel is in the fuel system Drain and flush fuel system; add fresh fuel
Faulty injection nozzle(s) Test nozzles, clean or replace as necessary
Incorrect injection pump timing Perform complete timing procedure
Faulty injection pump Repair or replace as necessary
Low compression Perform cylinder leakage test
The vent hole in the fuel tank vent fitting is plugged Repair or replace vent system
The engine load is excessive Reduce ground speed
The crankcase oil level is incorrect Fill or drain to the full mark
5
DIESEL ENGINE
5xi Series Tractor Service Manual 5-5