Engine Loses Power; Engine Knocks; Excessive Black Smoke From Exhaust; Excessive White Smoke From Exhaust - Toro 520XI Service Manual

Engine loses power.

Possible Cause
Insufficient combustion air supply
Air in fuel
Dirt, water, or stale fuel is in the fuel system
Faulty injection nozzle(s)
Incorrect injection pump timing
Faulty injection pump
Low compression
The vent hole in the fuel tank vent fitting is plugged
The engine load is excessive
The crankcase oil level is incorrect

Engine knocks.

Possible Cause
Sticking injection nozzles
Incorrect injection pump timing
Excessive carbon build-up
Internal wear or damage

Excessive black smoke from exhaust.

Possible Cause
Insufficient combustion air supply
Incorrect injection pump timing
Improper fuel
Faulty injection nozzles

Excessive white smoke from exhaust.

Possible Cause
Low engine temperature
Inoperative glow plugs
Faulty injection nozzles
Incorrect injection pump timing
Low compression
5xi Series Tractor Service Manual
DIESEL ENGINE
Corrective Action
Check air filter and combustion air path
Bleed nozzles, check for leaks on suction side of
system
Drain and flush fuel system; add fresh fuel
Test nozzles, clean or replace as necessary
Perform complete timing procedure
Repair or replace as necessary
Perform cylinder leakage test
Repair or replace vent system
Reduce ground speed
Fill or drain to the full mark
Corrective Action
Clean or replace nozzles
Perform complete timing procedure
Clean carbon from cylinder head and piston
Inspection required
Corrective Action
Check air filter and combustion air path
Perform complete timing procedure
Drain fuel system and refill with specified fuel
Clean or replace nozzles
Corrective Action
Check thermostat
Check fuse, glow plugs, and wiring
Clean or replace nozzles
Perform complete timing procedure
Perform cylinder leakage test
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