Thermo King T-500R Maintenance Manual page 261

Condition
Engine does not reach full power
Engine is sooting heavily, emits
thick black clouds of smoke
(excessive fuel to air ratio)
Engine knocks
Possible Cause
Air or dirt in fuel system
Fuel line leaks
Speed adjustment wrong
Electric fuel pump does not run
correctly
Electric fuel pump filter dirty
Fuel filter plugged
Fuel tank vent clogged
Air in fuel system
Air filter clogged
Air intake system clogged
Injection pump timing off
Injection nozzles defective
Worn injection pump plungers,
delivery valve defective, injection
rate too low, gum formations
Cylinder head gasket leaking
Compression low or unbalanced
Restricted exhaust system
Wrong fuel
Clogged air intake system
Restricted exhaust system
Opening pressure of nozzle is
too low or needle sticks
Injection amount too great
Injection pump timing
Excessive load
Insufficient air
Air in fuel system
Engine is cold
Fuel return line plugged
Injection pump not timed
Injection nozzle fouled or opening
pressure too low
Dirty radiator
Worn engine parts
Mechanical Diagnosis
Remedy
Repair
Tighten connections of fuel lines. If
necessary, replace damaged lines
Adjust speed
Check voltage. Repair or replace
pump
Clean and replace diesel filter
Install new filter
Unclog vent
Bleed fuel system
Clean air filter
Clean air intake system
Adjusting timing
Repair or replace nozzles
Repair or replace injection pump
Replace gasket
Overhaul engine
Clean or replace restricted parts
Drain and refill with correct fuel
Clean air cleaner
Clean or replace
Repair nozzle. Replace if necessary
Have pump repaired
Check timing of injection pump
Check drive system and engine oil
pressure
Clean air filter
Bleed fuel system
Warm up
Remove restriction
Retime injection pump
Clean, repair or replace injection
nozzle
Clean radiator
Overhaul engine
13-3