Thermo King UT-1200, Manual

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Mechanical Diagnosis
152
Engine does not reach full power Air or dirt in fuel system Repair
Fuel line leaks Tighten connections of fuel lines. If
necessary, replace damaged lines
Speed adjustment wrong Adjust speed
Electric fuel pump does not run
correctly Check voltage. Repair or replace
pump
Electric fuel pump filter dirty Clean and replace diesel filter
Fuel filter plugged Install new filter
Fuel tank vent clogged Unclog vent
Air in fuel system Bleed fuel system
Air filter clogged Clean air filter
Air intake system clogged Clean air intake system
Injection pump timing off Adjusting timing
Injection nozzles defective Repair or replace nozzles
Worn injection pump plungers,
delivery valve defective, injection
rate too low, gum formations Repair or replace injection pump
Cylinder head gasket leaking Replace gasket
Compression low or unbalanced Overhaul engine
Restricted exhaust system Clean or replace restricted parts
Engine is sooting heavily, emits
thick black clouds of smoke
(excessive fuel to air ratio) Wrong fuel Drain and refill with correct fuel
Clogged air intake system Clean air cleaner
Restricted exhaust system Clean or replace
Opening pressure of nozzle is
too low or needle sticks Repair nozzle. Replace if necessary
Injection amount too great Have pump repaired
Injection pump timing Check timing of injection pump
Excessive load Check drive system and engine oil
pressure
Engine knocks Insufficient air Clean air filter
Air in fuel system Bleed fuel system
Engine is cold Warm up
Fuel return line plugged Remove restriction
Injection pump not timed Retime injection pump
Injection nozzle fouled or opening
pressure too low Clean, repair or replace injection
nozzle
Dirty radiator Clean radiator
Worn engine parts Overhaul engine
Condition Possible Cause Remedy