Thermo King MD-MT, Operator'S Manual

Page: 138 / 192

Mechanical Diagnosis
138
Engine stops after starting Air in injection pump Bleed fuel system
Fuel filter obstructed Replace filter element
High head pressure Eliminate cause of high head
pressure
Vent of fuel tank obstructed Unclog vent
Reset switch trips Check engine oil, coolant level, and
CYCLE-SENTRY system (optional).
Push in reset switch
Circuit breaker tripping Check for short circuit in unit wiring
Clogged fuel tank or fuel lines Clean fuel tank and fuel lines
Defective electric fuel pump Check fuel pump
Engine does not develop full
power Air intake system clogged Clean air intake system
Fuel tank vent clogged Unclog vent
Clogged fuel tank or fuel lines Clean fuel tank and fuel lines
Speed adjustment wrong Adjust speed
Insufficient fuel volume leaving filter Check for dirty filter or air in system
Defective electric fuel pump Check fuel pump
Injection pump timing off Adjust timing
Nozzles defective Repair or replace nozzles
Compression low or unbalanced Overhaul engine
Worn injection pump plungers,
delivery valve defective, injection
rate too low, gum formations Repair or replace pump
Engine speed too high Misadjusted speed solenoid Adjust speed solenoid
Defective injection pump Repair injection pump
Engine fails to stop when unit is
Off Fuel solenoid defective Replace
Defective injection pump Replace pump
Engine knocks heavily Air in system Bleed fuel system
Injection pump not timed Retime injection pump
Wrong fuel Check fuel
Compression too low Overhaul engine
Injection nozzles fouled or opening
pressure too low Clean, repair or replace injection
nozzles
Valve out of adjustment Adjust valves
Fuel return line plugged Remove return line restriction
Rod or main bearing worn Replace rod or main bearings
Condition Possible Cause Remedy