Thermo King UT-1200, Manual

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Mechanical Diagnosis
153
Engine runs hot Engine coolant is low Add coolant slowly while engine is in
operation
Dirty or plugged radiator Clean radiator
Cooling system heavily scaled Clean cooling system
Water pump leaks Repair or replace water pump
Worn or loose belt Replace belt or adjust
Cylinder head gasket leaks (bubbles
appear in radiator if cylinder gasket
is leaking) Replace cylinder head gasket.
Correct gasket
Faulty thermostat Check or replace the thermostat
Oil pressure too low or drops
suddenly Insufficient oil in pan Refill oil base after correcting cause
of loss
Leak in oil line Tighten oil line fittings
Oil relief valve sticking Disassemble and clean oil pressure
regulator valve
Faulty oil pressure sensor Check oil line to oil pressure sensor
to see if it is blocked. Check oil
pressure sensor. Replace if
necessary
Worn oil pump, camshaft, main or
connecting rod bearings, loose oil
gallery plug, oil in water through
crack Repair engine
High oil consumption Oil leakage Check and eliminate possible
causes
Clogged air cleaner Clean air cleaner
Damaged valve seals Replace seals on valve stem
Worn valve stem or valve guides Replace valves and valve guides
Broken piston rings or cylinder bore
worn or scored Have engine repaired. Replace
broken piston rings
Crankcase breather clogged Clean crankcase breather
Blue Smoke (oil consumption) Excessive oil consumption See “High oil consumption”. Repair
as necessary
White Smoke (fuel is not burning) Cold engine Allow engine to warm up
Low compression Check and eliminate possible
causes. Repair as necessary
Incorrect timing Readjust timing
Air or water in fuel Bleed system. Replace filters, clean
fuel system, drain and clean tank
and check supply tank for water.
Use known good fuel
Insufficient preheat Check glow plugs
Condition Possible Cause Remedy