Thermo King T-500R Maintenance Manual page 262

Condition
Engine runs hot
Oil pressure too low or drops
suddenly
High oil consumption
Blue Smoke (oil consumption)
White Smoke (fuel is not burning)
Possible Cause
Engine coolant is low
Dirty or plugged radiator
Cooling system heavily scaled
Water pump leaks
Worn or loose belt
Cylinder head gasket leaks (bubbles
appear in radiator if cylinder gasket
is leaking)
Faulty thermostat
Insufficient oil in pan
Leak in oil line
Oil relief valve sticking
Faulty oil pressure sensor
Worn oil pump, camshaft, main or
connecting rod bearings, loose oil
gallery plug, oil in water through
crack
Oil leakage
Clogged air cleaner
Damaged valve seals
Worn valve stem or valve guides
Broken piston rings or cylinder bore
worn or scored
Crankcase breather clogged
Excessive oil consumption
Cold engine
Low compression
Incorrect timing
Air or water in fuel
Insufficient preheat
Mechanical Diagnosis
Remedy
Add coolant slowly while engine is in
operation
Clean radiator
Clean cooling system
Repair or replace water pump
Replace belt or adjust
Replace cylinder head gasket.
Correct gasket
Check or replace the thermostat
Refill oil base after correcting cause
of loss
Tighten oil line fittings
Disassemble and clean oil pressure
regulator valve
Check oil line to oil pressure sensor
to see if it is blocked. Check oil
pressure sensor. Replace if
necessary
Repair engine
Check and eliminate possible
causes
Clean air cleaner
Replace seals on valve stem
Replace valves and valve guides
Have engine repaired. Replace
broken piston rings
Clean crankcase breather
See "High oil consumption". Repair
as necessary
Allow engine to warm up
Check and eliminate possible
causes. Repair as necessary
Readjust timing
Bleed system. Replace filters, clean
fuel system, drain and clean tank
and check supply tank for water.
Use known good fuel
Check glow plugs
13-4