Thermo King SGCO 3000, Manual

Page: 133 / 144

Mechanical Diagnosis
133
Engine runs hot Coolant level is low Add coolant
Loose or worn water pump belt Replace belt
Generator overloaded Check load
Dirty radiator Wash radiator
Defective thermostat Check or replace thermostat
Cooling system heavily scaled Clean cooling system
Cylinder head gasket leaks Replace cylinder head gasket. Use
correct gasket
Oil pressure too low or
drops suddenly. Minimum
oil pressure for a hot
engine is 117 kPa, 1.17
bar, 17 psi (low oil
pressure switch setting) Insufficient oil in pan Add oil
Defective oil pressure sensor Check oil line to oil pressure sensor to
see if it is blocked. Check oil pressure
sensor. Replace if necessary
Oil relief valve sticking Disassemble and clean oil pressure
regulator valve
Worn oil pump, camshaft, main or
connecting rod bearings, loose oil gallery
plug Repair engine
High oil consumption Oil leakage Check and eliminate possible causes at
cylinder head cover, oil lines, oil filter,
front timing cover or crankshaft seals
Clogged air cleaner system Clean air intake system; clean and refill
oil reservoir on oil bath air cleaner; or
replace dry air cleaner filter
Clogged crankcase breather Clean breather system
Damaged valve seals Replace seals on valve stem
Worn valve stem Replace valves
Poor compression Check and eliminate possible causes.
Repair as necessary
Broken piston rings or cylinder bore worn
or scored Have engine repaired and re-bored.
Replace broken piston rings
Battery is not recharging
system charging system Loose connections in electrical system Check all electrical connections and
charging system
Battery defective Replace battery
Air heater does not shut off Check preheat relay and preheat circuit
Controller defective Replace controller
Diagnosing Unit Conditions
Condition Possible Cause Remedy