BOSS 3007710 - Caterpillar

The Engine Coolant Is Too Hot
Probable Cause
Restricted flow of air through the radiator or restricted flow of coolant through the radiatorRemove all of the flow restrictions.
Low coolant levelAdd coolant to the cooling system. Check for leaks.
Faulty pressure capCheck operation of the pressure cap. Install a new pressure cap, as required.
Combustion gases in coolantFind the source of the leakage of combustion gases into the cooling system. Make repairs, as required:
Cylinder liner
Water cooled valve seat insert
Faulty water temperature regulatorsCheck water temperature regulators for correct operation. Check the water temperature gauge for correct operation. Install new parts, as required.
Faulty water pumpMake repairs to the water pump, as required.
Too much load on the systemReduce the load on the system.
Wrong fuel injection timingMake adjustment to timing. Refer to Testing And Adjusting, "Fuel System".Engine Temperature Is Too Cool
Probable Cause
Excessive idle timeDo not idle the engine for long time periods.
Very light loadsVery light loads can cause overcooling. Low heat into the engine causes overcooling.
Faulty water temperature regulatorsCheck water temperature regulators for correct operation. Check the water temperature gauge for correct operation. Install new parts, as required.Coolant Leaks Outside The Engine And Coolant Leaks Inside the Engine
Probable Cause
Coolant leaks in hoses or coolant leaks in hose connections.Check all hoses and connections for signs of leakage. Repair the damaged parts or replace the damaged parts.
Leaks in the water pump.Check the water pump for leaks before starting the engine. Then start the engine and look for leaks. Repair the damaged parts or replace the damaged parts.
Cylinder head gasket leakageLook for leaks along the surface of the head gasket. If leaks are present replace the head gasket.
Crack(s) in the cylinder headCracks in the cylinder head will allow coolant to flow into the crankcase. Repair the cylinder head or replace the cylinder head.
Crack(s) in the cylinder blockCracks in the cylinder block will allow coolant to flow into the crankcase. Repair the cylinder block or replace the cylinder block.The Exhaust Temperature Is Too High
Probable Cause
Restriction at the air inlet system or the exhaust systemRemove the restriction.
Wrong fuel injection timingMake adjustment to timing. Refer to Testing And Adjusting, "Fuel System".The Starting Motor Does Not Turn
Probable Cause
Low output from the batteryCheck the condition of the battery. Charge or replace the battery, as required.
Faulty wires or switchesRepair the wires or the switches or replace the wires or the switches, as required.
Faulty starting motor solenoidInstall a new starting motor solenoid.The Alternator Gives No Charge
Probable Cause
Loose drive belt for the alternatorAdjust the drive belt in order to obtain the correct tension.
Faulty charging, ground return circuit or battery connectionsInspect all cables and connections. All connections should be cleaned and tightened. Replace all faulty parts.
Brushes in the alternator are faulty. Install new brushes.
Faulty rotor (field coil)Install a new rotor.The Alternator Charge Rate Is Low Or The Alternator Charge Rate Is Not Regular
Probable Cause
Loose drive belt for the alternatorAdjust the drive belt in order to obtain the correct tension.
Faulty charging, ground return circuit or battery connectionsInspect all cables and connections. All connections should be cleaned and tightened. Replace all