PLATE 6G7339 - Caterpillar

Tests For The Air Inlet Heater
Illustration 1 g00538493
Right side of the engine
(1) Air inlet heater
(2) Fuel supply line
(3) Fuel transfer pump
Illustration 2 g00538494
(4) Electrical connection
(5) Fuel inlet
(6) Ball valve
(7) Valve holder
(8) Wire coil
(9) Ignition coil The air inlet heater (1) is located in the air inlet manifold on the right side of the engine.Basic Operation
The air inlet heater frequently appears to leak because the ignition coil (9) is wet. The air inlet heater may be wet because the diesel fuel does not burn completely. This condition is normal. This condition does not indicate that the ball valve (6) has fuel leakage. If a leak is suspected, perform the leakage test.Check the heater operation by determining if the inlet manifold is warm to the touch near the heater after approximately ten seconds of operation. The inlet manifold should be warm.Inspect the fuel tank and the fuel supply line (2) to the air inlet heater for restrictions and leakage of fuel. Fuel flow through the heater should be 3.5 to 5.9 cc/min (0.21 to 0.36 cu in/min).Check the fuel shutoff valve for correct operation. A poor seal on the fuel shutoff valve can cause air to enter the system which will cause extra cranking of the engine before starting. Be sure that all fuel connections are not leaking air.Make sure that the battery condition and the battery charge are satisfactory. Make sure that all electrical connections are tight. The electrical system can have reduced voltage if the following conditions exist:
A discharged battery
A loose connectionReduced voltage may cause slow cranking of the starter motor and failure of the heater unit to be activated.
If operated for a long period of time, The air inlet heater can create excessive heat. Excessive heat can damage the air inlet heater.
Leak Test For The Air Inlet Heater On The Engine
Use the following procedure in order to test for a leak in the air inlet heater.
Disconnect the fuel supply line (2) and the electrical connection on the air inlet heater. Be sure that the electrical connector is insulated from contact with metal engine components. Remove the air inlet heater from the manifold. Place a suitable plug in the manifold in order to prevent debris from entering the air inlet manifold.
Connect the fuel