82499M Mariner SCREW

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Tests For The Air Inlet Heater
Illustration 1 g00659338
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 coilThe 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 10 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.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 electric starting 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 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 to prevent debris from entering the air inlet manifold.
Connect the fuel supply line to the air inlet heater. Loosely tighten the connection fitting. Operate the priming lever of the fuel transfer pump until only fuel which is free of air flows from the connection. Tighten the connection fitting.
Work carefully around an engine that is running. Engine parts that are hot, or parts that are moving, can cause personal injury.
Start the engine and operate the engine at low speed. Check that there is no fuel leakage from the valve of the air inlet heater.
If leakage exists, the air inlet heater must be replaced. If no fuel leakage occurs, remove the plug from the inlet manifold and disconnect the fuel supply line from the air inlet heater. Install the air inlet heater in the air inlet manifold. Connect the fuel supply line to the heater. Operate the priming lever of the fuel transfer pump until only fuel which is free of air flows from the connection. Connect the electrical wire connector.Leak Test For The Air Inlet Heater Off The Engine
Use this test to test for leakage of fuel in the air inlet heater if a pressurized air supply is available.
The air inlet heater may be damaged if more than 140 kPa (20 psi) of air pressure is used.
Pressurized air can cause personal injury. When pressurized air is used for cleaning, wear a protective face shield, protective clothing, and protective shoes.
Remove the air inlet heater from the inlet manifold. Connect an air supply to the fuel inlet passage. The maximum pressure of the air supply should be 140 kPa (20 psi).
Put the air inlet heater in a container of clean diesel fuel for 10 seconds. No air bubbles should be visible from the air inlet heater. If the air inlet heater is not faulty, remove the fuel from the air inlet heater. Reinstall the air inlet heater in the air inlet manifold. If leakage of air occurs, install a new air inlet heater.Electrical Test