Failure of Fuel Temperature Sensors in Fuel Metering Valves on Certain G3500B Engines{1917, 1924} Caterpillar

Engine:

G3508B (S/N: RBK1-UP)

G3512B (S/N: JHH1-UP)

G3512E (S/N: GYM1-UP)

G3516B (S/N: JEF1-UP)

Introduction

The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.

Problem

The 264-4297 Temperature Sensor has failed in some of the following fuel metering valves in the above G3500B Engines:

• 343-1902 Fuel Valve Gp

• 324-2782 Fuel Valve Gp

When a fuel temperature sensor fails, the temperature is not measured accurately, causing erratic engine operation.

Solution

Use the following procedure to replace the fuel temperature sensor.

1. Stop the engine. Ensure that the engine control switch is in the OFF position. The fuel metering valve must be powered off. Lock out and tag out the equipment.

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Illustration 1	g02787161

2. Use a screwdriver to remove the four screws from the cover of the fuel metering valve.

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Illustration 2	g02787177

3. Disconnect the harness from the fuel temperature sensor. Use a 7/8 inch deep well socket to remove the sensor.

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Illustration 3	g02787280

4. Install a new 264-4297 Temperature Sensor . Tighten the sensor to 20 ± 3 N·m (15 ± 2 lb ft).

5. Inspect the harness connector for the sensor. Make sure that the 155-2261 Plug Lock Wedge is installed in order to retain the connector sockets.

   If the wedge is not installed, obtain a 155-2270 Connecting Plug Kit . Take the 155-2261 Plug Lock Wedge and install the wedge into the harness connector.

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Illustration 4	g02788016

6. Connect the harness to the sensor.

7. Install the cover for the fuel metering valve. Tighten the screws to 17 ± 1 N·m (13 ± 1 lb ft).

8. Turn the engine control switch to the STOP position. Confirm that the reading of the fuel temperature sensor is correct.

9. Return the engine to service. Monitor the engine performance in order to ensure that the proper levels of exhaust emissions are maintained.