HOSE AS 2779077 - Caterpillar

Illustration 3 g01142103
Engine speed/timing sensors (4) Bracket (5) Secondary speed/timing sensor (6) Mounting plate (7) O-ring seals (8) Bracket (9) Primary speed/timing sensor
Remove the suspect engine speed/timing sensor from the engine.
Ensure that O-ring seals (7) are installed on sensors (5) and (9) , and on mounting plate (6) . Ensure that the O-ring seals are free of damage.Expected Result:All of the O-ring seals are properly installed and free of damage. The bracket is free of damage.Results:
OK - The O-ring seals are properly installed. The bracket and the seals are free of damage.Repair: Perform the following procedure in order to properly install a sensor assembly:
Lubricate the O-ring seals with oil.
Fully seat each sensor into the housing.Note: If the sensor assembly will not fully seat into the engine, replace the sensor assembly.
Tighten the bolt for brackets (4) and (8) .
Connect the connector and verify that the latch tab of the connector is securely locked.
Ensure that the harness is properly secured, and that the tie-wraps are placed in the correct location. Proceed to Test Step 3.
Not OK - At least one of the sensor assembly's components is not OK.Repair: Obtain a new sensor assembly. Perform the following procedure in order to properly install the sensor assembly:Note: Do not switch the positions of the sensors. The sensors are not interchangeable. A timing calibration is not required when the sensors are replaced.
Lubricate each O-ring with oil.
Fully seat the sensor into the housing.
Tighten the bracket bolt.
Connect the connector and verify that the latch tab of the connector is securely latched.
Ensure that the harness is properly secured, and that the tie-wraps are placed in the correct location.Verify that the problem is resolved.STOPTest Step 3. Inspect the Electrical Connectors and the Wiring
Ensure that the keyswitch is in the OFF position.
Illustration 4 g01252480
Locations of the engine speed/timing sensors (typical left side engine view) (10) Primary speed/timing sensor connector (11) Secondary speed/timing sensor connector (12) J2/P2 ECM connectors
Thoroughly inspect connectors (10) , (11) , and (12) . Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 5 g01237789
P2 connector (P2-25) Primary engine speed/timing (-) (P2-35) Primary engine speed/timing (+) (P2-46) Secondary engine speed/timing (+) (P2-47) Secondary engine speed/timing (-)
Illustration 6 g01155187
Connector for the engine speed/timing sensors (1) Sensor return (2) Sensor signal
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the engine speed/timing sensor.
Check the allen head screw for each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and wiring for abrasion and for pinch points from the engine speed/timing sensors to the ECM.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The harness and the wiring appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem in the connectors and/or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of