SEAL 7Y0423 - Caterpillar

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Exploded view of the engine speed/timing sensors (4) O-ring seals
Ensure that one O-ring (4) is installed on each sensor. Check the O-rings for damage. Replace the O-rings, if necessary.Expected Result:Two undamaged O-ring seals are properly installed. The brackets are not bent. The flange for each sensor can be flush against the housing.Results:
OK - Two undamaged O-ring seals are properly installed. The brackets are not bent. The flange for each sensor can be flush against the housing.Repair: Perform the following procedure in order to properly install a sensor assembly:
Lubricate the O-ring seal 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 latched on both sides.
Ensure that the harness is properly secured, and ensure that the harness is attached to the harness clip. Proceed to Test Step 3.
Not OK - The sensor assembly has a mechanical problem.Repair: Replace 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 the 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 latched on both sides.
Ensure that the harness is properly secured, and ensure that the harness is attached to the harness clip.Verify that the problem is resolved.STOPTest Step 3. Inspect the Electrical Connectors and the Wiring
Remove electrical power from the ECM.
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Typical left side engine view (5) connector for the primary engine speed/timing sensor (6) connector for the secondary engine speed/timing sensor (7) J2/P2 ECM connector
Thoroughly inspect the connectors for the engine speed/timing sensors (5) and (6). Refer to Troubleshooting, "Electrical Connectors - Inspect".
Illustration 5 g01339504
P2 connector (P2-25) Primary engine speed/timing signal (−) (P2-26) Timing calibration probe (+) (P2-35) Primary engine speed/timing signal (+) (P2-36) Timing calibration probe (−) (P2-46) Secondary engine speed/timing signal (+) (P2-47) Secondary engine speed/timing signal (−)
Illustration 6 g01218763
Terminal locations at the connector for the speed/timing sensors (1) Engine speed/timing signal (−) (2) Engine speed/timing 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 ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
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 wiring are OK. Proceed to Test Step 4.
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 the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.STOPTest Step 4. Measure the Sensor Resistance through the Engine Harness
Remove electrical power from