SEAL-O-RING 5P5874 - Caterpillar

If possible, download the "Warranty Report" from the engine ECM before performing this procedure.Probable Causes
Diagnostic codes
Parameters in the Electronic Control Module (ECM)
Electrical connectors
Air intake and exhaust system
Valve lash
Turbocharger
Fuel supply
Low compression (cylinder pressure)
Electronic unit injectors
Individual malfunctioning cylinderRecommended Actions
Do not crank the engine continuously for more than 30 seconds. Allow the starting motor to cool for two minutes before cranking the engine again.
Note: The procedures have been listed in order of probability. Complete the procedures in order.Note: If the problem only occurs under certain conditions, test the engine under those conditions. Examples of certain conditions are high engine speed, full load, and engine operating temperature. Troubleshooting the symptoms under other conditions can give misleading results.
Table 1
Troubleshooting Test Steps    Values    Results    
1. Diagnostic Codes
Note: Certain diagnostic codes and/or event codes may cause poor performance. Refer to in the electronic service tool.
A. Use the electronic service tool to check for active or logged codes.
B. Use the electronic service tool to check the histogram information if the engine has been derated.
Note: If the histograms contain engine derates and no diagnostic codes are present, then the engine is operating normally.
   
Derate or diagnostic codes
   
Result: A diagnostic code is present.
Troubleshoot the code and then reset the histogram.
Result: A diagnostic code is not present.
Proceed to Test Step 2.
   
2. Parameters in the Electronic Control Module (ECM)
A. Use the electronic service tool to verify that the correct parameters are being used. Refer to Troubleshooting, "System Configuration Parameters" for additional information.
   
Parameters
   
Result: The parameters are not correct.
Input the correct parameters. Refer to Troubleshooting, "Configuration Parameters" for additional information.
Result: The parameters are correct.
Proceed to Test Step 3.
   
3. Electrical connectors
A. Turn the isolator switch to the ON position.
B. Use the electronic service tool to check the intake manifold pressure.
C. Run the engine until the speed is equal to the maximum no-load speed.
C. Use the electronic service tool to make sure that the throttle is set to reach the maximum no-load speed.
   
Electrical connections
   
Result: The intake manifold pressure is not
zero 0.5 kPa (zero 0.070 psi).
Check the 5 VDC sensor supply for the intake manifold pressure. Refer to Troubleshooting, "Sensor Supply - Test".
Result: The throttle response is not as expected.
If the maximum no-load speed cannot be obtained refer to Troubleshooting, "Switch Circuits - Test" and Troubleshooting, "Mode Selection - Test".
Result: All responses are normal.
Proceed to Test Step 4.
   
4. Air Intake and Exhaust System
A. Observe the check engine lamp. Check for an air filter restriction indicator, if equipped. Replace a plugged air filters. Refer to the Operation and Maintenance Manual.
B. Check the air inlet and exhaust system for restrictions and/or leaks.
   
Restrictions
   
Result: There are restrictions in the air inlet or exhaust system.
Make the necessary repairs, Refer to Systems Operation/Testing and Adjusting, "Air Inlet and Exhaust System - Inspect" for additional information.
Result: There are no restrictions in the air inlet or exhaust system.
Proceed to Test Step 5.
   
5. Valve Lash
Note: The valve lash can affect the performance of the engine.
A. Check the valve