G3600 A4 Engines Exhaust Temperature Is High Caterpillar


Exhaust Temperature Is High
`
1.1. Probable Causes
2.1. Recommended Actions

Use this procedure in order to troubleshoot a high exhaust temperature. Also, use this procedure if one of the following event codes is active or logged.

Table 1
J1939 Code and Description  Comments 
1137-0
Engine Exhaust Gas Port 1 Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
1138-0
Engine Exhaust Gas Port 2 Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
1139-0
Engine Exhaust Gas Port 3 Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
1140-0
Engine Exhaust Gas Port 4 Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
1141-0
Engine Exhaust Gas Port 5 Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
1142-0
Engine Exhaust Gas Port 6 Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
1143-0
Engine Exhaust Gas Port 7 Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
1144-0
Engine Exhaust Gas Port 8 Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
1145-0
Engine Exhaust Gas Port 9 Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
1146-0
Engine Exhaust Gas Port 10 Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
1147-0
Engine Exhaust Gas Port 11 Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
1148-0
Engine Exhaust Gas Port 12 Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
1149-0
Engine Exhaust Gas Port 13 Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
1150-0
Engine Exhaust Gas Port 14 Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
1151-0
Engine Exhaust Gas Port 15 Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
1152-0
Engine Exhaust Gas Port 16 Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 

Table 2
J1939 Code and Description  Comments 
1137-15
Engine Exhaust Gas Port 1 Temperature : High - least severe (1) 
The code is logged. 
1138-15
Engine Exhaust Gas Port 2 Temperature : High - least severe (1) 
The code is logged. 
1139-15
Engine Exhaust Gas Port 3 Temperature : High - least severe (1) 
The code is logged. 
1140-15
Engine Exhaust Gas Port 4 Temperature : High - least severe (1) 
The code is logged. 
1141-15
Engine Exhaust Gas Port 5 Temperature : High - least severe (1) 
The code is logged. 
1142-15
Engine Exhaust Gas Port 6 Temperature : High - least severe (1) 
The code is logged. 
1143-15
Engine Exhaust Gas Port 7 Temperature : High - least severe (1) 
The code is logged. 
1144-15
Engine Exhaust Gas Port 8 Temperature : High - least severe (1) 
The code is logged. 
1145-15
Engine Exhaust Gas Port 9 Temperature : High - least severe (1) 
The code is logged. 
1146-15
Engine Exhaust Gas Port 10 Temperature : High - least severe (1) 
The code is logged. 
1147-15
Engine Exhaust Gas Port 11 Temperature : High - least severe (1) 
The code is logged. 
1148-15
Engine Exhaust Gas Port 12 Temperature : High - least severe (1) 
The code is logged. 
1149-15
Engine Exhaust Gas Port 13 Temperature : High - least severe (1) 
The code is logged. 
1150-15
Engine Exhaust Gas Port 14 Temperature : High - least severe (1) 
The code is logged. 
1151-15
Engine Exhaust Gas Port 15 Temperature : High - least severe (1) 
The code is logged. 
1152-15
Engine Exhaust Gas Port 16 Temperature : High - least severe (1) 
The code is logged. 

Table 3
J1939 Code and Description  Comments 
1137-16
Engine Exhaust Gas Port 1 Temperature : High - moderate severity (2) 
The code is logged. 
1138-16
Engine Exhaust Gas Port 2 Temperature : High - moderate severity (2) 
The code is logged. 
1139-16
Engine Exhaust Gas Port 3 Temperature : High - moderate severity (2) 
The code is logged. 
1140-16
Engine Exhaust Gas Port 4 Temperature : High - moderate severity (2) 
The code is logged. 
1141-16
Engine Exhaust Gas Port 5 Temperature : High - moderate severity (2) 
The code is logged. 
1142-16
Engine Exhaust Gas Port 6 Temperature : High - moderate severity (2) 
The code is logged. 
1143-16
Engine Exhaust Gas Port 7 Temperature : High - moderate severity (2) 
The code is logged. 
1144-16
Engine Exhaust Gas Port 8 Temperature : High - moderate severity (2) 
The code is logged. 
1145-16
Engine Exhaust Gas Port 9 Temperature : High - moderate severity (2) 
The code is logged. 
1146-16
Engine Exhaust Gas Port 10 Temperature : High - moderate severity (2) 
The code is logged. 
1147-16
Engine Exhaust Gas Port 11 Temperature : High - moderate severity (2) 
The code is logged. 
1148-16
Engine Exhaust Gas Port 12 Temperature : High - moderate severity (2) 
The code is logged. 
1149-16
Engine Exhaust Gas Port 13 Temperature : High - moderate severity (2) 
The code is logged. 
1150-16
Engine Exhaust Gas Port 14 Temperature : High - moderate severity (2) 
The code is logged. 
1151-16
Engine Exhaust Gas Port 15 Temperature : High - moderate severity (2) 
The code is logged. 
1152-16
Engine Exhaust Gas Port 16 Temperature : High - moderate severity (2) 
The code is logged. 

Table 4
J1939 Code and Description  Comments 
5686-0
Engine Exhaust Gas Port #1 Difference from Average Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
5687-0
Engine Exhaust Gas Port #2 Difference from Average Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
5688-0
Engine Exhaust Gas Port #3 Difference from Average Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
5689-0
Engine Exhaust Gas Port #4 Difference from Average Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
5690-0
Engine Exhaust Gas Port #5 Difference from Average Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
5691-0
Engine Exhaust Gas Port #6 Difference from Average Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
5692-0
Engine Exhaust Gas Port #7 Difference from Average Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
5693-0
Engine Exhaust Gas Port #8 Difference from Average Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
5694-0
Engine Exhaust Gas Port #9 Difference from Average Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
5695-0
Engine Exhaust Gas Port #10 Difference from Average Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
5696-0
Engine Exhaust Gas Port #11 Difference from Average Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
5697-0
Engine Exhaust Gas Port #12 Difference from Average Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
5698-0
Engine Exhaust Gas Port #13 Difference from Average Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
5699-0
Engine Exhaust Gas Port #14 Difference from Average Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
5700-0
Engine Exhaust Gas Port #15 Difference from Average Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 
5701-0
Engine Exhaust Gas Port #16 Difference from Average Temperature : High - most severe (3) 
The engine is shut down.
The code is logged. 

Table 5
J1939 Code and Description  Comments 
5686-15
Engine Exhaust Gas Port #1 Difference from Average Temperature : High - least severe (1) 
The code is logged. 
5687-15
Engine Exhaust Gas Port #2 Difference from Average Temperature : High - least severe (1) 
The code is logged. 
5688-15
Engine Exhaust Gas Port #3 Difference from Average Temperature : High - least severe (1) 
The code is logged. 
5689-15
Engine Exhaust Gas Port #4 Difference from Average Temperature : High - least severe (1) 
The code is logged. 
5690-15
Engine Exhaust Gas Port #5 Difference from Average Temperature : High - least severe (1) 
The code is logged. 
5691-15
Engine Exhaust Gas Port #6 Difference from Average Temperature : High - least severe (1) 
The code is logged. 
5692-15
Engine Exhaust Gas Port #7 Difference from Average Temperature : High - least severe (1) 
The code is logged. 
5693-15
Engine Exhaust Gas Port #8 Difference from Average Temperature : High - least severe (1) 
The code is logged. 
5694-15
Engine Exhaust Gas Port #9 Difference from Average Temperature : High - least severe (1) 
The code is logged. 
5695-15
Engine Exhaust Gas Port #10 Difference from Average Temperature : High - least severe (1) 
The code is logged. 
5696-15
Engine Exhaust Gas Port #11 Difference from Average Temperature : High - least severe (1) 
The code is logged. 
5697-15
Engine Exhaust Gas Port #12 Difference from Average Temperature : High - least severe (1) 
The code is logged. 
5698-15
Engine Exhaust Gas Port #13 Difference from Average Temperature : High - least severe (1) 
The code is logged. 
5699-15
Engine Exhaust Gas Port #14 Difference from Average Temperature : High - least severe (1) 
The code is logged. 
5700-15
Engine Exhaust Gas Port #15 Difference from Average Temperature : High - least severe (1) 
The code is logged. 
5701-15
Engine Exhaust Gas Port #16 Difference from Average Temperature : High - least severe (1) 
The code is logged. 

Table 6
J1939 Code and Description  Comments 
5686-16
Engine Exhaust Gas Port #1 Difference from Average Temperature : High - moderate severity (2) 
The code is logged. 
5687-16
Engine Exhaust Gas Port #2 Difference from Average Temperature : High - moderate severity (2) 
The code is logged. 
5688-16
Engine Exhaust Gas Port #3 Difference from Average Temperature : High - moderate severity (2) 
The code is logged. 
5689-16
Engine Exhaust Gas Port #4 Difference from Average Temperature : High - moderate severity (2) 
The code is logged. 
5690-16
Engine Exhaust Gas Port #5 Difference from Average Temperature : High - moderate severity (2) 
The code is logged. 
5691-16
Engine Exhaust Gas Port #6 Difference from Average Temperature : High - moderate severity (2) 
The code is logged. 
5692-16
Engine Exhaust Gas Port #7 Difference from Average Temperature : High - moderate severity (2) 
The code is logged. 
5693-16
Engine Exhaust Gas Port #8 Difference from Average Temperature : High - moderate severity (2) 
The code is logged. 
5694-16
Engine Exhaust Gas Port #9 Difference from Average Temperature : High - moderate severity (2) 
The code is logged. 
5695-16
Engine Exhaust Gas Port #10 Difference from Average Temperature : High - moderate severity (2) 
The code is logged. 
5696-16
Engine Exhaust Gas Port #11 Difference from Average Temperature : High - moderate severity (2) 
The code is logged. 
5697-16
Engine Exhaust Gas Port #12 Difference from Average Temperature : High - moderate severity (2) 
The code is logged. 
5698-16
Engine Exhaust Gas Port #13 Difference from Average Temperature : High - moderate severity (2) 
The code is logged. 
5699-16
Engine Exhaust Gas Port #14 Difference from Average Temperature : High - moderate severity (2) 
The code is logged. 
5700-16
Engine Exhaust Gas Port #15 Difference from Average Temperature : High - moderate severity (2) 
The code is logged. 
5701-16
Engine Exhaust Gas Port #16 Difference from Average Temperature : High - moderate severity (2) 
The code is logged. 

Probable Causes

  • Codes

  • Needle valves

  • Intake air temperature

  • Inlet air restriction

  • Engine overload

  • Exhaust restriction

  • Air/Fuel Ratio

  • Valve lash

  • Excessive deposits

Recommended Actions

Table 7
Troubleshooting Test Steps  Values  Results 

1. Check for Codes

A. Connect Cat® Electronic Technician (ET) to the service tool connector.

B. Look for active codes that are associated with the system for the event code.
 

Codes
 

Result: An associated code is active.

Repair: Troubleshoot any associated codes before continuing with this test.

Result: A code is active or logged.

Proceed to Test Step 2.
 

2. Check the Needle Valves Adjustments

Note: If the needle valves are closed, no fuel is supplied to the precombustion chamber. If the needle valves are open too far, the air/fuel mixture will be too rich for combustion.

A. If the needle valves require adjustment, do the following procedure:

- Fully close all of the needle valves.
- Open all of the needle valves 2.5 turns.
- Enter "Engine Prechamber Calibration" mode in Cat ET.
- Record engine average burn time.
- Adjust each needle valve until all cylinders' burn times are within +/- 0.12 milliseconds of the engine average burn time.
- Exit "Engine Prechamber Calibration" mode.

Note: The recommended position of the needle valve is 2.5 turns open.
 

Needle Valves
 

Result: The needle valves are OK.

Proceed to Test Step 3.

Result: The needle valves are NOT OK.

Repair: Adjust the needle valves to the correct setting. Refer to Testing and Adjusting, "BTU and Precombustion Chamber Adjustments" for additional information.

If the problem is not resolved, proceed to Test Step 3.
 

3. Check for High Intake Manifold Air Temperature

Note: A one degree increase in the inlet manifold temperature will increase the exhaust temperature by approximately three degrees.

A. Refer to Troubleshooting, "Intake Manifold Air Temperature Is High" for additional information.
 

Temperature
 

Result: The intake manifold air temperature is OK.

Proceed to Test Step 4.

Result: The intake manifold air temperature is NOT OK.

Repair: Determine the cause of the high intake manifold air temperature and correct the problem.

If the problem is not resolved, proceed to Test Step 4.
 

4. Check for a Restriction in the Inlet Air System

Note: Inlet air restriction can cause uneven exhaust port temperatures. The cylinders at the front half of the engine may have exhaust port temperatures that are lower than the exhaust port temperatures for the cylinders at the rear half of the engine by 10 to 20 °C (18 to 36 °F).

A. Check the air filter restriction indicator, if equipped. Refer to the Operation and Maintenance Manual for additional information.

B. Refer to Troubleshooting, "Inlet Air Is Restricted" for additional information.

Note: High cylinder temperatures can cause a high coolant temperature.
 

Restriction
 

Result: The inlet air restriction is OK.

Proceed to Test Step 5.

Result: The inlet air restriction is NOT OK. An imbalance in the system is discovered.

Repair: Repair or replace damaged inlet air system components. Equalize the inlet air restriction for each of the turbochargers.

If the problem is not resolved, proceed to Test Step 5.
 

5. Check for Engine Overload

Note: When the load that is applied to the engine is too large, the engine will run in the lug condition. When the engine is running in the lug condition, engine rpm does not increase with an increase of fuel.
 

Load
 

Result: The engine is not being overloaded.

Proceed to Test Step 6.

Result: The engine is being overloaded.

Repair: Reduce engine load to an acceptable limit.

If the problem is not resolved, proceed to Test Step 6.
 

6. Check for a Restriction in the Exhaust System

Note: A restriction of the exhaust can cause high cylinder temperatures.

A. Measure the exhaust restriction during engine operation with a load. For data that is specific to your engine, refer to the Technical Marketing Information (TMI).
 

Restriction
 

Result: The exhaust restriction measures OK.

Proceed to Test Step 7.

Result: The exhaust restriction measurement is NOT OK.

Repair: Repair or replace damaged exhaust system components.

If the problem is not resolved, proceed to Test Step 7.
 

7. Check the Air/Fuel Ratio

Note: An air/fuel mixture that is too rich will increase the exhaust temperature. A change in the fuel energy content will change the air/fuel ratio.

Note: If the setting for the fuel's LHV is too low, the air/fuel ratio will be too rich.

A. Obtain a fuel analysis.

Note: If the quality of the gas is inconsistent, obtain several analyses over a period of time.

B. Enter the data into AVSpare Software, LERW4485, "Gas Engine Ratings Pro (GERP)".

C. Verify that the fuel supply pressure is adequate and stable.

D. Verify that the exhaust emissions are correct.
 

Air/Fuel Ratio
 

Result: The air/fuel ratio is OK.

Proceed to Test Step 8.

Result: The air/fuel ratio is NOT OK.

Repair: Use Cat ET to program the results for the "Fuel Specific Heat Ratio", "Fuel Quality", and "Gas Specific Gravity" parameters. Refer to Systems Operation, "Electronic Control System Parameters" for additional information.

Program the "Fuel Quality" parameter to the average value of the LHV. Adjust the engine operation according to Testing and Adjusting, "BTU and Precombustion Chamber Adjustments".

If the problem is not resolved, proceed to Test Step 8.
 

8. Check the Valve Lash

Note: The valve lash can affect the performance of the engine.

A. Make sure that the retainer for the gas admission valve's support assembly is installed.

Note: If the retainer is missing from the gas admission valve's support assembly, the air/fuel mixture will be too rich.
 

Valve Lash
 

Result: The valve lash is OK.

Proceed to Test Step 9.

Result: The valve lash is NOT OK.

Repair: Reset the valve lash. Refer to Testing and Adjusting, "Valve Lash and Valve Bridge Adjustment (Gas Admission Valve Lash)" for additional information.

If the problem is not resolved, proceed to Test Step 9.
 

9. Excessive Deposits in the Combustion Chamber

A. Overfilling of engine oil can lead to deposits. Check the oil level.

B. Use a borescope to inspect the cylinders. Look for the following conditions:

- Deposits on the valve seats
- Deposits on the valve faces
- Deposits on the cylinder walls that are above the upper limit of the piston stroke
- Signs of internal leaks

Note: Signs of internal leaks include excessive consumption of engine oil, blue smoke, and excessive detonation.
 

Deposits
 

Result: Deposits or signs of internal leaks are found.

Repair: Investigate the cause of the condition. Repair or replace damaged components.

Verify that the repair eliminated the problem.
 

If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).

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