Exhaust System Contains Coolant
Use the following procedure to troubleshoot a problem with coolant in the exhaust system.
- NOx Reduction System (NRS) cooler
- Cylinder head gasket
- Cylinder head
- Cylinder block
Note: The procedures have been listed in order of probability. Complete the procedures in order.
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| Troubleshooting Test Steps | Values | Results |
|---|---|---|
1. NRS cooler A. Check the NRS cooler for leaks by utilizing the "On Engine Test Procedure". Refer to Systems Operation, Testing, and Adjusting, "Exhaust Cooler (NRS) - Test". |
NRS cooler |
Result : The NRS cooler has a leak. Repair: Replace the NRS cooler. Refer to the Disassembly and Assembly manual for the correct procedure. Proceed to Step 5. Result : The NRS cooler does not have a leak. Proceed to Test Step 2. |
2. Cylinder Head Gasket A. Remove the cylinder head. Refer to Disassembly and Assembly, "Cylinder Head - Remove". B. Inspect the cylinder head gasket for faults and any signs of leakage. |
Cylinder head gasket |
Result: The cylinder head gasket does not show signs of damage or leakage. Repair: Install a new cylinder head gasket and install the cylinder head. Refer to Disassembly and Assembly, "Cylinder Head - Install" . Result: The cylinder head gasket shows signs of damage or leakage. Proceed to Test Step 3. |
3. Cylinder Head A. Check for cracks in the cylinder head. Perform a leak test on the cylinder head. Refer to System Operation, Testing and Adjusting, "Cylinder Head - Inspect" for the correct procedure. |
Cylinder head |
Result: A fault was found in the cylinder head. Repair: Repair the cylinder head or replace the cylinder head. Install the cylinder head. Refer to Disassembly and Assembly, "Cylinder Head - Install". Result: A fault was not found in the cylinder head. Proceed to Test Step 4. |
4. Cylinder Block A. Inspect the top face of the cylinder block for faults and signs of leakage. Refer to Systems Operation, Testing, and Adjusting, "Cylinder Block - Inspect" for the correct procedure. |
Cylinder block |
Result: A fault was found in the cylinder block. Repair: Repair the cylinder block or replace the cylinder block. Inspect the top deck. Refer to the Reuse and Salvage Guidelines for the proper inspection procedure. Result: No fault was found in the cylinder block. Install the cylinder head. Refer to Disassembly and Assembly, "Cylinder Head - Install". Contact the Dealer Solutions Network (DSN). |
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