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 for 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. Result : The NRS cooler does not have a leak. Proceed to Test Step 2. |
2. Cylinder head gasket leak A. Check the cylinder head gasket for leaks. |
Cylinder head gasket |
Result : The cylinder head gasket is leaking. Proceed to Test Step 3. Result : The cylinder head gasket is not leaking. 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 the Systems Operation, Testing, and Adjusting, "Cylinder Head - Inspect" for the correct procedure. |
Cylinder head |
Result : A crack is found in the cylinder head. Repair: Repair the cylinder head or replace the cylinder head. Refer to the Disassembly and Assembly manual. Proceed to Test Step 4. Result : The cylinder head is OK. Proceed to Test Step 4. |
4. Cylinder Block A. Check for cracks in top face of the cylinder block. Refer to the Systems Operation, Testing, and Adjusting, "Cylinder Block - Inspect" for the correct procedure. |
Cylinder head |
Result : A crack is found in the cylinder block. Repair: Repair the cylinder block or replace the cylinder block. Refer to the Disassembly and Assembly manual. Repair: Assemble the cylinder head with a new cylinder head gasket. Refer to the Disassembly and Assembly manual. Result : The cylinder block is OK. Repair: Assemble the cylinder head with a new cylinder head gasket. Refer to the Disassembly and Assembly manual. |
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