C9.3 Marine Auxiliary and Generator Set Engine Caterpillar

Exhaust Has Excessive Black Smoke

Usage:

C9.3 C93

Check for the following problems if there is excessive black exhaust smoke.

Note: Refer to Troubleshooting, "Cat ET Service Features" for information about service features.

Recommended Actions

Complete the procedure in the order in which the steps are listed.

Show/hide table

Table 1
Troubleshooting Test Steps	Values	Results
1. Diagnostic Codes A. Check for any logged or active codes associated with high soot loading.	Codes	Result: There are no codes present. Proceed to Test Step 2. Result: There are codes present. Repair: Troubleshoot the codes before continuing with this procedure. If the problem is not resolved, proceed to Test Step 2.
2. Perform the Automatic Cylinder Cutout Test using Cat ET.	Cylinder Cutout Test	Result: The test was successful. Proceed to Test Step 3. Result: The test was not successful. Repair: Diagnose the problem. Repair or replace damaged components. If the problem is not resolved, proceed to Test Step 3.
3. Check for Boost Pressure Leaks	Leaks	Result: There are no leaks found. Proceed to Test Step 4. Result: There are leaks found. Repair: Diagnose and repair the boost pressure leaks. If the problem is not resolved, proceed to Test Step 4.
4. Inspect the Turbocharger A. Check for boost pressure leaks. Refer to Testing and Adjusting, "Turbocharger - Inspect" for additional information.	Turbocharger	Result: The turbocharger is not OK. Repair: Replace the turbocharger. 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).