SHAFT ASSEM. 7D1844 - Caterpillar

Note: Some white smoke may be present during cold start-up conditions when the engine is operating normally. If the white smoke persists, there may be a problem.Note: Refer to Troubleshooting, "Cat ET Service Features" for information about service features.Probable Causes
Active codes
Oil in the exhaust system
Cold mode operation (if applicable). Refer to "Cold Mode Operation" within the Systems Operation, "General Information".
Starting aids (if applicable)
Noncurrent flash file
Cooling system
Unstable fuel supply
Unstable fuel injectionRecommended Actions
Complete the procedure in the order in which the steps are listed.
Table 1
Troubleshooting Test Steps Values Results
1. Active Codes and Logged Codes
A. Establish communication between Cat® Electronic Technician (ET) and the Electronic Control Module (ECM) . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Determine if a code is active or logged.
Diagnostic Code
Result: A code is active or logged.
Repair: Troubleshoot any active codes before continuing with this procedure.
Result: A code is not active or logged.
Proceed to Test Step 2.
2. Oil in the Exhaust System
A. Check for oil in the exhaust system.
Oil in the Exhaust System
Result: The exhaust system contains oil.
Repair: Determine the cause of oil in the exhaust system and make the necessary repairs.
Proceed to Test Step 3.
Result: The exhaust system does not contain oil.
Proceed to Test Step 5.
3. Clean Oil from the Exhaust System
A. Remove excess oil from piping with a clean cloth.
B. Inhibit regeneration with the inhibit switch.
C. Operate the engine at elevated idle (1500 RPM) for 10 minutes.
Oil in the Exhaust System
Result: Oil has been cleaned from the exhaust system and the white smoke has dissipated.
Return the unit to service.
Result: Oil has been cleaned from the exhaust system but the white smoke did not dissipate.
Proceed to Test Step 4.
4. Clean Oil from the Aftertreatment System
A. Shut off the engine
B. Remove the DPF center section, let the DPF drain on the inlet side overnight.
C. Remove the DOC, let the DOC drain on the outlet side overnight
D. Once drained, install the DPF and DOC
E. Operate the engine at elevated idle (1500 RPM) for 10 minutes.
Oil in the Aftertreatment System
Result: Oil has been cleaned from the aftertreatment system and the white smoke has dissipated.
Return the unit to service.
Result: Oil has been cleaned from the aftertreatment system but the white smoke did not dissipate.
Contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).
5. Cold Mode Operation (if applicable)
During cold mode operation, condensation may be present and is normal.
A. Cold mode is activated whenever the engine coolant temperature falls below a predetermined value. Monitor the status screen on Cat ET in order to verify that the engine has exited cold mode. Observe the reading for coolant temperature on the Cat ET.
Cold Mode
Result: The engine is operating in cold mode.
This is normal operation. Return the engine to service.
Result: The engine is not operating in cold mode.
Proceed to Test Step 6.
6. Starting Aids (If Applicable)
A. If cold ambient conditions exist, check operation of starting aids. Verify that the starting aid is operating correctly. Refer to the appropriate circuit test for information that