HOUSING-WATER PUMP 3499369 - Caterpillar

Probable Causes
Active codes and logged codes
Low-quality fuel
Injectors
Lack of lubrication
Valve train components
Gear train and components of the lower endRecommended Actions
Table 1
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Establish communication between Cat® Electronic Technician (ET) and the Electronic Control Module (ECM).
B. Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing codes.
Codes
Result: A code is not active or logged.
Proceed to Test Step 2.
Result: A code is active or logged.
Repair: Troubleshoot the codes.
2. Check for Low-Quality Fuel
A. Refer to Operation and Maintenance Manual for information on the proper characteristics of the fuel for the engine. If necessary, obtain a fuel analysis to confirm that the correct fuel is being used for the engine. Refer to Systems Operation/Testing and Adjusting, "Fuel System Quality Test" for the proper procedure.
Fuel
Result: The fuel quality is OK.
Proceed to Test Step 3.
Result: The fuel quality is not OK.
Repair: Replace the fuel. Verify that the repair eliminated the problem.
3. Injectors
A. Perform the "Fuel Rail Pressure Test" in the "Diagnostic Tests" under the "Diagnostics" menu.
"Fuel Rail Pressure Test"
Result: The test was successful.
Proceed to Test Step 4.
Result: The test was not successful.
Repair: Diagnose the problem and then repair the problem. Reset all active codes and clear all logged codes. Verify that the repair eliminated the problem.
4. Lack of Lubrication
A. Check for proper lubrication of the valve components. Check for sufficient lubrication between the injector tappets and the rocker arms.
B. Check for blocked oil passages. Oil passages must be clean. Clean any oil passages that are questionable. Refer to the Disassembly and Assembly for additional information.
Lubrication
Result: The oil passages are not blocked and the engine has proper lubrication.
Proceed to Test Step 5.
Result: The oil passages are blocked or the engine does not have proper lubrication.
Repair: Make the necessary repairs, Verify that the repair eliminated the problem.
5. Valve Train Components
A. Check the valve lash. Refer to Troubleshooting, "Valve Lash Is Excessive".
B. Check for damage to valve train components. Remove the valve cover from the suspect cylinders. Check the following items for damage:
- Camshaft
- Valve rotocoil
- Valve springs
- Camshaft followers
- Rocker shaft
- Bridges
- Pushrods
- Injectors
C. Check for valves that do not move freely. Remove the cylinder head and inspect the valves.
Note: Refer to the Disassembly and Assembly for additional information.
Valve train
Result: The valve train components are not damaged.
Proceed to Test Step 6.
Result: The valve train components are damaged.
Repair: Make the necessary repairs. Verify that the repair eliminated the problem.
6. Gear Train and Components of the Lower End
A. Inspect the gear train and lower end components.
Gear Train
Result: The gear train or lower end components are damaged.
Repair: Replace any damaged parts.
If this procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solution Network (DSN).