PLUG 3E4046 - Caterpillar

Probable Causes
Lubrication
Valve train components
Precombustion chamber bolts
Gear trainRecommended Actions
Table 1
Troubleshooting Test Steps Values Results
1. Check for Proper 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. Refer to the Disassembly and Assembly manual for additional information.
C. Inspect the engine oil filters for ferrous material.
D. Obtain an S O S oil analysis. The analysis will contribute to a better understanding of oil contamination and the origin of the contamination.
Lubrication
Result: The oil passages are not blocked and the engine has proper lubrication.
Proceed to Test Step 2.
Result: The oil passages are blocked or the engine does not have proper lubrication.
Repair: Clean oil passages. Repair or replace damaged components.
If the problem is not resolved, proceed to Test Step 2.
2. Inspect the Valve Train Components
A. Remove the valve mechanism cover and the camshaft covers.
B. Check the valve lash. Refer to Testing and Adjusting, "Valve Lash and Valve Bridge Adjustment (Gas Admission Valve Lash)" for additional information.
C. Check the following valve train components for damage:
- Camshaft
- Valve rotocoil
- Valve springs
- Camshaft followers
- Rocker shaft
- Bridges
- Pushrods
D. Check for valves that do not move freely. Remove the cylinder head and inspect the valves. Refer to the Disassembly and Assembly manual for additional information.
Valve Train
Result: The valve train components are not damaged.
Proceed to Test Step 3.
Result: The valve train components are damaged.
Repair: Repair or replace damaged valve train components.
If the problem is not resolved, proceed to Test Step 3.
3. Inspect the Precombustion Chamber Bolts
A. Make sure that the bolts are not loose or broken.
Bolts
Result: The precombustion chamber bolts are OK.
Proceed to Test Step 4.
Result: The precombustion chamber bolts are NOT OK.
Repair: Replace any damaged precombustion chamber bolts.
If the problem is not resolved, proceed to Test Step 4.
4. Inspect the Gear Train
A. Check the following gear train for damage:
- Crankshaft gear
- Camshaft drive gear
B. Verify that the crankshaft and the camshaft drive gears are set with the proper orientation for engine timing.
Gear Train
Result: The gear train has excessive wear.
Repair: Repair or replace damaged gear train components. Refer to the Disassembly and Assembly manual and the Reuse and Salvage Guidelines manual for additional information.
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).