BLOCK-SHEAR 3566435 - Caterpillar

Probable Causes
Incorrect maintenance intervals and/or incorrect oil
Contaminated engine oil
Low oil pressure
Leaks in air intake system
Dirt in fuelRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.
Table 1
Troubleshooting Test Steps    Values    Results    
1. Incorrect Maintenance Intervals and/or Incorrect Oil
A. Use engine oil that is recommended and change the engine oil at the interval that is recommended by the engines Operation and Maintenance Manual.
   
Maintenance intervals
   
Result: The engine oil was not changed at the interval that is recommended by the Operation and Maintenance Manual.
Use the recommended grade of oil.
Change the engine oil at the interval that is recommended. Repair or replace any damaged parts.
Result: The engine oil was changed at the interval that is recommended by the engines Operation and Maintenance Manual.
Proceed to Test Step 2.
   
2. Contaminated Engine Oil
A. Obtain an S-O-S oil analysis. The analysis will identify oil contamination.
B. Check the oil filter bypass valve.
Note: If the oil filter bypass valve is open, the oil will not be filtered.
   
Contamination
   
Result: The oil is contaminated.
Determine the reason for any contamination of the engine oil and make the necessary repairs. Drain the crankcase and refill the crankcase with clean engine oil. Install new engine oil filters. Refer to the engines Operation and Maintenance Manual.
Result: The oil filter bypass valve is open.
Replace the oil filter element. Refer to the Operation and Maintenance Manual.
Check the oil filter bypass valve for a weak spring or for a broken spring. If the spring is broken, replace the spring. Verify that the oil bypass valve is operating correctly.
Result: The oil is not contaminated.
Proceed to Test Step 3.
   
3. Low Oil Pressure
Note: Engine oil that is contaminated with another liquid can cause low engine oil pressure. High engine oil level can be an indication of contamination.
A. Obtain an analysis of the engine oil.
B. Check the inlet screen on the suction tube and remove any material that may be restricting engine oil flow.
Note: The inlet screen of the suction tube for the engine oil pump can have a restriction. This restriction will cause cavitation and a loss of engine oil pressure.
When some components of the engine show wear in a short time, the cause can be a restriction in a passage for engine oil. An indicator for the engine oil pressure may indicate sufficient pressure, but a component is worn due to a lack of lubrication. In such a case, look at the passage for the engine oil supply to the component. Refer to Systems Operation/Testing and Adjusting, "Lubrication System" for additional information.
   
Oil pressure
   
Result: Analysis indicates that the oil is contaminated.
Replace the oil and the oil filter. Refer to the Operation and Maintenance Manual.
Result: The inlet tube has a restriction.
Clear the obstruction. Verify the repair.
Result: The oil pressure is low.
Refer to Troubleshooting, "Oil Pressure Is Low" for the testing procedure. Repair any identified faults..
Result: The oil pressure is normal.
Proceed to Test Step 4.
   
4. Leaks in Air Intake System
Note: A leak in the air