GEAR AS-MAGNETO DRIVE 4W6704 - Caterpillar

Probable Causes
Oil cooler
Jacket water pump and auxiliary water pump (if equipped)
Water-cooled turbocharger (if equipped)
Air compressor (if equipped)
Cylinder head gasket
Cylinder head
Cylinder blockRecommended Actions
Table 1
Troubleshooting Test Steps Values Results
1. Check for leaks in the Engine Oil Cooler
A. Refer to the Testing and Adjusting manual for additional information.
Oil Cooler
Result: A leak was not found in the engine oil cooler.
Proceed to Test Step 2.
Result: A leak is found in the engine oil cooler.
Repair: Perform the following procedure:
1. Install a new oil cooler core. Refer to the Disassembly and Assembly manual for additional information.
2. Check the oil for coolant. If coolant is found in the oil, drain the crankcase.
3. Refill the crankcase with the proper oil after the leak has been repaired. Refer to the Operation and Maintenance Manual for the correct oil capacities and viscosity.
If the problem is not resolved, proceed to Test Step 2.
2. Check the Jacket Water Pump and the Auxiliary Water Pump
A. Check the weep hole of the jacket water pump for plugging. A plugged weep hole may cause coolant to be forced past the pump shaft seals into the crankcase.
B. Thoroughly inspect the water pump for damage and cracks. If internal leakage is suspected, remove the pump from the engine to perform a thorough inspection.
Pump
Result: The weep hole was not plugged and the pump is not damaged.
Proceed to Test Step 3.
Result: The weep hole was plugged.
Repair: Clear the plug.
If the problem is not resolved, proceed to Test Step 3.
Result: There was a problem with the water pump.
Repair: Perform the following procedure:
1. Install a new water pump. Refer to the Disassembly and Assembly manual for additional information.
2. Check the oil for coolant. If coolant is found in the oil, drain the crankcase.
3. Refill the crankcase with the proper oil after the leak has been repaired. Refer to the Operation and Maintenance Manual for the correct oil capacities and viscosity.
If the problem is not resolved, proceed to Test Step 3.
3. Inspect the Water-Cooled Turbocharger
A. Remove the oil drain line from the turbocharger and pressurize the cooling system. Refer to Testing and Adjusting, "Testing the Cooling System" for additional information.
B. Check the turbocharger for coolant leakage.
Turbocharger
Result: The turbocharger is not cracked.
Proceed to Test Step 4.
Result: The turbocharger is cracked.
Repair: Perform the following procedure:
1. Replace the turbocharger. Refer to the Disassembly and Assembly for additional information.
2. Check the oil for coolant. If coolant is found in the oil, drain the oil.
3. Refill the oil after the leak has been repaired. Refer to the Operation and Maintenance Manual for the correct oil capacities and viscosity.
If the problem is not resolved, proceed to Test Step 4.
4. Check the Air Compressor
A. Thoroughly inspect the air compressor for damage and cracks. For information on the air compressor, refer to the Original Equipment Manufacturers (OEM) service information.
Air Compressor
Result: The air compressor does not leak.
Proceed to Test Step 5.
Result: The air compressor does leak.
Repair: Clear the plug.
If the problem is not resolved, proceed to Test Step 5.
Result: The air compressor is damaged.
Repair: Perform the following procedure:
1. Install a