HOSE AS 3258855 - Caterpillar

Probable Causes
Leaks in the core of oil cooler
Leaks in the core of the NRS cooler
Cracks in the turbocharger housing or center section
Leaks in the cylinder head gasket
Damaged water seals
Cracks in the cylinder head
Cracks in a cylinder liner
Liner seals
Cracks in the cylinder blockRecommended Actions
Table 1
Troubleshooting Test Steps    Values    Results    
1. Leaks in the Cooling System
A. Pressurize the cooling system. Refer to Systems Operation/Testing and Adjusting, "Cooling System - Test".
   
Leaks
   
Result: The test indicates a drop in pressure.
If there are no external leaks, there may be an internal leak.
Repair: Make any repairs, as required.
Result: The test indicates that there is not a drop in pressure.
Proceed to Test Step 2.
   
2. Leaks in Core of Oil Cooler
A. Check for leaks in the oil cooler core.
   
Oil Cooler
   
Result: The oil cooler is leaking.
Repair: Repair or replace the oil cooler.
Result: The oil cooler is not leaking.
Proceed to Test Step 3.
   
3. Exhaust (NRS) Cooler
A. Check the NRS cooler for leaks. Refer to Testing and Adjusting, "Exhaust Cooler (NRS) - Test".
   
NRS Cooler
   
Result: The exhaust (NRS) cooler is leaking.
Repair: Repair or replace the exhaust (NRS) cooler.
Result: The exhaust (NRS) cooler is not leaking.
Proceed to Test Step 4.
   
4. Liquid Cooled Turbochargers
A. Inspect the turbocharger housing and center section for cracks.
   
Turbocharger
   
Result The turbocharger housing or center section has cracks.
Repair: Make any repairs, as required.
Result The turbocharger housing or center section does not have cracks.
Proceed to Test Step 5.
   
5. Leaks in the Cylinder Head Gasket
A. Inspect the cylinder head gasket for leaks.
   
Head Gasket
   
Result The cylinder head gasket is leaking.
Repair: Replace the cylinder head gasket.
Result The cylinder head gasket is not leaking.
Proceed to Test Step 6.
   
6. Damaged Water Seals
A. Inspect the water seal for damage.
   
Water Seals
   
Result The water seal is damaged.
Repair: Repair or replace the damaged seal.
Result The water seal is not damaged.
Proceed to Test Step 7.
   
7. Cracks in the Cylinder Head
A. Check for cracks in the cylinder head.
   
Cylinder Head
   
Result The cylinder head is damaged.
Repair: Repair or replace the damaged cylinder head.
Result The cylinder head is not damaged.
Proceed to Test Step 8.
   
8. Cracks in a Cylinder Liner
A. Check for cracked cylinder liners.
B. Check the liner seals for damage.
   
Cylinder Liner and Seals
   
Result The cylinder liner or seal is damaged or cracked.
Repair: Repair or replace the damaged cylinder liner and seal.
Result The cylinder liner or seal is not damaged or cracked.
Proceed to Test Step 9.
   
9. Cracks in the Cylinder Block
A. Inspect the cylinder block for cracks.
   
Cylinder Liner
   
Result The cylinder block is cracked.
Repair: Repair or replace the damaged cylinder block.
   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).