SPOOL 3P3467 - Caterpillar

Probable Causes
Exhaust Gas Recirculation (EGR) cooler leak
Cylinder head gasket leak
Cylinder head leakRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.
Table 1
Troubleshooting Test Steps Values Results
1. EGR cooler
A. Check the EGR cooler for leaks for utilizing the "On Engine Test Procedure". Refer to Systems Operation, Testing and Adjusting, "Exhaust Cooler (NRS) - Test".
EGR Cooler
Result : The EGR cooler has a leak.
Repair: Replace the EGR cooler. Refer to the Disassembly and Assembly manual for the correct procedure.
Proceed to Step 5.
Result : The EGR cooler does not have a leak.
Proceed to Test Step 2.
2. Cylinder head gasket leak
A. Check the cylinder head gasket for leaks. Refer to the Systems Operation/Testing and Adjusting for the proper procedure for checking the cylinder head.
Cylinder Head Gasket
Result : The cylinder head gasket is leaking.
Repair: Replace the cylinder head gasket. Refer to the Disassembly and Assembly manual.
Result : The cylinder head gasket is not leaking.
Proceed to Test Step 3.
3. Cylinder head
A. Check for cracks in the cylinder head. Perform a leak test on the cylinder head. Refer to the Systems Operation/Testing and Adjusting for the proper procedure for checking the cylinder head.
Cylinder Head
Result : A crack is found in the cylinder head.
Repair: Repair the cylinder head and/or replace the cylinder head. Refer to the Disassembly and Assembly manual.
Result :There are no cracks in the cylinder head.
Contact the Dealer Solution Network (DSN).