Altima 2.5 SL L4-2.5L (QR25DE) (2002)
9. Use compressed air to remove any metal debris from inside the boss threads.
CAUTION:
DO NOT perform this step if the procedure is being done on the vehicle (Method #1). Doing so may cause metal debris to enter the engine cylinders.
10. If metal debris remains trapped in the boss threads, use a spiral nylon brush to remove it.
11. Spray the boss threads with rust penetrant for 2 to 3 seconds.
12. Run a thread chaser through the boss to clean the threads.
^ Use Kent Moore part number J-43897-18 or J43897-12.