Selective Catalytic Reduction (SCR) Catalyst - Removal

REMOVAL - SELECTIVE CATALYTIC REDUCTION (SCR) CATALYST

WARNING: If torches are used when servicing the exhaust system, do not allow any flame near the fuel lines or the fuel tank. Failure to follow these instructions may result in possible serious or fatal injury.

1. Disconnect both negative battery cables.
2. Raise vehicle.
3. If equipped, remove skid plates.
4. Disconnect the temperature and NOx sensors.
5. Saturate bolts and nuts with heat valve lubricant. Allow 5 minutes for penetration.





NOTE: Do not remove the cooling lines (2) or the Urea supply line (1) to the Diesel Exhaust Fluid injector unless replacing the injector.






6. Remove the DEF injector (3) from the SCR catalyst (1) and position aside.
7. Remove the tailpipe assembly Exhaust Tailpipe - Removal.





8. Remove the isolators (1).
9. Remove the flange nuts (3).
10. Remove the SCR (2).
11. Remove and discard flange gaskets.