GM/Detroit 6.5L EXHAUST SYSTEM – CLOSE-COUPLE CATALYTIC CONVERTER REPLACEMENT

Remove or Disconnect (Figures 2, 12 and 16)
• Raise the vehicle.
• Support intermediate exhaust pipe.

1. Oxygen sensor electrical connection (if equipped).
2. Nuts, springs, and flange gasket from exhaust manifold pipe.
3. Nuts and washers from rear exhaust pipe flange to intermediate pipe flange.
4. Catalytic converter assembly.

Install or Connect
• Position catalytic converter to intermediate pipe.
1. Washers and nuts onto rear exhaust pipe flange studs.

Tighten
• Nuts to 43 N-m (32 Ibs. ft.)
2. Flange gasket, springs, and nuts to exhaust mani­fold.
• Nuts to 29 N-m (22 Ibs. ft.).
3. Oxygen sensor electrical connection (if equipped).
• Check for clearance and alignment.
• Remove support from intermediate exhaust pipe.
• Lower the vehicle.

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