Remove/install catalytic converter - AR49.10-P-5500MCU

ENGINES 132.910 in MODEL 451.3/4 with CODE (494) USA version 

ENGINES 132.910 in MODEL 451.3/4 as of 31.8.10 except CODE (494) USA version 

Fig 1: Identifying Catalytic Converter Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of injury  to skin and eyes caused by handling hot or glowing objects.	Wear safety gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
1	Remove rear muffler	* for USA only Engine 132.910	AR49.10-P-4823MCU
		* not for USA Engine 132.910 as of 31.8.10	AR49.10-P-4823MCF
2	Unclip bracket (7) from connector on O2 sensor upstream of CAT [KAT] (G3/2x1)
3	Disconnect connector for O2 sensor upstream of CAT [KAT] (G3/2x1) and connector for O2 sensor downstream of CAT [KAT] (G3/1x1)
4	Support rear axle crossmember (1) using a transmission jack, unscrew bolts (arrows) and lower the rear axle crossmember (1)	Use a suitable base. Transmission jack	*BA35.10-P-1003-01F
5	Unscrew bolts (8) and remove heat shield (5)
6	Unscrew bolts (3) from bracket (4)
7	Unscrew bolt (9) from bracket (10)		*BA49.10-P-1003-01AD
8	Unscrew nuts (6) and remove three-way catalytic converter (2)	Replace self-locking nuts (6). : Clean sealing surfaces on cylinder head, on catalytic converter (2). Replace exhaust manifold gasket.	*BA49.10-P-1002-01AD
9	Remove heat shield (5)	When replacing catalytic converter (2).	AR49.10-P-6905MCU
10	Remove O2 sensor upstream of CAT [KAT] and O2 sensor downstream of CAT [KAT] from catalytic converter (2)	When replacing catalytic converter (2). Use a suitable 22 mm socket wrench. : Coat thread on O2 sensor downstream of CAT [KAT] and O2 sensor upstream of CAT [KAT] with paste.	*BA14.00-P-1002-01B
			*BA14.00-P-1003-01B
		Paste	*BR00.45-Z-1005-06A
11	Unscrew nuts (11) and remove bracket (10)	When replacing catalytic converter (2). The holder (10) is attached using two nuts (11).	*BA49.10-P-1004-01AD
12	Install in the reverse order
	Risk of accident  caused by vehicle starting off by itself when engine is running. Risk of injury  caused by contusions and burns during starting procedure or when working near the engine as it is running	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
13	Perform engine test run and inspect exhaust system around catalytic convertor (2) for leaks