Removing and installing catalytic converter - AR49.10-P-5500MLJ

ENGINE 157, 278 in MODEL 166 

Engine 157, 278 in model 292 

Fig 1: Identifying Catalytic Converter Remove/Install Components

Courtesy of MERCEDES-BENZ USA

Courtesy of MERCEDES-BENZ USA	Risk of injury  . Skin or eye injuries may result when handling hot or glowing objects.	Wear protective gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
Courtesy of MERCEDES-BENZ USA	Risk of injury  caused by scraping or cutting body parts on sharp vehicle parts	Always wear protective gloves when working on or near sharp and non-deburred vehicle parts. Deburr repair panels.	AS00.00-Z-0017-01A
Courtesy of MERCEDES-BENZ USA	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
Courtesy of MERCEDES-BENZ USA	Notes on self-locking nuts and bolts		AH00.00-N-0001-01A
Courtesy of MERCEDES-BENZ USAMERCEDES-BENZ USA Courtesy of MERCEDES-BENZ USAMERCEDES-BENZ USA	Remove/install
1	Remove rear underfloor paneling	Courtesy of MERCEDES-BENZ USA Installation  : Only install underfloor paneling after the engine test run and leak test.	AR61.30-P-1001GQ
2	Disconnect electrical connection of the respective oxygen sensor (1, 2, 3, 4) and expose lines		AR07.04-P-0021MLJ
3	Remove rear engine crossmember	Engine 157 in model 166 Engine 278 in model 166	AR22.10-P-1180GQ
4	Secure center exhaust system (9) against falling down
5	Detach decoupling elements (13) from the center exhaust system (9)
6	Unfasten clamps (7, 8) of left catalytic converter (6) or right catalytic converter (5)	Courtesy of MERCEDES-BENZ USA Engine 157, 278 in model 166 Engine 157, 278 in model 292 Bolt, exhaust system clamp to catalytic converter	*BA49.10-P-1012-01AK
7	Lower center exhaust system (9) until the left catalytic converter (6) and right catalytic converter (5) are free	Courtesy of MERCEDES-BENZ USA Removal  : Ensure that the end pieces of the rear muffler (12) do not touch the bumper.
8	Remove left (6) or right CAT (5)	Courtesy of MERCEDES-BENZ USA Engine 157, 278 in model 166 Engine 157, 278 in model 292 Bolt, catalytic converter flange to exhaust line	*BA49.10-P-1015-01AK
Courtesy of MERCEDES-BENZ USA	Clean
9	Remove combustion and corrosion residue at separating points
Courtesy of MERCEDES-BENZ USA	Check
10	Check decoupling elements (13)	Courtesy of MERCEDES-BENZ USA Check for wear and damage, and replace if necessary.
11	Install in the reverse order
Courtesy of MERCEDES-BENZ USA	Check
12	Check installation position and unobstructed movement of all components of the exhaust system
Courtesy of MERCEDES-BENZ USA	Risk of accident  from vehicle starting off by itself when engine running. Risk of injury  (bruises and burns) resulting from working on the engine while it is being started or when it is running.	Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
13	Perform an engine test run and check exhaust system for leak tightness

Exhaust system - Torque Specifications