Replace timing chain - AR05.10-P-7601ELS

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ENGINE 276.8 in MODEL 212, 218

MODIFICATION NOTES

14.3.14

Work procedure adapted to changed repair method and INA timing chain, added

Shown on engine 276.952 with IWIS timing chain

Fig 1: Timing Chain Components

Courtesy of MERCEDES-BENZ USA

	Risk of injury caused by fingers being jammed or pinched when removing, installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof.	No parts of the body or limbs should be within the operating area when the components are moving.	AS00.00-Z-0011-01A
	Remove
1	Detach ground line from battery		AR54.10-P-0003EW
	Notes on battery		AH54.10-P-0001-01A
2	Remove camshafts with camshaft adjusters	The camshaft positioners remain on the camshafts.	AR05.20-P-6992EL
3	Determine variant of timing chain	There are two variants of the chain drive which can be differentiated between by means of optical checking. For modification of the chain drive all parts engaging with the timing chain must be replaced.	AR05.10-P-7601-05MM
4.1	Disconnect old IWIS timing chain (1)	Engine with IWIS timing chain	AR05.10-P-7601-01MM
		Pressure screw	Figure
		Chain separating tool	Figure
		Case	Figure
		For a timing chain stretch, replace both secondary chains and the primary chain drive timing chain: ↓ Replace primary chain drive timing chain	AR05.10-P-7612EL
4.2	Disconnect INA timing chain	Engine with INA timing chain
			AR05.10-P-7601-01MMA
		Rivet press tool For a timing chain stretch, replace both secondary chains and the primary chain drive timing chain: ↓ Replace primary chain drive timing chain	Figure
			AR05.10-P-7612EL
	Install
5	Draw in new timing chain using an assembly link (04)		AR05.10-P-7601-04MM
		Assembly element	Figure
		Case	Figure
6.1	Rivet new IWIS timing chain (2) Engine with IWIS timing chain		AR05.10-P-7601-02MM
		Assembly insert	Figure
		Riveting tool	Figure
		Case	Figure
6.2	Rivet new INA timing chain	Engine with INA timing chain	AR05.10-P-7601-02MMA
		Rivet press tool	Figure
7	Install camshafts with camshaft adjusters	Only install cylinder head covers after checking the basic position of the camshafts.	AR05.20-P-6992EL
8	Check basic position of the camshafts using the installed chain tensioners and correct if necessary		AR05.20-P-6020EL
9	Connect ground line to battery		AR54.10-P-0003EW
	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
10	Carry out an engine test run, checking the engine for proper operation and leaktightness