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

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ENGINE 157, 276.9, 278 in MODEL 212, 218

MODIFICATION NOTES

14.3.14

Adapted to the altered repair method and INA timing chain; added

Shown on engine 276 with IWIS timing chain

Fig 1: Timing Chain Components

Courtesy of MERCEDES-BENZ USA

	Risk of injury . Moving parts can pinch, crush or, in extreme cases even sever extremities.	No parts of the body or limbs should be within the operating range of the mechanism when moving components.	AS00.00-Z-0009-01A
	Remove
1	Detach ground line from battery		AR54.10-P-0003EW
	Notes on battery		AH54.10-P-0001-01A
2	Remove camshafts with camshaft positioners	The camshaft positioners remain on the camshafts.	AR05.20-P-6992EL
3	Determine variant of timing chain	There are two different variants of the chain drive which one can differentiate between simply 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 timing chain (1) Engines 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 ENGINE 157, 278	AR05.10-P-7612ELB
		ENGINE 276.9	AR05.10-P-7612EL
4.2	Disconnect old timing chain (1) Engines with INA timing chain		AR05.10-P-7601-01MMA Figure
		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 ENGINE 157, 278	AR05.10-P-7612ELB
		ENGINE 276.9	AR05.10-P-7612EL
	Install
5	Draw in new timing chain (2) using an assembly link (04)		AR05.10-P-7601-04MM
		Assembly element	Figure
		Case	Figure
6.1	Rivet new timing chain (2)	Engines with IWIS timing chain	AR05.10-P-7601-02MM
		Assembly insert	Figure
		Riveting tool	Figure
		Case	Figure
6.2	Rivet new timing chain (2)	Engines with INA timing chain	AR05.10-P-7601-02MMA
		Rivet press tool	Figure
7	Install camshafts with camshaft positioners	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 tensioner and correct if necessary		AR05.20-P-6020EL
9	Connect ground line to battery		AR54.10-P-0003EW
	Notes on battery		AH54.10-P-0001-01A
	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