Remove/install chain tensioner - AR05.10-P-7800ELB

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ENGINE 157, 278 in MODEL 212, 218

ENGINE 278 in MODEL 207

MODIFICATION NOTES

25.3.14

Adapted to new repair method

Shown on right chain tensioner

Fig 1: Chain Tensioner Remove/Install 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/install
1.1	Rotate engine at crankshaft center bolt in direction of engine rotation to a 40° crank angle (CA) after top dead center (TDC) on cylinder 1 (ignition TDC)	To remove the left chain tensioner (1)	AR05.10-P-7620-04MM
1.2	Rotate engine at crankshaft center bolt in direction of engine rotation to a 40° crank angle after top dead center (overlap TDC) on cylinder 1 (overlap TDC)	To remove the right chain tensioner (1)	AR05.10-P-7620-04MM
2	Remove respective front cover on the cylinder head	Right cover	AR01.30-P-5700ELB
		Left cover	AR01.30-P-5700ELA
3	Remove oil filter element	ENGINE 278 in MODEL 207, 212, 218 without CODE 139 (M157/M278 engine cooling measures) To remove the left chain tensioner (1)
			AP18.00-P-0101-06TMG
		Mount, oil filter housing cover	*BA18.20-P-1001-01Y
		Wrench socket	Figure
4	Remove screw/bolts (3) from chain tensioner (1)	Screw/bolt, chain tensioner to cylinder crankcase/cylinder head	*BA05.10-P-1001-01R
5	Remove chain tensioner (1)	After installation of the chain tensioner (1) the chain tensioner (1) is activated after pulling the securing drift. The chain tensioner (1) moves out and tensions the timing chain. The chain tensioner (1) should be replaced by a new part if this is not the case.
	Check
6	Check chain tensioner (1) and replace if necessary	The chain tensioner (1) may only now be reset and reused if it did not have any noticeable problems during previous operation and all components of the chain drive do not show any signs of damage or no components of the chain drive were replaced. The chain tensioner (1) is pretensioned by an internal spring and moves out autonomously when being removed. If the chain tensioner (1) should not move out completely automatically then it must be replaced by a new chain tensioner (1).
7	Reset chain tensioner (1)	When reusing the chain tensioner (1)	AR05.10-P-7800-03MM
		Chain tensioner for left engine side basic dimension/extended dimension	*BE05.10-P-1001-02A
		Chain tensioner for right engine side basic dimension/extended dimension	*BE05.10-P-1002-02A
8	Install in the reverse order
	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
9	Carry out an engine test run and check engine for leaktightness

BASIC DIMENSION/EXTENDED DIMENSION

Number	Designation		ENGINE 152, 157, 278
BE05.10-P-1001-02A	Chain tensioner for left engine side basic dimension/extended dimension	mm	74, 7

BASIC DIMENSION/EXTENDED DIMENSION

Number	Designation		ENGINE 152, 157, 278
BE05.10-P-1002-02A	Chain tensioner for right engine side basic dimension/extended dimension	mm	78, 7

TIMING CHAIN, CHAIN TENSIONER

Number	Designation		ENGINE 157	ENGINE 278
BA05.10-P-1001-01R	Screw/bolt, chain tensioner to cylinder crankcase/cylinder head	Nm	9	9

OIL FILTER

Number	Designation		ENGINE 278
BA18.20-P-1001-01Y	Mount, oil filter housing cover	Nm	25

Fig 2: Identifying Wrench Socket (103 589 02 09 00)

Courtesy of MERCEDES-BENZ USA