Remove/Install Right Secondary Timing Chain Drive Chain Tensioner - AR05.10-P-7804MNL

Engine 176 in model 217, 222

MODIFICATION NOTES

23.06.2022	New operation step added.	Operation step 2.
23.06.2022	Special tool 001 589 65 09 00 changed to 177 589 00 03 00.	Operation step 4.

Shown on engine 176 with code M005 (4MATIC)

Fig 1: Right Secondary Timing Chain Tensioner Components Location - Engine 176 In Model 222 (Shown With Code M005)

Courtesy of MERCEDES-BENZ USA

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 area of mechanical components when moving components.	AS00.00-Z-0009-01A
	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
	Risk of injury to skin and eyes due to handling of engine oil. Risk of poisoning caused by swallowing engine oil	Wear protective gloves, protective clothing and safety glasses. Do not fill engine oil into beverage containers.	AS18.00-Z-0001-01A
	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
Notice	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
Notice	Notes on threaded connections fastened using a tightening angle-based tightening process		AH00.00-P-0020-01A
	Remove/install
1	Remove center and front bottom engine compartment lining.		AR61.20-P-1105LF
		: Install center and front engine compartment lining only after leak test has been performed.
2	Position engine at center bolt of crankshaft to 53° after ignition TDC of cylinder 1.		AR01.10-P-1000-01SZ
		Only turn engine at the center bolt of the crankshaft in the direction of engine rotation using the specified box wrench. Otherwise, damage to the engine or even failure of the engine may occur.
		Ring wrench	Fig 2
		Measuring tool	Fig 3
3	Check basic position of camshafts.		AR05.20-P-6010MNL
		: Do not install upper engine cover until after the leak test.
4	Continue to turn engine on the center bolt of the crankshaft in the direction of engine rotation until the pointer of the measuring tool (9) points to the rib (17).	Only turn engine at the center bolt of the crankshaft in the direction of engine rotation using the specified box wrench. Otherwise, damage to the engine or even failure of the engine may occur. Only turn crankshaft when the secondary chain tensioner (1) is installed. Otherwise, the timing chain skips. Rib (17) corresponds to 90° crank angle after ignition TDC of cylinder 1.
		Ring wrench	Fig 2
		Measuring tool If the crankshaft was turned too far, ↓ Continue turning engine at center bolt of crankshaft a further two revolutions in direction of engine rotation until pointer of measuring tool (9) points to rib (17).	Fig 3
5	Remove the alternator.		AR15.40-P-5032MNL
6	Unscrew screws (4) and remove bracket (3)	Screw, alternator bracket to crankcase/oil pan	*BA15.40-P-1004-01T
7	Remove secondary chain tensioner (1).	Only turn crankshaft when the secondary chain tensioner (1) is installed. Otherwise, the timing chain skips. : Install new sealing ring for secondary chain tensioner (1).
		Chain tensioner at top to crankcase	*BA05.10-P-1002-01V
8	Install in the reverse order.
	Concluding tasks
9	Check engine oil level and correct if necessary.
			AP18.00-P-1812SKI
	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	Perform engine test run. While doing so, check engine for proper operation and leak tightness