Set Basic Position Of Camshafts - AR05.20-P-6020SVZ

Engine 279 in model 223

Shown on left cylinder head

Courtesy of MERCEDES-BENZ USA

Courtesy of MERCEDES-BENZ USA

	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 threaded connections fastened using a tightening angle-based tightening process		AH00.00-P-0020-01A
Notice	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
	Remove
1	Remove front cap on left cylinder head.		AR01.30-P-5711SVZ
2	Remove front cap from right cylinder head.		AR01.30-P-5712SVZ
3	Remove retaining ring (2) at left camshaft sprocket (8) and remove centrifuge (4).
4	Position crankshaft at 30° after ignition TDC at cylinder 1.	Do not turn engine opposite to the direction of engine rotation. The timing chain can skip otherwise and engine damage can occur. Turn engine at crankshaft in direction of engine rotation until mark 30° CKA at belt pulley (1) matches with mark at timing case cover (arrow). Socket wrench bit	Fig 4
5	Remove the chain tensioner.		AR05.10-P-7800SVZ
6	Unscrew bolts (10) and remove camshaft sprockets (5, 8).	Secure timing chain to prevent it from falling down. Ensure that crankshaft does not turn out of position.
7	Install holding devices (6) and turn camshafts (3) to basic position.	Basic position of camshafts (3) is only correct if holding device (6) can be installed free of tension at left cylinder head. Basic position of camshafts (3) is only correct if holding device (6) can be installed free of tension at right cylinder head. Retaining device	Fig 3
		Retainer device	Fig 1
		Double open end wrench	Fig 2
	Install
8	Position timing chain on camshaft sprockets (5, 8) and install camshaft sprockets (5, 8).
9	Screw in the screws (10).	Camshaft sprocket bolt	*BA05.20-P-1001-02L
10	Install the chain tensioner.		AR05.10-P-7800SVZ
	Check
11	Crank engine at crankshaft several times by hand.	Do not turn engine opposite to the direction of engine rotation. The timing chain can skip otherwise and engine damage can occur. Socket wrench bit	Fig 4
12	Position crankshaft at 30° after ignition TDC at cylinder 1.	Do not turn engine opposite to the direction of engine rotation. The timing chain can skip otherwise and engine damage can occur. Turn engine at crankshaft in direction of engine rotation until mark 30° CKA at belt pulley (1) matches with mark at timing case cover (arrow). Socket wrench bit	Fig 4
13	Check basic position of camshafts (3).	Basic position of camshafts (3) is only correct if holding device (6) can be installed free of tension at left cylinder head. Basic position of camshafts (3) is only correct if holding device (6) can be installed free of tension at right cylinder head. Retaining device	Fig 3
		Retainer device If basic position of camshafts (3) is incorrect: ↓ Repeat from operation step 4 onwards again.	Fig 1
	Install
14	Place centrifuge (4) on left camshaft sprocket (8) and install retaining ring (2).	Replace O-ring (9).
15	Install front cap to the right cylinder head.		AR01.30-P-5712SVZ
16	Remove front cap on left cylinder head.		AR01.30-P-5711SVZ