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

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Engine 264 in model 205, 253

MODIFICATION NOTES

13.06.2019	Operation step added.	Operation step 6, 20
26.06.2019	Method description adapted.	Operation step 1, 9, 19
26.06.2019	Basic data and special tool, added.	Operation step 11

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 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
	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
	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
	Remove
1	Remove right charge air line, remove charge air cooler with connected lines, and fasten so that they are free of tension.		AR09.41-P-6817MRI
2	Turn the engine at crankshaft center screw in the direction of engine rotation to ignition TDC at cylinder 1.	The TDC marking of the belt pulley must be aligned with the positioning edge on the timing case cover.
3	Remove cylinder head cover (8).		AR01.20-P-5014MRI
4	Install hold-down tools (2a, 2b) and screw in screws (5) until the bearing brackets (4) lie flat on the cylinder head.	Holding device	Fig 1
5	Remove camshaft positioners.		AR05.20-P-7204MRI
6	Remove brackets (3).	Engine 264 in model 253 The hold-down tool (2a) remains bolted to the cylinder head. Holding device	Fig 1
	Adjust
7	Turn camshafts (1) in the basic position.	Turn camshafts (1) exclusively with the socket wrench socket or screw (N 000000 005561) in combination with disk (A 604 990 00 40). Otherwise, this will damage the camshafts (1). Camshafts (1) are in the basic position if the edge (6a) of the pulse wheel (6) and the bearing slot (7a) of the pulse wheel (7) point vertically upward. Socket	Fig 2
8	Install brackets (3).	The holding device is not suitable for bringing the camshafts (1) into position. This leads to damage on the brackets (3) and incorrect timing. Turn camshafts (1) exclusively with the socket wrench socket or screw (N 000000 005561) in combination with disk (A 604 990 00 40). Otherwise, this will damage the camshafts (1). It must be possible to mount and install the brackets (3) without pressure . Otherwise, this will damage the camshafts (1) and lead to incorrect timing. Socket	Fig 2
		Holding device	Fig 1
	Install
9	Install camshaft positioners and timing chain, then slightly tighten control valves by hand.
	Specified engine oils (service) - Overview		BB00.40-P-0223-02A
		When installing the camshaft positioners and the timing chain, ensure that the crankshaft does not twist. Wet thread and bolt head contact surface of control valve with engine oil.	AR05.20-P-7204MRI
10	Install the chain tensioner.		AR05.10-P-7800MRI
11	Tighten control valves.		AR05.20-P-7204MRI
	Notes on threaded connections fastened using a tightening angle-based tightening process		AH00.00-P-0020-01A
		Control valve of pulse wheel/camshaft positioner to camshaft	*BA05.20-P-1002-05A
		Socket wrench bit	Fig 3
12	Remove brackets (3) from hold-down tool (2a).	The hold-down tools (2a, 2b) remain attached to the cylinder head. Holding device	Fig 1
13	Loosen screws (5) until camshafts (1) are rotatable.	The hold-down tools (2a, 2b) remain attached to the cylinder head. Holding device	Fig 1
	Check
14	Turn engine at the crankshaft center screw by two revolutions in the direction of engine rotation and turn to ignition TDC on cylinder 1.	The TDC marking of the belt pulley must be aligned with the positioning edge on the timing case cover.
15	Screw in screws (5) until the bearing brackets (4) lie flat on the cylinder head.	Holding device	Fig 1
16	Check basic position of camshafts (1); for this purpose, install brackets (3) on hold-down tool (2a).	It must be possible to mount and install the brackets (3) without pressure . Otherwise, this will damage the camshafts (1) and lead to incorrect timing. Holding device	Fig 1
		Holding device If the brackets (3) cannot be attached, ↓ Repeat work procedure from operation step 5.	Fig 1
17	Remove brackets (3) and hold-down tools (2a, 2b).	Holding device	Fig 1
18	Install cylinder head cover (8).		AR01.20-P-5014MRI
19	Attach charge air cooler and install right charge air line.		AR09.41-P-6817MRI
	Check
	Risk of burn injuries , suffocation and poisoning when working on the exhaust system and the components connected to it. Risk of suffocation and risk of poisoning caused by inhalation of gaseous and solid components of the exhaust. Risk of poisoning caused by skin contact with solid components of the exhaust.	Wear protective clothing and safety glasses. Use the extraction system. Move people out of the hazard area.	AS49.00-Z-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
20	Perform engine test run. While doing so, check engine for proper operation and leak tightness.