Check Basic Position Of Camshafts - AR05.20-P-6010MNA

Engine 176 in model 463 up to model year 2019 

Engine 177 in model 205 

Engine 178 in model 190 

Shown on engine 177, left cylinder head, a 530 CKA after ignition TDC of cylinder 1 

Courtesy of MERCEDES-BENZ USA

Shown on engine 177, right cylinder head, a 530 CKA after ignition TDC of cylinder 1 

Courtesy of MERCEDES-BENZ USA

	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  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
	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
	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Remove/install
1	Remove position sensors of camshafts	Engine 176 in model 463 up to model year 2019	AR15.12-P-2144MNF
		Engine 178 in model 190	AR15.12-P-2144MNB
		Engine 177 in model 205	AR15.12-P-2144MNA
2	Remove lower engine compartment lining	Engine 178 in model 190	AR61.20-P-1105RG
		Engine 176 in model 463 as of model year 2016 up to model year 2019 except code ZQ0 (G 500 4x42)	AR61.20-P-1105GW
		Engine 177 in model 205	AR61.20-P-1105LW
3	Detach front circulation pump for low-temperature water circuit and place with attached lines and hoses to one side	Engine 176 in model 463 up to model year 2019
			AR09.41-P-6925MNF
4	Remove clamping device for poly-V belt of alternator		AR13.20-P-0010MNA
5.1	Mount measuring tool on bracket of clamping device for alternator's poly-V belt	Engine 176 in model 463 up to model year 2019 Engine 177 in model 205 Use pointer 177 589 01 21 01.
		Measuring tool	Fig 2
5.2	Mount measuring tool on bracket of clamping device for alternator's poly-V belt	Engine 178 in model 190 Use pointer 177 589 01 21 02.
		Measuring tool	Fig 2
6	Check whether the markings are present on the belt pulley	When marking is not present. ↓ Apply markings to belt pulley of crankshaft.
			AR05.10-P-7806-01MNA
7	Turn engine at center bolt of crankshaft in direction of engine rotation to 530 CKA after ignition TDC of cylinder 1	Socket wrench bit	Fig 1
	Check
8	Check basic position of camshaft	The edges (1a, 2a, 5a, 6a) of the partial segments of the segmented discs (1, 2, 5, 6) must be visible roughly in the middle in the openings of the position sensors of the camshafts. If the segmented discs (1, 2, 5, 6) are not standing in the middle. ↓ Turn engine in direction of engine rotation further through one complete revolution. If the segmented discs (1, 2, 5, 6) are still not standing in the middle in the openings of the position sensors of the camshafts. ↓ Set basic position of camshafts again.
			AR05.20-P-6020MNA
9	Install in the reverse order

Fig 1: Identifying Socket Wrench Bit (001 589 65 09 00)

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Measuring Tool (177 589 01 21 00)

Courtesy of MERCEDES-BENZ USA