Set basic position of the balance shaft - AR03.20-P-3638CD

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ENGINE 651 in MODEL 166, 172, 204, 207, 212, 218, 221

Fig 1: Balancing Shaft Basic Position

Courtesy of MERCEDES-BENZ USA

	Remove
1	Secure vehicle on vehicle lift	ENGINE 651 in MODEL 166	AR00.60-P-0100GZ
		ENGINE 651 in MODEL 172	AR00.60-P-0100T
		ENGINE 651 in MODEL 204, 207	AR00.60-P-0100CW
		ENGINE 651 in MODEL 212, 218	AR00.60-P-0100EWS
		ENGINE 651 in MODEL 221	AR00.60-P-0100SX
2	Remove timing case cover		AR01.40-P-8000CD
3	Remove oil pan	ENGINE 651 in MODEL 166.0	AR01.45-P-7500GQA
		ENGINE 651 in MODEL 172	AR01.45-P-7500SLK
		ENGINE 651 in MODEL 204, 207, 212 with TRANSMISSION 711 ENGINE 651 in MODEL 204, 212 with TRANSMISSION 722 (except 722.9) ENGINE 651 in MODEL 207, 218 with TRANSMISSION 722 ENGINE 651 in MODEL 212 with TRANSMISSION 724.2	AR01.45-P-7500CD
		ENGINE 651 in MODEL 204, 212 only 4MATIC	AR01.45-P-7500OMD
		ENGINE 651 in MODEL 204.9 Except 4MATIC	AR01.45-P-7500OND
		ENGINE 651 in MODEL 221	AR01.45-P-7500SXA
	Adjust
4.1	Set piston on cylinder 1 with the counterholder to TDC (TDC)	ENGINE 651 in MODEL 166, 172, 204, 207, 212, 218, 221 without CODE B03 (ECO start/stop function) Rotate engine at crankshaft in direction of engine rotation until the 0° marking on the belt pulley/vibration damper coincides with the marking on the cylinder crankcase.
4.1		Counterholder	Figure
4.3	Set piston on cylinder 1 with a suitable tool to TDC (TDC)	ENGINE 651 in MODEL 166, 172, 204, 207, 212, 218, 221 with CODE B03 (ECO start/stop function) Rotate engine at crankshaft in direction of engine rotation until the 0° marking on the belt pulley/vibration damper coincides with the marking on the cylinder crankcase.
5	Loosen screw/bolts (1) for the drive wheels (2)
6	Turn Lanchester balance shafts and apply the assembly tool (4, 5)	The shaft offset (3) must point in the direction of the cylinder head. Engine damage can occur otherwise.
6		Assembly tool	Figure
7	Turn back Lanchester balance shafts and fix in place with an assembly tool (6)	Assembly tool	Figure
8	Tighten screw/bolts (1) on drive gears (2)	Screw/bolt, drive gear to Lanchester balance shaft	*BA03.20-P-1001-02H
9	Detach assembly tool (6)	Assembly tool	Figure
10.1	Remove assembly tool (4, 5)	ENGINE 651 in MODEL 166, 172, 204, 207, 212, 218, 221 with CODE B03 (ECO start/stop function) Position engine on crankshaft with a suitable tool to 30° after top dead center.
10.2	Remove assembly tool (4, 5)	ENGINE 651 in MODEL 166, 172, 204, 207, 212, 218, 221 without CODE B03 (ECO start/stop function) Place engine on crankshaft with a counterholder to 30° after ignition TDC.
10.2	Remove assembly tool (4, 5)	Counterholder	Figure
11	Check basic position of the balance shafts		AR03.20-P-3637CD
	Install
12	Install oil pan	ENGINE 651 in MODEL 166.0	AR01.45-P-7500GQA
		ENGINE 651 in MODEL 172	AR01.45-P-7500SLK
		ENGINE 651 in MODEL 204, 207, 212 with TRANSMISSION 711 ENGINE 651 in MODEL 204, 212 with TRANSMISSION 722 (except 722.9) ENGINE 651 in MODEL 207, 218 with TRANSMISSION 722 ENGINE 651 in MODEL 212 with TRANSMISSION 724.2	AR01.45-P-7500CD
		ENGINE 651 in MODEL 204, 212 only 4MATIC	AR01.45-P-7500OMD
		ENGINE 651 in MODEL 204.9 Except 4MATIC	AR01.45-P-7500OND
		ENGINE 651 in MODEL 221	AR01.45-P-7500SXA
13	Install timing case cover		AR01.40-P-8000CD
14	Release vehicle on lifting platform	ENGINE 651 in MODEL 166	AR00.60-P-0100GZ
		ENGINE 651 in MODEL 172	AR00.60-P-0100T
		ENGINE 651 in MODEL 204, 207	AR00.60-P-0100CW
		ENGINE 651 in MODEL 212, 218	AR00.60-P-0100EWS
		ENGINE 651 in MODEL 221	AR00.60-P-0100SX
	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
15	Check for oil leaks with engine running		AS00.00-Z-0005-01A

BALANCE SHAFT

Number	Designation			ENGINE 651
BA03.20-P-1001-02H	Screw/bolt, drive gear to Lanchester balance shaft	Stage 1	Nm	50
BA03.20-P-1001-02H	Screw/bolt, drive gear to Lanchester balance shaft	Stage 2	∠°	90

Fig 2: Identifying Counterholder (651 589 00 40 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Assembly Tool (651 589 02 63 00)

Courtesy of MERCEDES-BENZ USA