Remove/install tensioning rail - AR05.10-P-8127SX

ENGINES 273 in MODEL 216 

ENGINES 272, 273 in MODEL 221 

Fig 1: Identifying Tensioning Rail Remove/Install Components - Shown On Engine 273

Courtesy of MERCEDES-BENZ USA

Shown on engine 273 

Fig 2: Identifying Tensioning Rail Remove/Install Components (1 Of 2)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Tensioning Rail Remove/Install Components (2 Of 2)

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Open engine hood
2	Remove air filter housing		AR09.10-P-1150SX
	Risk of death  when touching components on vehicles with high-voltage on-board electrical system	Do not touch components and open lines of the high-voltage on-board electrical system. Persons who are carriers of electronic implants (e.g. cardiac pacemakers), must not  carry out any work on high-voltage on-board electrical systems.	AS54.00-Z-0001-01A
3	Perform disable for the high-voltage on-board electrical system	Model 221.095/195 After completing the work, attach initial startup event log together with the disconnection log to the vehicle file.	AR54.10-P-1150SXH
	Note on the voltage on-board electrical system		AH54.00-P-0010-01A
4	Remove front covers from cylinder heads	Front cover on the right	AR01.30-P-5700SY
		Front cover on the left	AR01.30-P-5700SX
5	Remove centrifuge		AR01.20-P-2100SX
6	Crank engine at crankshaft center bolt in the direction of engine rotation to a 40° crankshaft angle after ignition TDC and check position of camshafts		AR05.20-P-6010-01VB
			Figure
7	Lock gear backlash compensation for camshaft adjuster (13) at right exhaust camshaft (1)		AR05.20-P-7201-05VA
8	Loosen center valve (5) on right exhaust camshaft (1)	Observe loosening direction.	AR05.20-P-7201-06VA
			*BA05.20-P-1009-02A
9	Remove right cylinder head cover		AR01.20-P-5014SY
10	Remove center valve (5) for right exhaust camshaft (1) and remove pulse wheel (9)	Check dowel pin (18) and pin (19). If dowel pin (18) or pin (19) has sheared off, it must be removed from camshaft adjuster (13). Always replace pulse wheel (9). When tightening center valve (5), there is a risk that dowel pin (18) or pin (19) on pulse wheel (9) may shear off. Before assembling, lubricate center valve (5) at the contact surface with pulse wheel (9). Align dowel pin (18) on pulse wheel (9) with bore (20) in the camshaft adjuster (13).
11	Counterhold right rear exhaust camshaft (1) using a suitable tool and detach camshaft adjuster (13) from right exhaust camshaft (1) in the forward direction	Align dowel pin (21) in camshaft adjuster (13) to fitted bore (22) in exhaust camshaft (1) and install camshaft adjuster (13) in its basic position:
		See "Check basic position of camshafts".	AR05.20-P-6010-01VB
12	Remove auxiliary bearing cap (17) on right exhaust camshaft (1) and take out exhaust camshaft (1)		*BA05.20-P-1010-02A
13	Remove chain tensioner	Install new chain tensioner  . The previously installed chain tensioner must not be reinstalled because during removal, its pressure pin is pressed into the end position. The thrust pin latch prevents this return stroke. This would overstretch the timing chain on reinstalling.	AR05.10-P-7800SX
14	Remove tensioning rail bolt (23)	Apply sealant to tensioning rail bolts (23) before assembly.	AR01.30-P-5800-04V
			Fig 6
			Fig 5
		Loctite 5970 sealant	*BR00.45-Z-1013-01A
15	Pull tensioning rail (24) up and out of timing case
16	Install in the reverse order

Fig 4: Identifying Wrench Socket (001 589 65 09 00)

Courtesy of MERCEDES-BENZ USA

Fig 5: Identifying Impact Extractor (116 589 20 33 00)

Courtesy of MERCEDES-BENZ USA

Fig 6: Identifying Threaded Stud (116 589 01 34 00)

Courtesy of MERCEDES-BENZ USA