Remove/install tensioning rail

AR05.10-P-8127VA

28.11.11

ENGINES 272 in MODEL 171

P05.10-2207-06

Shown on engine 272 up to engine number 30089231

1a Tensioning rail

P05.10-2390-06

Shown on engine 272 from engine number 30089233

1a Tensioning rail

P05.20-2165-06

5 Center valve of exhaust camshaft

6 Center valve of intake camshaft

7 Pulse wheel of exhaust camshaft

8 Pulse wheel for intake camshaft

9 Camshaft adjuster of exhaust camshaft

10 Camshaft adjuster for intake camshaft

11 Auxiliary bearing cap of exhaust camshaft

12 Auxiliary bearing cap of intake camshaft

P05.20-2167-04

14 Bore in camshaft adjuster

15 Dowel pin in pulse wheel

P05.20-2166-10

16 Dowel pin in camshaft adjuster

17 Bore in camshaft

 	Remove/install
1	Open engine hood	 Only close engine hood after carrying out a leaktightness check.	AR88.40-P-1000V
2	Remove air filter housing		AR09.10-P-1150VA
3	Remove front covers from cylinder heads	Right front cover	AR01.30-P-5700VA
		Left front cover	AR01.30-P-5700VB
4	Remove cover from centrifuge		AR01.20-P-2120V
5	Remove centrifuge		AR01.20-P-2100VA
6	Turn engine at crankshaft in the direction of engine rotation to 40° after ignition TDC and check position of camshafts		AR05.20-P-6010-01VB
7	Lock gear backlash compensation of the camshaft adjuster (9) at the right exhaust camshaft	 The tooth flanks are held against each other by spring pressure and should not be skewed, otherwise the camshaft adjuster will be irreparably damaged.	AR05.20-P-7201-05VA
8	Loosen center valve (5) on right exhaust camshaft	 Observe loosening direction. When releasing center valve counterhold the exhaust camshafts at the rear using a suitable tool. Do not unscrew the center valve.	AR05.20-P-7201-06VA
			*BA05.20-P-1009-02A
9	Remove right cylinder head cover		AR01.20-P-5014VB
10	Remove center valve (5) of right exhaust camshaft and remove pulse wheel (7)	 Check on pulse wheel whether dowel pin (15) or pin has been sheared off. Remove sheared pins or dowel pins from the camshaft adjuster (9).
		 Installation: Always replace the pulse wheel. When tightening the center valve, there is a risk of shearing off the dowel pin and pin on the pulse wheel. Before assembling, oil the center valve at the contact surface with the pulse wheel.
		 Installation: Align dowel pin on the pulse wheel with the bore (14) in the camshaft adjuster.
11	Pull camshaft adjuster (9) to the front from the RH exhaust camshaft while counterholding the exhaust camshaft at the rear using a suitable tool	 Installation: Align dowel pin (16) in the camshaft adjuster with bore (17) in the exhaust camshaft.
12	Remove auxiliary bearing cap (11) on the right exhaust camshaft and take out the exhaust camshaft		*BA05.20-P-1010-02A
13	Remove chain tensioner	M241.5	AR05.10-P-7800VA
		M221.5	AR05.10-P-7800VB
		 Installation: Install new chain tensioner with thread of M221.5. 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.
14	Remove tensioning rail bolt	 Installation: When installing, coat the tensioning rail bolt with sealing compound.	AR01.30-P-5800-04V
			*116589013400
			*116589203300
		Loctite 5970 sealant	*BR00.45-Z-1013-01A
15	Pull tensioning rail (1a) upwards and out of the engine
16	Install in the reverse order

 Camshaft, camshaft adjustment

Number	Designation			Engine 272


BA05.20-P-1009-02A	Center valve for pulse wheel/camshaft adjuster to camshaft		Nm	145
BA05.20-P-1010-02A	Bolt, auxiliary bearing cap to cylinder head	Stage 1	Nm	8
		Stage 2	°	-

116 589 01 34 00

Threaded stud

Impact extractor

116 589 20 33 00

Repair materials

Number	Designation	Order number
BR00.45-Z-1013-01A	Loctite 5970 sealant	A 003 989 98 20

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