Remove/install chain tensioner

AR05.10-P-7800MFD

Remove/install chain tensioner

18.02.2020

Engine

282 in model 118, 177, 247

1

Bolts

5

Cover

2

Chain tensioner pistons

6

Chain tensioner

3

Bolts

7

Timing case

4

Hole

A

Sealing surface

 Caution

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

 Caution

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

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A



Remove

1

Remove lower engine compartment paneling

AR61.20-P-1105MFA

2

Remove belt pulley.

AR03.30-P-1600MFD

3

Unscrew screw/bolts (1).

4

Remove cap (5) from chain tensioner (6) with a suitable tool.

5

Press back piston from chain tensioner (2) in the direction of the arrow and engage position by inserting a suitable pin in the bore (4) (approx. 3.2 mm diameter).

6

Remove screws (3) and remove chain tensioner (6).



Clean

7

Clean sealing surface (A) on timing case (7) and sealing surface on the cap (5) of chain tensioner (6).

AR01.00-P-0050-01A

Loctite 7063 (400 ml) cleaning spray

*BR00.45-Z-1046-04A

Loctite 7200

*BR00.45-Z-1038-04A



Install

8

Lay chain tensioner (6) on the crankcase and tighten screws (3).

 Bolt, chain tensioner to crankcase

*BA05.10-P-1001-03D

9.1

Pull factory installed retainer out of the bore (4) of the chain tensioner (6).

If a new chain tensioner is installed.

9.2

Pull out the suitable pin in bore (4) (approx. 3.2 mm diameter) of the chain tensioner (6).

If the chain tensioner is reused.

10

Apply sealant to the cap (5) of the chain tensioner (6).

Notes on distribution of sealant on housing of chain tensioner

AH05.10-P-0001-01MFD

Notes on application of flange sealants to seal major assemblies

AH00.00-P-0500-01MNE

Sealant, Loctite 5970, 50 ml

*BR00.45-Z-1013-01A

11

Install cap (5) of chain tensioner (6) and tighten screws (1).

12

Install the belt pulley.

AR03.30-P-1600MFD



Check

13

Check engine oil level, correct if necessary.



AP18.00-P-0101MFB

 Warning

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

 Warning

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

14

Perform engine test run; while doing so, check function and leak tightness of the engine.

15

Install lower engine compartment paneling.

AR61.20-P-1105MFA

 Chain drive, belt drive

Number

Designation

Engine 282

BA05.10-P-1001-03D

Bolt, chain tensioner to crankcase

M6

Nm

8

Repair materials

Number

Designation

Order number

BR00.45-Z-1013-01A

Sealant, Loctite 5970, 50 ml

A 003 989 98 20 10

BR00.45-Z-1038-04A

Loctite 7200

Henkel AG & Co. KGaA
http://www.loctite.de

BR00.45-Z-1046-04A

Loctite 7063 (400 ml) cleaning spray

A 001 986 71 71 09