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Remove/Install Tensioning Rails On Secondary Chain Drive - AR05.10-P-8129MNL

Engine 176 in model 217, 222 

Fig 1: Secondary Chain Drive Tensioning Rails Component Location - Engine 176 In Model 217
G15350633Courtesy of MERCEDES-BENZ USA
WARNING 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
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
CAUTION Risk of injury  caused by scraping or rutting 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
Topical note Notes on avoiding damage through contamination and foreign objects   AH00.00-P-5000-01A
REMOVINGINSTALLING Remove/install     
1 Remove camshaft positioner of right intake camshaft INSTALLATION IMPORTANT:  Only install upper engine cover and lower engine compartment paneling after the performing a leak test. AR05.20-P-7209MNL 
2 Remove camshaft positioner of left exhaust camshaft   AR05.20-P-7208MNL 
3 Remove tensioning rail bolt (2) SPECIAL TOOL Threaded bolt Fig 2
    SPECIAL TOOL Impact extractor Fig 3
4 Remove tensioning rail bolt (4) SPECIAL TOOL Threaded bolt Fig 2
    SPECIAL TOOL Impact extractor Fig 3
5 Remove tensioning rails (1, 3) upwards    
6 Check tensioning rails (13) for wear, galling and damage In case of a complaint
↓
Replace the relevant tensioning rail (1, 3).
 
7 Install in the reverse order    
8 Check oil level of engine and correct it    
REFER TO MAINTENANCE     AP18.00-P-1812SKI
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
9 Perform an engine test run and check engine for proper operation and leak tightness    
10 Install lower engine compartment paneling   AR61.20-P-1105LF
11 Install upper engine cover    
Fig 2: Identifying Threaded Bolt (102 589 00 34 00)
G13655605Courtesy of MERCEDES-BENZ USA
Fig 3: Identifying Impact Extractor (116 589 20 33 00)
G11972652Courtesy of MERCEDES-BENZ USA