LEMON Manuals: Even more car manuals for everyone
Home >> Mercedes Benz >> 2025 >> S580 >> Repair and Diagnosis >> Engine Mechanical >> Timing Belt >> Engine Timing (1 Of 2) -- 223 Chassis >> Testing & Repair >> Remove/Install Timing Chain Tensioner >> Remove/Install Timing Chain Tensioner - AR05.10-P-7800SVZ

Remove/Install Timing Chain Tensioner - AR05.10-P-7800SVZ

Engine 279 in model 223 

G16189649Courtesy of MERCEDES-BENZ USA
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
REMOVINGINSTALLING Remove/install     
1 Remove electric air pump (M33) with bracket (1).   AR14.30-P-7251SVZ
2 Place piston for cylinder 1 at a 30° CKA after TDC (for ignition). NOTES
Do not crank engine in the direction opposite to the direction of engine rotation.
The timing chain can skip otherwise and engine damage can occur.
IMPORTANT Rotate engine at the crankshaft in the direction of engine rotation until the scribe mark for 30° CKA on the belt pulley corresponds with the scribe mark on the timing case cover.
SPECIAL TOOL Socket wrench bit
Fig 1
3 Remove screw (2) and take off sealing ring (3). INSTALLATION IMPORTANT : Replace sealing ring (3).
TORQUE SPECIFICATION Screw/bolt at chain tensioner housing
*BA05.10-P-1002-01T 
4 Pull compression spring (4) and filler pin (5) out of the chain tensioner housing (7).  
5 Remove chain tensioner housing (7) from the timing case cover. IMPORTANT Ensure that pin (6) does not fall out of the chain tensioner housing (7).
INSTALLATION IMPORTANT : Replace sealing ring (8).
TORQUE SPECIFICATION Chain tensioner housing to cylinder head
*BA05.10-P-1001-01T 
6 Install in the reverse order.    
INSPECT Check     
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
7 Perform engine test run and check engine for leak tightness.    
TIMING CHAIN, CHAIN TENSIONER

Number Designation Engine 279
BA05.10-P-1001-01T Chain tensioner housing to cylinder head Nm 120
TIMING CHAIN, CHAIN TENSIONER

Number Designation Engine 279
BA05.10-P-1002-01T Screw/bolt at chain tensioner housing Nm 80
Fig 1: Identifying Socket Wrench Bit (001 589 65 09 00)
G09981907Courtesy of MERCEDES-BENZ USA