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Home >> Mercedes Benz >> 2025 >> S580 >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Complete Engine (1 Of 2) -- 223 Chassis >> Testing & Repair >> Remove/Install Oil Separator >> Remove/Install Oil Separator - AR01.20-P-9750SB

Remove/Install Oil Separator - AR01.20-P-9750SB

Engine 256.9 in model 223 

G16189477Courtesy 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  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
REMOVINGINSTALLING Remove/install     
1
REFER TO MAINTENANCE
Remove upper engine cover. INSTALLATION IMPORTANT Do not install upper engine cover until after the leak test. AP01.10-P-2405-01OB
2 Remove noise insulation above cylinder head cover.    
3 Remove the engine wiring harness from the oil separator (5) and place it to one side.    
4 Remove bleed line (6) from oil separator (5) and seal openings with suitable stop plugs. SPECIAL TOOL Record plug Fig 1
5 Remove bolts (1 to 4) in reverse numerical order. INSTALLATION IMPORTANT Observe tightening sequence.
TORQUE SPECIFICATION Screw/bolt, oil separator to cylinder head cover
*BA01.20-P-1003-01L 
6 Remove oil separator (5) and seal openings with a lint-free rag. INSTALLATION IMPORTANT Replace seals.  
7 Remove the adhesive label from the oil separator (5). If the oil separator (5) is being replaced.  
CLEANING Clean     
8 Clean sealing surfaces with a lint-free rag.    
9 Install in the reverse order.    
10
REFER TO MAINTENANCE
Check engine oil level and correct if necessary.   AP18.00-P-1812A
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
11 Perform engine test run. While doing so, check engine for proper operation and leak tightness.    
CRANKCASE VENTILATION, CYLINDER HEAD COVER

Number Designation Engine 256.9
BA01.20-P-1003-01L Screw/bolt, oil separator to cylinder head cover Nm 8
Fig 1: Identifying Record Plug (129 589 00 91 00)
G16145009Courtesy of MERCEDES-BENZ USA