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Home >> Mercedes Benz >> 2021 >> CLS450 Base >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Timing - 257 Chassis >> Testing & Repair >> Replace Valve Stem Seals - AR05.30-P-3510MSA

Replace Valve Stem Seals - AR05.30-P-3510MSA

Engine 256.9 in model 213, 238, 257, 290 

Example illustration 

G14548138Courtesy of MERCEDES-BENZ USA
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 Remove the valve springs (3).   AR05.30-P-3021MSA 
2 Remove valve stem seals (5) using pliers (07)   AR05.30-P-3510-01MRT 
REFER TO CAPACITIES & SPECIFICATIONS Specified engine oils (service) - Overview   BB00.40-P-0223-02A
    SPECIAL TOOL Drift Fig 2
    SPECIAL TOOL Pliers Fig 1
INSPECT Check     
3 Check valve stems for formation of burrs and pitting. If ridging is present of the valve stems, ↔ deburr valve stems. If pitting is present on the valve stems, ↔ replace valves (6).  
      AR05.30-P-3511MSA 
4 Install in the reverse order.    
Fig 1: Identifying Pliers (606 589 00 37 00)
G11972796Courtesy of MERCEDES-BENZ USA
Fig 2: Identifying Drift (604 589 00 43 00)
G11128333Courtesy of MERCEDES-BENZ USA