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Check Hydraulic Valve Play Compensation Elements - AR05.00-P-2012MSA

Engine 256.9 in model 213, 238, 257, 290 

G14548065Courtesy 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
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
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
Topical note Notes on avoiding damage through contamination and foreign objects   AH00.00-P-5000-01A
INSPECT Check     
1 Check engine oil level and correct.    
REFER TO MAINTENANCE   Engine 256.9 in model 213, 238, 290 AP18.00-P-1812MKI
REFER TO MAINTENANCE   Engine 256.9 in model 257 AP18.00-P-1812BKI
2 Warm up engine to normal operating temperature.    
3 Switch off ignition and store transmitter key outside of transmitter range (min. 2 m).    
REMOVINGINSTALLING Remove/install     
4 Remove camshaft housing.   AR05.20-P-6997MSA 
INSPECT Check     
5 Press together hydraulic valve play compensation elements (4); to do this, depress the roller-type rocker arms (2) using a suitable drift. NOTES
Do not use a steel tool.
Otherwise, damage to the roller-type rocker arms (2) will occur.
IMPORTANT It must not be possible to press together the hydraulic valve play compensation elements (4) with normal force of the hand and it should be possible to press them together only very slowly when great pressure is applied.
If one hydraulic valve play compensation element (4) lowers too much compared to the others, ↓
Replace corresponding hydraulic valve play compensation element (4).
If several hydraulic valve play compensation elements (4) lower, ↓
Check oil pressure.
AR05.00-P-2013MSA 
      AR18.00-P-1250MSA
6 Install in the reverse order.