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knoking valves

918 views 4 replies 4 participants last post by  PimpinBenzo 
#1 ·
The valves on my 85 500sel are knoking how can that be fixed. Can they be adjusted or do they have to be replaced.
 
#2 ·
Nothing to adjust I'm afraid. The hydro valve lift adjusters are there to take care of the adjustment issue. Knocking valves is usually caused by:
Worn camshaft
Worn valve rockers, or
Worn hydro valve adjusters

Any one of, any combination of, or all three causes will cause knocking.
 
#3 ·
The valves are "adjustable", you select different sizes of shim pucks based on valve stem height which changes due to wear. Mercedes makes a tool for reading whether the shim is too big or too small. However if they are really making a racket instead of the "ticking" then maybe a valve job should be done first.
 
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