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Registered
1985 500sel
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19 Posts
Discussion Starter #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.
 

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88 560SEL
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114 Posts
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.
 

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1,648 Posts
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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Mercedes 420SEL
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58 Posts
Yeah sounds like it needs a valve job. But if it's not that bad dont worry about it, it's nothing serious. Mine has been knocking on cold starts for a couple of years, it's no big deal.
 

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Registered
1985 500sel
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19 Posts
Discussion Starter #5
yeah hey thatks for those responces. THE CAR HAS BEEN KNOKING FOR A WHILE BUT IT'S JUST ANOYING TO LISTEN TO THE KNOKING. I'LL LOOK INTO GETTING A VALVE JOB.
 
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