07-27-2010, 12:37 AM
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Registered User
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Join Date: Jun 2009
Location: Dana Point, CA
Posts: 12
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Valve Shim Replacement
I just did a valve job on my '81 380SL and after installing them I checked the position/height of the hydraulic lifers and thickness of the Valve Shims using a go/no go tool. They all show a minus deviation of about 1mm indicating the need to put in a thicker thrust washer. I currently have thrust pieces that are 4.75mm thick.
Is a 1mm error correctable with the next size up thrust washer (5.1mm) or do I need to go thicker. Also, what kind of improvement can one expect in performance? The engine seems to run pretty good, but I'll know more after the emmissions test. 
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