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#1
07-27-2010, 12:37 AM
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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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#2
07-27-2010, 08:36 AM
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If your (-) deviation is 1mm in all valves then you would require shims of 5.8mm PN 1170530653 which is the nearest to 4.75+1. The hydraulic compensating element can compensate for the 0.05 excess between 5.75 (not available) and 5.8 but will not compensate if you go under to 5.1 or 5.45 options.
__________________
 Deltacom ~ Absit Iniuria Verbis ~
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#3
07-29-2010, 12:55 PM
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Are you getting any ticking from the valve train? If not, I wouldn't change the pads.
__________________
Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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#4
08-08-2010, 12:39 PM
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Ticking? Very Little. My big question is what kind of performance improvement can one expect? My intuition tells me that the result of being 1/2 to 1 mm off in the (-) causes the valves to open later and close earlier than if they were in perfect adjustment. But is that enough to worry about?
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