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#1
6th April 2009, 09:24 PM
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S8 Solid Tappets Adjustment
I seem to remember both form articles when the S8 came out in 1997 and from the service book from my three previous 340bhp S8s that unlike the standard the 4.2 they had solid tappets that required adjustment at services. I now have a 360bhp model, but there is nothing in the service book about tappet adjustment. Am I imagining things. Did the tappets perhaps go hydraulic on the newer cars?
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#2
7th April 2009, 06:48 AM
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The ABZ and AHC had cam followers that were hydrolic. They did however come in varying thickness, I suspect so that wear could be overcome as hydrolics alone were not enough (could have just been build tollerances though).
The 40V motors don't! From what I can tell from the drawings the cam lobes seem to contact direct onto the valves........  And the 32V 
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Conan (the Librarian) Watch it if you dare Currently, 2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block. 1997 4.2 A8SQ - the Projekt. 12 years and ongoing! 1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard 2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion. 2005 C5 Allroad 2.5TDi FE - Grey - Workhorse. 2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter. Previously 2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex 1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure. 1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex. 2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on. 1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8. And a list of non VAG going back 40 years before I saw the light. 
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#3
8th April 2009, 09:01 PM
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Having just rebuilt both cylider heads on my S8 to cure various oil leaks, I thought I could shed a little more light on this subject.
Firsly the 40v motors are all hyraulic followers. The 32v motors like mine have hydraulic followers on the exhaust valves, and solid followers on the inlet valves. Underneath the solid followers, on top of the valves are lash caps. These come in various thicknesses, to allow valve clearance adjustment. Not the easiest things to adjust, and not recommended for the faint hearted!!!! Hope this helps you out.
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#4
9th April 2009, 08:55 AM
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Thanks for the response. It does help because it confirms I don't need to get anything adjusted.
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Linear Mode
