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Join Date: Aug 2015
Location: Edina, MN
Posts: 41
Do Not Interchange Valve Tappets - Cylinder Head

engine: 996 911 M96.04

The service manual (and pretty much anyone) instructs to not interchange the 24 valve tappets in the cylinder heads. also not to use magnets to remove.

I therefore took great care in removing and storing in egg cartons the valve tappets so I did not interchange upon assembly. marked the egg cartons 1-3 and 4-6 and included up arrows.

this process was solid until I knocked the egg cartons off my shelf and now have 24 randomly scattered tappets on the floor.

These tappets have 40k on them and no visible scoring and look brand new.

Does anyone have access to the specs on new tappets? (I assume diameter and height are the relevant specs) and are there tolerances other than no visible scoring?

Dare I re-use if my valve tappets are within a certain spec?

Old 11-28-2017, 09:58 AM
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silverc4s's Avatar
Join Date: Apr 1999
Location: Austin, TX, America
Posts: 3,073
We don’t know very much about your engine here, as this is primarily the air cooled crowd. You might have better luck on Rennlist forums.

69 911 T Targa, 2.4E w/carbs (1985-2001)
70 911 S Coupe, 2nd owner (1989- 2015)
73 911 T Targa, 3.2 Motronic (2001- )
Old 12-02-2017, 10:25 AM
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prschmn's Avatar
Join Date: Feb 2007
Location: Northeast
Posts: 379
[I]t may not be pure but if I couldn't find any damage from dropping or wear
I'd use them. I haven't ever bothered to measure a 996 cam but most all
hydraulic lifter cam lobes are ground at a slight angle so the lifter rotates
worn lifters will show the effects. If you aren't seeing that I wouldn't worry a lot about them.
1981 Targa-messed with. 91 C2 supercharged track rat
97 Van dieman F2000-gone but not forgotten
30 plus years of rebuilding services
Old 12-02-2017, 11:39 AM
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