Volkswagen Passat 1995 Official Factory Repair Manual page 104

Cylinder head, disassembling and assembling
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW...
If there is less than 0.1 mm (0.004 in.)
play, or no play, check as follows:
- Press down with suitable non-
marring tool (e.g. wood or plastic).
If the lifter can be pushed down more
than 0.1 mm (0.004 in.) before valve
starts to open:
- Replace valve lifter.
CAUTION!
After installing new hydraulic valve
lifters, DO NOT start the engine for
approx. 30 minutes in order to allow
the lifters to bleed down. Otherwise
there is danger of the valves being
damaged by interference with the
pistons.
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5/12/2004