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Valve dimensions > < Renewing valve stem oil seals with cylinder head removed
Checking hydraulic valve compensation elements
Checking hydraulic valve compensation elements
Special tools and workshop equipment required
t  Feeler gauge
  Note
t  Hydraulic compensation elements cannot be serviced.
t  Irregular valve noises when starting engine are normal.
Procedure
–  Start engine and run until coolant temperature reaches approx. 80 °C.
–  Increase engine speed to approx. 2500 rpm for 2 minutes (perform road test if necessary).
If the hydraulic tappets are still noisy, locate defective tappet as follows:
–  Remove cylinder head cover (left or right) → Chapter.
–  Rotate crankshaft until cam of hydraulic compensation element to be checked faces upwards. The procedure is:
t  Vehicles with manual gearbox: push vehicle forwards with 4th gear engaged and ignition switched off.
t  Vehicles with multitronic or automatic gearbox: remove noise insulation and rotate crankshaft in clockwise direction via central bolt for vibration damper.
   
–  Determine clearance between cam and roller rocker finger.
–  Press roller rocker finger down -arrow- using a screwdriver.
If it is possible to insert a feeler gauge of 0.20 mm between camshaft and roller rocker finger:
–  Renew hydraulic compensation element: left-side → Chapter, right-side → Chapter.
  A15-1011

Valve dimensions > < Renewing valve stem oil seals with cylinder head removed