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Renewing valve stem oil seals with cylinder head installed > < Removing and installing camshafts

A1

Checking hydraulic valve compensation elements
Checking hydraulic valve compensation elements
  Note
t  The hydraulic compensation elements cannot be serviced.
t  Irregular valve noises when starting engine are normal.
Special tools and workshop equipment required
t  Plastic wedge
t  Feeler gauge
Procedure
–  Start engine and run until radiator fan has started up once.
–  Increase engine speed to approx. 2500 rpm for 2 minutes (perform road test if necessary).
  Note
If irregular valve noise disappears but repeatedly re-occurs when travelling short distances, renew oil filter bracket → Item with integrated oil retention valve.
–  If the compensation elements are still noisy, locate the defective compensation element as follows:
–  Remove cylinder head cover → Chapter.
–  Rotate crankshaft by turning bolt for toothed belt sprocket until cam of supporting element to be tested is facing upwards.
   
–  Press roller rocker finger down -arrow- with a plastic wedge to determine clearance between cam and roller rocker finger.
–  If it is possible to insert a feeler gauge of 0.20 mm between cam and roller rocker finger, renew hydraulic compensation element → Chapter „Removing and installing camshafts“.
Additional steps required
–  Install cylinder head cover → Chapter.
  A15-1011

Renewing valve stem oil seals with cylinder head installed > < Removing and installing camshafts