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Valve dimensions > < Replacing valve shaft seals.

Leon Mk1

Support elements with hydraulic compensation: verification
Support elements with hydraulic compensation: verification
Special tools and workshop equipment required
t  Calibre
Checking sequence
  Note
t  Support elements with hydraulic compensation can not be repaired.
t  Irregular valve noise during starting is normal.
–  Start engine and let it run until the radiator fan has switched on once.
–  Increase engine speed to about 2500 rpm for 2 minutes: if necessary, perform road test.
  Note
If the irregular valve noises stop but recur repeatedly during short trips, renew the oil retention valve. Installation location of oil retention valve: in the oil filter bracket → Item.
If the hydraulic compensation elements are still noisy, determine the defective element as follows:
–  Remove cylinder head cover → Chapter
–  Turn crankshaft until the cams for the support element to be checked stand on the top. To do this move the vehicle forwards in 4th gear with ignition switched off.
   
–  Determine clearance between cam and roller rocker finger.
–  Push roller rocker finger with screwdriver downwards -arrow-.
If an 0.20 mm feeler gauge can be inserted between camshaft and roller rocker finger:
–  Replace the support element → Chapter.
  Note
t  After installing the camshaft wait for approx. 30 minutes before starting engine. The hydraulic elements should be allowed to sit in place (if not, the valves may press on the cylinder).
t  After working on the valve gear, turn the engine carefully at least 2 rotations to ensure that none of the valves make contact when the starter is operated.
  A15-0926

Valve dimensions > < Replacing valve shaft seals.