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Checking valves > < Replacing valve shaft seals.

Leon Mk2

Checking hydraulic tappets
Checking hydraulic tappets
Special tools and workshop equipment required
t  Calibre
t  Plastic or wooden wedge
Checking sequence
  Note
t  The hydraulic cam followers may 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 cam followers continue to make noise, find the faulty follower in the following way:
–  Remove cylinder head cover → Chapter
–  Turn crankshaft until cams of bucket tappets to be checked are pointing upwards.
t  Vehicles with manual gearbox: Push the vehicle with the fourth gear engaged, with the ignition off.
   
–  Push bucket tappet down with a wooden or plastic wedge to determine play between cam and bucket tappet.
If it is possible to insert a feeler gauge of 0.20 mm between camshaft and bucket tappet:
–  Replacing the tappet → Chapter „Camshafts and camshaft adjuster: Removing and installing“.
  Note
t  After installing camshafts, 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.
  V15-0880

Checking valves > < Replacing valve shaft seals.