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Replacing valve stem seals for engine with engine identification characters BKD, AZV > < Removing and installing roller rocker arm for engine with engine identification characters BKD, AZV

Octavia Mk2

Inspecting hydraulic supporting elements for engine with engine identification characters BKD, AZV
Inspecting hydraulic supporting elements for engine with engine identification characters BKD, AZV
Special tools and workshop equipment required
t  Feeler gauges
  Note
t  The hydraulic supporting elements pressed into the roller rocker arms cannot be repaired.
t  Irregular valve noises when starting engine are normal.
Test sequence
–  Start engine and allow to run until the radiator fan starts. Increase speed to about 2500 rpm for 2 minutes and undertake a test drive if necessary.
  Note
If there are irregular valve noises which disappear after a long drive but keep reappearing on short journeys then the oil retaining valve is is defective. Fitting location: in the oil filter holder. The oil retaining valve cannot be replaced individually.
If the valves are still loud, determine which is the faulty hydraulic supporting element as follows:
–  Remove cylinder head cover → Chapter.
–  Turn the crankshaft until the cam of the hydraulic supporting element to be tested is positioned on top.
t  On vehicle with manual gearbox, push the vehicle forward in 4th gear when the ignition is switched off.
t  On vehicle with automatic gearbox, turn the crankshaft at the central bolt.
   
–  Press the roller rocker arm down with a screwdriver -arrows- and measure the play between the cams and the roller of the roller rocker arm.
If a 0.20 mm feeler gauge can be slipped between the camshafts and the roller of the roller rocker arm:
–  Replace roller rocker arm with hydaulic valve clearance compensation; to do so remove the roller rocker arm → Chapter.
  Note
t  After installing the camshafts, the engine must not be started for about 30 minutes. Roller rocker arm with hydraulic valve clearance compensation must settle (otherwise valves would strike the piston).
t  After carrying out work on the valve gear, carefully crank engine at least 2 revolutions to ensure that no valve touches the piston when the engine is started.
  S15-0436

Replacing valve stem seals for engine with engine identification characters BKD, AZV > < Removing and installing roller rocker arm for engine with engine identification characters BKD, AZV