Inspecting Hydraulic Bucket Tappets - Skoda Octavia 1996 Service Manual

OCTAVIA
Edition 05.97
S00.5105.51.20
Cylinder Head/Valve Gear
Inspecting hydraulic bucket
tappets
Special tools, testers and aids required
♦ Feeler gauge
♦ Wooden or plastic wedge
Notes:
♦ Always replace a faulty bucket tappet
complete (cannot be set or repaired).
♦ Irregular valve noises when starting engine
are normal.
♦ Place a removed bucket tappet down on a
clean surface with the contact surface
(camshaft side) facing down.
♦ After installing the camshaft, it is essential
to wait about 30 minutes before starting the
engine. The hydraulic valve clearance
compensation elements have to settle
(otherwise valves will strike the pistons).
♦ After working on the valve gear, carefully
crank engine at least 2 revolutions to ensure
that no valve strikes a piston when engine is
started.
Inspection sequence
- Start engine and continue running until the
radiator fan has cut in once.
- Increase engine speed about 2500 rpm for
2 minutes; carry out a road test if necessary.
Note:
If the irregular valve noises disappear, but re-
occur always when driving short distances,
replace the oil retention valve. Fitting location
of oil retention valve: in oil filter holder ⇒ page
17-2.
If the hydraulic bucket tappets are still loud,
determine the faulty tappet as follows:
- Remove top part of intake manifold and
cylinder head cover ⇒ page 15-4 and 15-6,
respectively.
- Rotate crankshaft in clockwise direction until
the cam of the bucket tappet to be inspected
is facing up.
15
¡ ¢ £
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