Skoda Workshop Service and Repair Manuals

Valve gear - Summary of components

1 -

10 Nm

q	only on engines with identification characters BUD

2 -	Protective cover

q	only on engines with identification characters BUD

3 -

Guide

q	for engines BBY, BBZ, BKY, BUD

q	for engines AUA, AUB ignition cable guide → Chapter

q	tighten at camshaft housing to 8 Nm

4 -	20 Nm + torque a further 1/4 turn (90°)

q

replace

q	to release and tighten use camshaft lock -T10016- → Fig.

5 -	Camshaft sprocket

q	Pay attention to position of toothed belt when installing → Chapter

6 -	Sealing ring

q	only replace with the camshaft installed

q	Lightly oil sealing lip

q	replace → Chapter

7 -	Coupling drive - toothed belt

q	before removing mark running direction

q	check for wear

q	do not kink

q	removing and installing, tensioning → Chapter

8 -	10 Nm + torque a further 1/4 turn (90°)

q

replace

q	tighten from inside to outside

9 -	Camshaft housing

q	for engines BKY, BUD with Hall sender -G40- → Chapter

q	removing and installing → Chapter

q	when installing, fit onto stud bolts and dowel pins vertically from above.

10 -

Screw cap

11 -

10 Nm

12 -	Roller rocker arm

q	Check smooth operation of cylindrical-roller bearings

q	oil contact surface

q	for installing, secure locking clip onto hydraulic balancing element

13 -

Collets

14 -

Screw cap

15 -

20 Nm

16 -	Lifting eye

17 -	Non-return valve, 6 Nm

q	Clean thread and install with sealant -D 154 102 A1-

q	do not tighten excessively as the valve may tilt

18 -	Hydraulic balancing element

q	do not interchange

q	with hydraulic valve clearance compensation

q	oil contact surface

q	before installing check axial play of the camshafts → Fig.

19 -	Valve spring retainer

20 -	Valve spring

q	removing and installing with blank holder for valve spring -MP1-229 (3362)-

21 -	Valve stem seal

q	replace → Chapter

22 -	Valve guide

q	check → Chapter

23 -	Oil pressure switch -F1-, 25 Nm

q	Switching pressure 0.03 ... 0.07 MPa (0.3 ... 0.7 bar)

q	check → Chapter

q	Cut open gasket ring if leaking and replace

24 -

Valves

q	do not rework, only grinding in is permissible

q	Valve dimensions → Fig.

25 -	Cylinder head

q	reworking valve seats → Chapter

q	reworking sealing surface → Fig.

26 -

20 Nm

27 -	Coupling drive tensioning pulley

q	check → Chapter

q	Tensioning toothed belt → Chapter

28 -	Screw plug, 45 Nm

q	install with sealant -D 154 102 A1-

q	must not be screwed in too deep

q	maximum permissible countersink of the camshaft housing contact surface: 2 mm

29 -

Camshafts

q	Inspecting axial play → Fig.

q	oil before assembly

q	after installation replace gasket rings → Chapter

30 -

O-ring

q

replace

q	moisten with oil before inserting

Locking both camshaft sprockets with the camshaft lock -T10016- –  Insert the two locking pins through the locating holes of the camshaft sprockets up to the stop in the fit holes in the camshaft housing.   Note The two locking pins are correctly inserted if the end parts -D- are flush with line -A-. –  Slide the support -B- up to the stop on the inlet camshaft timing gear -C-. –  If both camshaft sprockets are locked in the fit holes, it is possible to slacken or screw them down.

Checking the axial play of the camshaft Special tools and workshop equipment required t  Universal dial gauge holder -MP3-447 (VW 387)- t  Dial gauge Carry out measurement with the camshaft housing removed and the end covers installed → Item and → Item. Wear limit: max. 0.40 mm.

Valve dimensions   Note Valves must not be reworked. Only grinding in with grinding paste in the valve seat is permissible.

Dimension		Inlet valve	Exhaust valve
Ø a	mm	29,5	26,0
Ø b	mm	5,973	5,953
c	mm	100,9	100,5
α	∠°	45	45

Rework the lower cylinder head sealing surface Permissible reworking dimension of cylinder head: a = at least 108.25 mm.