Skoda Workshop Service and Repair Manuals

Repairing Valve Gear   Note Cylinder heads with cracks between the valve seats or between a valve seat ring and the spark plug thread may continue to be used without any reduction in life provided these are slight initial cracks which are not more than 0.5 mm wide, or cracks exist only at the first few turns of the spark plug thread. 1 -  10 Nm 2 -  6 Nm + torque a further 1/4 turn (90°) 3 -  Bearing caps –  Observe the fitting position and the order of fitting → Chapter –  Coat head contact surface of bearing caps 1 and 5 with -D 454 300 A2- sealant 4 -  Camshaft –  inspecting axial play → Fig. –  removing and installing → Chapter –  Identification and timing → Fig. 5 -  Bucket tappets –  do not interchange –  with hydraulic valve clearance compensation –  check → Chapter –  lay aside with contact surface facing down –  before installing check axial play of the camshaft → Fig. –  oil contact surfaces 6 -  Collets 7 -  Valve spring retainer 8 -  Valve spring –  removing and installing –  with cylinder head removed: with -MP 1-211- and -MP 1-213- with valve supporting plate -MP 1-218- –  with cylinder head installed: → Chapter 9 -  Valve guide with collar –  repair 10 -  Valve stem seal –  replace → Chapter 11 -  Valve guide –  check → Chapter –  replace → Chapter 12 -  Gasket ring –  lightly oil the sealing lips of the gasket ring –  replace → Chapter 13 -  Cylinder head –  reworking valve seats → Chapter –  reworking sealing surface → Fig. 14 -  Valves –  do not rework, only grinding in is permissible –  Valve dimensions → Fig. 15 -  20 Nm 16 -  Lifting eye

Reworking cylinder head sealing surface Reworking dimension of cylinder head:    a = at least 135,6 mm   Note If the sealing surface is reworked, the valves should be set lower by the same amount (rework valve seat rings) otherwise the valves will strike the pistons. When doing this, ensure that the permissible minimum dimension is not exceeded → Chapter.

Checking the axial play of the camshaft Special tools and workshop equipment required t  Universal dial gauge holder -MP 3-447- t  Dial gauge Wear limit: max. 0,15 mm –  Place the cylinder head on a level metal plate and attach universal dial gauge holder -MP 3-447-. –  Take measurements with the bucket tappets removed and bearing cap 3 mounted -arrow-.

Camshaft identification, timing Identification Between the inlet and outlet cams for cylinder 3 “032S” is marked -arrow-. Timing for 1 mm valve stroke (032S)

Inlet valve opens	7.5° after TDC
Inlet valve closes	31.5° after BDC
Exhaust valve opens	32.5° before BDC
Exhaust valve closes	8.5°before TDC

Valve dimensions   Note Valves must not be reworked. Only grinding in is permissible.

Dimension		Inlet valve	Outlet valve
Ø a	mm	35,6	29,0
Ø b	mm	6,963	6,943
c	mm	94,8	95,0
α	∠°	45	45