Dismantling and assembling valve gear — VW

ACD
Valves
Reworking inlet valves => fig.
7
Lapping => fig.
8
Adjusting valve play=> page
15-20
.
Installing valve caps => fig.
5

Valve guides
Checking and renewing => Page
15-14

Cylinder head
Removing and installing => page
15-2
, fig.
1
. and
2
Reworking valve seats => page
15-11
For exchange heads with reworked cylinder mountings there are used compesation rings of a thickness of 1 mm between cylinder and cylinder head

Nut
Observe sequence when tightening => Page
15-2
, fig.
1
and
2

Oil deflector ring
For inlet valves only
Renew.

Valve spring
Small windings to the cylinder head
Removing and installing => fig.
3
. and
4

Valve cotters
Adapt when play is too excessive

Oil seal
Sealing ring and corresponding groove in cylinder head gradually discontinued
If there is a groove in the cylinder head, always renew sealing ring

Hexagon nut, M8
Coppered
25 Nm (2.5 mkg)

Rocker
Check for wear

Mounting piece
Groove shows upwards => fig.
2

Spring washer
Thrust washer
Protective tube
weld shows upwards
Pretension => fig.
1

Oil seal
Renew.

Tappet push rod
Check for distortion between two mountings
Run-out: max. 0.3 mm

Fig.1
Pretension protective tube

Dimension -a-: approx. 190 mm.

Telescope tappet protective tubes -113 109 337- as spare part

The telescope tappet protective tube -113 109 337-is available as spare part

With this tappet protective tube damaged or leaking tubes may be changed in all 34 to 50 HP-engines without removing the engine.

Installation sequence

Take cylinder head cover off, remove rocker shaft and pull tappet push rod off.
Press defective tappet protective tube off with screwdriver.
Press telescope tappet protective tube (with new seals) together and install so that the thin end shows to the cylinder head.
Insert tappet push rod, install rocker shaft, adjust valve play and fit cylinder head.

Fig.2
Install mounting piece

Groove shows upwards -arrows-.

Fig.3
Removing and installing valve spring with disassembled engine

Fig.4
Removing and installing valve spring with installed engine

Remove rocker shaft with rocker and sealing rings.
Install valve spring spanner VW 653/2 (self-made) instead of rocker shaft.
Srew pressure hose for valve spring spanner into the spark plug thread. Give pressure, max. 6 atmosphere above atmospheric pressure.
Press on valve spring plate.
Take valve cotters, spring plates and valve spring off.

Fig.5
Install valve caps

Valves with stamped shaft end can be serviced with valve caps (spare part no. 113 109 621).

The cap is placed on the shaft end of the valves -arrow- before installing the rocker and must not be secured.

Fig. 6
Valve dimensions

Inlet valve

a -
33 mm
b -
7.94 - 7.95 mm
c -
112 mm
α -
44°

Outlet valve

a -
30.1 mm
b -
8.91 - 8.92 mm
c -
112 mm
α -
45°

Fig.7
Reworking inlet valves

When reworking valves the dimension must not be less than -d- = 0.5 mm.

Note:

Outlet valves must not be finished off. Only lapping-in is permitted => fig.
8
.

Fig.8
Lapping valves

Lap by raising and turning the valves evenly.