Porsche 928 Workshop Manual page 237

928
Engine/Cylinder Head, Valve Drive
15
3.Install valve and hold against
valve seat. Once installed, the
Valve spring
end of the valve stem should be
between the end of the upper edge
and the offset surface of the
special tool. If the valve stem
Free length
protrudes beyond the upper edge
of the special tool, install
Outer spring
shims to take up the excess.
Wire dia.
0.5 nnn thick shims are available.
Outer spring
Inner spring
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4.Do not mix up the valves after
adjustment.
85 models
40.00 mm
4.1 mm
2.9 mm
86/86
models
43.5 mm
3.6 mm
2.7 mm
Printed in
Germany-XIII,
1986 Checking and Adjusting Installation 15 -
116a
Length of Valve Springs