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Checking valve guides >
< Renewing valve stem oil seals
A4 Mk1
Power unit
4-cylinder engine (2-valve, roller rocker fingers), mechanics
Engine cylinder head, valve gear
Servicing valve gear
Valve dimensions
Valve dimensions
Valve dimensions
Note
Inlet and exhaust valves must not be machined. Only grinding-in is permitted.
Dimension
Inlet valve
Exhaust valve
Ø a
mm
39.5 ± 0.15
32.9 ± 0.15
Ø b
mm
5.980 ± 0.007
5.965 ± 0.007
c
mm
93.85
93.85
α
∠°
45
45
Power unit
4-cylinder engine (2-valve, roller rocker fingers), mechanics
Engine cylinder head, valve gear
Servicing valve gear
Valve dimensions
Checking valve guides >
< Renewing valve stem oil seals
Note