VW CGRA - Page 121

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– Measure distance -a- between end of valve stem and upper
edge of cylinder head.
– Calculate maximum permissible reworking dimension from
measured distance -a- and minimum dimension
Minimum dimension:
Short inlet valve mm 31.8
Long inlet valve mm 10.2
Short exhaust valve mm 31.8
Long exhaust valve mm 10.2
Measured distance minus minimum dimension = max. permissi‐
ble reworking dimension.
Example:
Measured distance 10.6 mm
- Minimum dimension 10.2 mm
= Max. permissible reworking dimension 0.4 mm
Reworking inlet valve seat.
a = 32.8 mm diameter
b = max. permissible reworking dimension
2)
c = 0.9 to 1.5 mm
d = max. ∅ 38.0 mm
r
2
= radius 2.0 mm
Z = bottom surface of cylinder head
α = 45° valve seat angle
β = 30° upper correction angle
γ = 60° lower correction angle
2) Calculating max. permissible reworking dimension ⇒ page 114 .
Reworking exhaust valve seat.
a = 29.8mm diameter
b = max. permissible reworking dimension
3)
c = 1.2 to 1.7 mm
d = max. ∅ 35.0 mm
r
2
= radius 2.0 mm
Z = bottom surface of cylinder head
α = 45° valve seat angle
β = 30° upper correction angle
γ = 60° lower correction angle
3) Calculating max. permissible reworking dimension ⇒ page 114 .
Touareg 2010 ➤ , Touareg 2015 ➤
6-cylinder direct-injection engine (3.6 l engine, 4V) - Edition 12.2019
4. Inlet and exhaust valves 115