SEAT Workshop Service and Repair Manuals

Calculate the maximum admissible re-cutting dimension –  Introduce the valve and press it hard against the seat.   Note! If the valve is replaced during the reparation, use the new valve for the measurement.

–  Measure the distance -a- between the end of the stem and the upper edge of the cylinder head. –  Calculate the maximum admissible re-cutting dimension starting with the measured distance and the minimum dimension. Minimum dimensions: Intake and exhaust valve 32.1 mm Distance measured less the minimum dimension = maximum admissible re-cutting dimension. Example:

	Measured distance	32,5 mm
-	Minimum dimension	32,1 mm
=	Max. admissible re-cutting dimension → Note	0,4 mm

1)  Max. admissible re-cutting dimension is shown in the figures as dimension “b”.

Intake valve seat: re-cutting

a	=	Ø 31,9 mm
b	=	max. admissible re-cutting dimension → Note
c	=	1,8...2,0 mm
Z	=	lower edge of the cylinder head
α	=	valve seat angle 45°
β	=	upper correction angle 30°
γ	=	lower correction angle 60°

2)  Calculation of the max. admissible re-cutting dimension → Chapter

Exhaust valve seat: re-cutting

a	=	Ø 26,6 mm
b	=	max. admissible re-cutting dimension → Note
c	=	1,8...2,0 mm
Z	=	lower edge of the cylinder head
α	=	valve seat angle 45°
β	=	upper correction angle 30°
γ	=	lower correction angle 60°

3)  Calculation of the max. admissible re-cutting dimension → Chapter