944 S L4-2479cc 2.5L DOHC (1987)
Valve Seat: Testing and Inspection
Checking the Valve Seat Wear Limit
Checking the valve seat wear limit
1.
The valve seats in the 4-valve cylinder heads can he remachined. At the same time, the wear limit dimension must not be exceeded as this would
mean that the hydraulic valve tappets may no longer function correctly.
Wear dimension
Intake valve 44.4 mm
Exhaust valve 43.4 mm
2.
This is measured with the valve to be installed, from the end of the valve shaft to the contact area of the valve spring support in the cylinder head.
3.
The valve must be held firmly on the valve seat for measurement.