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944 Engine, Cylinder Head, Valve Drive
15
Checking and remachining valve seats
Visuel inspection
1.
Check that the valve seat sits securely in
the
cylinder head.
2.
Check the contact pattern. If the valve
does make contact over the emire
surface of the valve seat. remiII the seat
slighdy.
Remachining
1.
Valve seats can be remachined, for
example. with the Neway valve milleror
the Hunger valve seat tuming tool.
2.
Remachine the valve seats with a 45°
seat milling cutter. Then machine the seat
to the prescribed width with a 60°
correction millingcutter. A 30° correction
milling cutter is not required.
Intake seat width 1.5 mm
Exhaust seat width
1.8 mm
1/05
3. Valve seat milling cutter. e.g.
Neway 234 45°
Neway 213 60°
11862
11865
Checking and remachining valve seats
Printed in Germany - XVII, 1988
15 - 131