Volvo Penta 230, Workshop Manual

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The valve seat
103.
IMPORTANT! Always replace the valve guides
prior to removing the valve seat.
Grind two recesses in the old valve seat ring. These
recesses will reduce the tension in the seat ring.
Then grind a cut in the seat ring (in order to provide
a hold for the chisel) Make sure not to damage the
cylinder head!
105. Knock out the valve seat with a long drift
through intake port the cylinder head.
106. Check the position of the valve seat. Should the
seat location be damaged, it has to be reamed
(milled) to the closest oversize. Then measure the
valve seat diameter. Use an internal micrometer.
104. Crack the valve seat with a chisel. Use the
chisel with extreme caution.