Volvo Penta 230, Workshop Manual

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153. Use a cutter to clean the valve seats. Remove
carbon deposits from the combustion chambers and
the valves. Check the valves for cracks and other
possible damages. Replace if necessary.
154. Check the wear in the valve guides. Use new
valves and push up the valves 1–2 mm (0.0394–
0.0787"), hold while measuring. Clearance with new
valve and new valve guide, intake: 0.030–0.060 mm
(0.00118–0.00236"), exhaust: 0.040–0.070 mm
(0.00157–0.00276"). Maximum clearance allowed
with new valve and old valve guide is 0.15 mm
(0.0059") for intake as well as for exhaust.
155. Place the cylinder head in special tool part no
884979-6 and hold it with 2 screws (M12).
156. Use special tool part no 884959-0 to start
pressing out the valve guide. Press until the tool bot-
toms.
Changing the valve guides
157. Change over to special tool part no 884958-0
and press until the tool bottoms.