Volvo Penta 230 Workshop Manual page 54

98. Check the wear of the valve guides. Use new
valves and push up the valve 1–2 mm (0.03928–
0.07874") with the finger while the measurement is
taken. Clearance with a new valve and new valve
guide, intake: 0.030–0.060 mm (0.00118–0.002362")
and exhaust: 0.040–0.070 mm (0.0016–0.0028").
Maximum allowed clearance measured with new
valve and old valve guide is 0.15 mm (0.005906") for
intake as well as for exhaust.
Changing the valve guide
99. Heat the cylinder head in water to a temperature
of 100°C (212°F) ± 10°C. Use a drift (part no
9995218-6) to press out the valve guides. Press the
valve guides in the direction of the combustion
chamber. Check to make sure that the valve guide
has not been subject to seizing.
100. Valve guides in the standard size are available
as spare parts.
52
101. Press in new valve guides. The cylinder head
should be at room temperature. Use drift part no
9995027-1 for the intake and part no 9995028-9 for
the exhaust. Press the valve guides till the drift
touches the cylinder head. This gives the valve
guide the correct height.
IMPORTANT! The pressing force must be at
least 9000 N (900 kp) (2016 lbf). Should the
pressing force fall short the valve guide must
be removed again.
102. Clean the valve guide internally. Use reamer
part no 9995224-4. Reamer part no 9995164 can
also be used.
NOTE! The valve and the seat must be lapped to-
gether after the valve guide has been replaced.