SECTION C5
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VALVE GUIDE RENEWAL
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The cast iron valve guides are a tight
interference fit in the cylinder head and can be
removed and refitted only after heating the
cylinder head to a temperature of 150° to
200°C. A special Service Tool 063964 is
available for removing and refitting the valve
guides.
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Proceed as follows:
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1
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Place the tool adaptor marked "Remover" hollow
end down over the valve guide.
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2
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Place the cranked and threaded stem through the
valve guide from the hemisphere.
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3
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Hold the cranked stem to prevent it turning and
scrow on the handie (see Fig. C6). As the handie is
tightened the guide and cranked stem will be pulled
through into the remover body.
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New valve guides are available in oversizes of
+0.002 in., +0.005 in., +0.010 in. and +0.015 in.
The valve guide to cylinder head interference
shouid be .0015 in. -.0025 in. and if there is
ovality and oversize guides are to be fitted the
valve guide bores in the head must be reamed
tosuit.Asamatterof course usethe improved inlet
guides with valve guide-to-stem seals during
reassembly.
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Fit new valve guides as follows:
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4
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Place the new guide in line with the bore in the
cylinder and place the adaptor marked "Replacer"
from Service Tool 063964 over the guide.
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5
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Place the replacer stem through the cylinder
head and bore of the valve guide and locate the
abutment to the valve seat.
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6
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Fit the handie and turn to pull the guide fully
home into the head. If necessary the abutment can
be prevented from turning by the use of a suitable
key in the socket provided.
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7
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Recut the valve seats at the points where new
guides have been fitted. This operation is des
cribed in Section C6.
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