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Valve Guide and Valve Stems
Measure valve stem and valve guide.
The valve guide wears more rapidly at its ends than
at any other location. Measure the inside diameter of
the guide at its ends in two directions. If the service
limit is exceeded, replace the guide.
Valve stem diameter, mm [in]
Normal Value ............ Ø10 [0.39]
Assembly Standard ... 9.940–9.960 [0.39134–0.39213]
Service limit .............. 9.910 [0.39016]
Valve guide inside diameter, mm [in]
Normal Value ............ Ø10 [0.39]
Assembly Standard ... 10.000–10.015 [0.39370–0.39429]
Service limit .............. 10.060 [0.39606]
Replacing valve guides and stem seals
1. Use the Valve guide remover to remove the valve
guide for replacement.
2. Use the Valve guide seal installer to install slowly
a new guide with a press.
IMPORTANT! The installation depth for the
valve guide is specified, so use the Valve guide
seal installer to secure the correct depth.
IMPORTANT! Do not apply any oil or sealant to
the surface of the stem seal that comes in con-
tact with the valve guide. When installing the
stem seal, apply lub oil to valve stem to ensure
initial lubrication of the stem seal lip.
IMPORTANT! Use a new stem seal whenever
removed.
Group 21 Engine Body
81
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