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Mercury 40 FourStroke - Valve Guide Replacement

Mercury 40 FourStroke
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CYLINDER HEAD
90-857046R1 NOVEMBER 2001 Page 4A-31
Valve Guide Replacement
1. Heat the cylinder head in an oven to 390° F (200°C). This will help to ease guide removal
and installation and to maintain correct interference fit.
2. Remove the valve guide using a valve guide remover.
a
a-Valve Guide Remover (91-809495A1)
3. Install the new valve guide and circlip using a valve guide installer bushing along with
the valve guide remover.
a
b
a-Valve Guide Remover (91-809495A1)
b-Valve Guide Installer Bushing (91-809496A1)
4. After installing the valve guide, ream the valve guide using a valve guide reamer to ob-
tain proper stem-to-guide clearance.
a
a-Valve Guide Reamer (91-809497A1)

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