Mercury 40 Service Manual page 226

CYLINDER HEAD
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 -
3. Install the new valve guide and circlip using a valve guide installer bushing along with
the valve guide remover.
a -
b -
4. After installing the valve guide, ream the valve guide using a valve guide reamer to ob-
tain proper stem-to-guide clearance.
a -
Page 4A-30
Valve Guide Remover (91-809495A1)
Valve Guide Remover (91-809495A1)
Valve Guide Installer Bushing (91-809496A1)
Valve Guide Reamer (91-809497A1)
a
55806
a
b
55807
a
55808
90-828631R3 MARCH 1999