Briggs & Stratton Twin Cylinder L-Head, Repair Manual

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7
Valve Guide Bushing Identification
See Fig. 18 to identify bushing that has been removed.
Then select correct replacement bushing shown.
Special Instructions
Two grooves on replacement bushing, #231218, go
down.
Replacement bushing #230655 or #261961 can be
installed either way.
Fig. 18 – Bushing Identification
(.366”
(9.3 mm) O.D.)
BRASS
(.367”
(9.32 mm) O.D.)
BRASS
USE
231218
(.379”
(9.63 mm) O.D.)
BRASS
(.440”
(11.18 mm) O.D.)
GRAY
(.441”
(11.2 mm) O.D.)
COPPER
USE
230655
USE
261961
USE
261961
USE
231218
Install Bushing
1. Using bushing driver, #19204, press in new
bushing until it bottoms, Fig. 19.
Fig. 19 – Install Bushing
BUSHING
DRIVER
19204
REPLACEMENT
BUSHING
Finish Reaming
NOTE: Bushing #230655 does not require finish
reaming, however it is recommended to
ensure that the entire guide is clean and
free of foreign material.
1. Finish ream guide with reamer #19233, and pilot
guide #19234, Fig. 20.
a.
Lubricate reamer with Stanisol or kerosene.
2. Ream clockwise through entire guide into valve
tappet chamber, Fig. 20.
3. Keep turning reamer clockwise when removing
reamer from guide.
a.
Flush out all chips.
Fig. 20 – Finish Ream
FINISH
REAM
THROUGH
TO VALVE
TAPPET
CHAMBER
REFACE VALVES AND SEATS
Valve faces may be resurfaced to:
Intake: 30
°
Exhaust: 45
°
See Fig. 21 for dimensions for intake and exhaust
valves.
NOTE: In most instances it is more economical to
replace the valves than to reface them.
Lap valves and seats with valve lapping tool, #19258
and valve lapping compound, Tool #94150.
Fig. 21– Valve Dimensions
SEATING AREA CENTERED
ON VALVE FACE
1/32”
MINIMUM
3/64” – 1/16”
(1.2 mm – 1.6 mm)