(b) Secure plunger in housing with snap
(c) Install cover (4) with lockwashers (3)
and screws (2).
(24) Throttle Shaft Replacement.
(a) Lubricate new O-ring (24, figure 13-20)
and slide on fuel adjusting screw (23).
(b) Insert fuel adjusting screw (23) into
throttle shaft (27) about six turns. Do
not restrict throttle shaft fuel port.
(c) Lubricate new O-ring (26) and slide on
throttle shaft (27).
(d) Insert throttle shaft (27) in housing (50)
with throttle stop up.
(e) Replace ball (21), cover (20), screws
(19), lever (18), screw (17), washer (16),
lockwasher (15), and nut (14).
(25) Filter Screen Replacement.
(a) Install fuel filter screen assembly (13,
figure 13-20) in housing (50).
(b) Install filter spring (12), cap seal ring
(11), and filter screen cap (10).
(26) Remove filter screen cap (9, figure 13-21),
cap seal ring (11), filter spring (10), and
fuel filter screen assembly (13).
(27) Remove spring (25), shim (26), plunger
(27) and plunger assembly (28).
(28) Heat housing in oven to 300°F (149C) and
press out governor sleeve and barrel (35,
(29) Remove three screws (2), fuel control
cover (3), snap ring (5), and barrel plug (8).
(30) Remove and discard O-rings (5 and 6).
(31) Remove two screws (37), and throttle shaft
Use extreme care when removing throttle
shaft cover (38) to avoid dropping ball
(32) Remove ball (39), unscrew fuel adjusting
screw (44), and remove and discard O-ring
(33) Remove snap ring (47), throttle shaft (43),
and discard O-ring (46).
(34) Visually inspect throttle shaft (43) and fuel
adjusting screw (44) for signs of wear or
damage; replace if necessary.
Do not attempt to remove the throttle
shaft sleeve; it is honed to size after
assembly to housing and due to close
tolerances, the housing and sleeve must
(35) Visually inspect filter screen assembly (13)
for holes or imbedded metal particles in
mesh. Replace if damaged, otherwise,
clean in fuel oil and dry with compressed
(36) Check drive shaft bushing (23) for signs of
seizure or burrs. Replace if damaged.
(37) Check drive shaft bushing (23), ID with
inside micrometers; if worn beyond 0.7525
inch (19.11 mm) replace bushing as
(a) Remove worn bushing using a gouge
chisel or half inch pipe tap. After
tapping bushing, screw a half inch pipe