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SECTION 6B
FUEL SYSTEMS
The following table lists the kits and the altitudes
above which the kits should be used.
Engine Model
Kit No.
|
Altitude
M18
52 755 74
6000 1.
M20
52 755 68
6000 ft.
High Altitude Jet Installation
1. Remove the fuel bowl retaining screw, retaining
screw gasket, fuel bowl, and bowl gasket.
NOTE:
If necessary, remove the air cleaner and
carburetor from engine to make fuel bowl
removal easier.
2. Remove the float pin, float, and fuel inlet needle.
3. Remove the existing main fuel jet.
4. Install the new high altitude main fuel Jet and
torque to 12/16 In. Ib.
5. Reinstall the fuel inlet needle, float, and float pin.
6. Install the new bowl gasket from kit and the fuel
bowl. Make sure the bowl gasket and bow! are
centered and positioned properly to ensure a
good seal.
7. Install the new bowl retaining screw gasket form
kit and the bowl retaining screw. Torque screw to
45/55 In. Ib.
8. Reinstall the carburetor and air cleaner to engine
as necessary using the new gaskets from kit.
M20 Linkage and Dampening
Spring Installation
M20 engines built between Serial No. 1619504216 and
1631600816 inclusive were built with a dampening
spring connected to the govemor arm and the bushing
in carburetor throttle lever. The dampening spring can
be eliminated by installing a new governor linkage
and new bushings as shown in Figure 6B-15. These
parts are available in Kit No. 52 755 64.
To reinstall the existing dampening spring, bushings,
and govemor linkage, use the following procedure:
1. Install the bushings and govemor linkage as
shown in Figure 6B-15.
2. Install the dampening spring to govemor arm and
bushing on carburetor throttle lever as shown in
Figure 68-16.
Make sure the end of spring with
larger hook is installed around the bushing In car-
buretor throttle lever.
Governor Arm
y^
Bushing
Bushing
Throttle Lever
On Carburetor
Figure 6B-15.
Installing Bushings And Governor
Linkage -- M20 Engines.
68.11
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