Cessna 188 Series Service Manual page 199

NOTE and reconnect all lines and hoses to valve.
1. Inspect installation and install cowling.
If the valve attached to the diaphragm is
stuck in the bore of the body, grasp the
11A-44. INSTALLATION.
center nut, rotate and lift at the same
a. Secure the fuel manifold to the crankcase with
time to work gently out of the body.
two crankcase bolts.
b.
Connect the fuel lines and the six fuel injection
CAUTION lines. Inspect completed installation.
Do not attempt to remove needle or spring
llA-45.
FUEL DISCHARGE NOZZLES.
From the
from inside plunger valve.
Removal of
fuel manifold valve, individual, identical size and
these items from the valve will disturb the
length fuel lines carry metered fuel to the fuel dis-
calibration of the valve.
charge nozzles located in the cylinder heads.
The
outlet of each nozzle is directed into the intake port
d. Using clean gasoline, flush out the chamber be-
of each cylinder.
The nozzle body contains a drilled
low the screen. central passage with a counterbore at each end.
The
e. Flush above the screen and inside the center
lower end is used as a chamber for fuel-air mixture
bore making sure that outlet passages are open.
Use before the spray leaves the nozzle.
The upper bore
only a gentle stream of compressed air to remove
contains an orifice for calibrating the nozzles.
Near
dust and dirt and to dry.
the top, radial holes connect the upper counterbore
with the outside of the nozzle body for air admission.
CAUTION
These radial holes enter the counterbore above the
orifice and draw outside air through a cylindrical
The filter screen is a tight fit in the body and
screen fitted over the nozzle body. This screen pre-
may be damaged if removal is attempted.
It vents dirt and foreign material from entering the
should be removed only if a new screen is to
nozzle. A press-fit shield is mounted on the nozzle
be installed,
body and extends over the greater part of the filter
screen, leaving a small opening at the bottom of the
f. Clean diaphragm, valve and top cover in the
shield. This provides an air bleed into the nozzle
same manner.
Be sure the vent hole in the top cover
which aids in vaporizing the fuel by breaking the high
is open and clean.
vacuum in the intake manifold at idle rpm and keeps
g. Carefully replace diaphragm and valve.
Check
the fuel lines filled. The nozzles are calibrated in
that valve works freely in body bore.
several ranges. All nozzles furnished for one engine
h.
Position diaphragm so that horizontal hole in
are the same range and are identified by a number
plunger valve is 90 degrees from the fuel inlet port
and a suffix letter stamped on the flat portion of the
in the valve body.
nozzle body.
When replacing a fuel discharge nozzle
i. Place upper spring in position on diaphragm.
be sure it is of the same calibrated range as the rest
j. Place cover in position so that vent hole in
of the nozzles in the engine.
When a complete set of
cover is 90 degrees from inlet port in valve body.
nozzles is being installed, the number must be the
Install cover attaching screws and tighten to 20±1
same as the one removed, but the suffix letters may
lb-in. Install safety wire on cover screws,
be different, as long as they are the same for all
k. Install fuel manifold valve assembly on engine
nozzles being installed on a particular engine.
11A-15