Cessna 188 Series Service Manual page 179

MODEL 188 & T188 SERIES SERVICE MANUAL
NOTE
b. Loosen clamp securing control to engine.
c. Shift control housing in its clamp so that the
Some controls have intricate parts that will mixture arm on the carburetor is full open (FULL
fall out and possibly be lost if the control is RICH). Tighten the clamp in this position.
pulled from the housing while the control is d. Unlock and pull control full OUT. Check that
disconnected. mixture arm on carburetor is full closed (IDLE CUT-
OFF).
11-66. RIGGING. When adjusting any engine control,
e. Check that the bolt and nut at the mixture arm
it is important to check that the control slides smooth- on the carburetor secures the control wire and that
ly throughout its full range of travel, that it locks se-
the bolt will swivel in the arm.
curely if equipped with a locking device and that the f. Bend the wire tip 90 degrees to prevent wire
arm or lever it operates moves through its full arc of from being withdrawn if the locking nut should be-
travel. come loose.
CAUTION
NOTE
Whenever engine controls are being discon-
When installing a new control, it may be
nected, pay particular attention to the exact
necessary to shorten the wire and/or
position, size and number of attaching washers
housing. The mixture arm on the car-
and spacers. Be sure to install attaching parts
buretor must contact the stops in each
as noted when connecting controls. direction and the control should have
approximately 1/8-inch cushion when
11-67. THROTTLE CONTROL.
pushed full in.
a. Disconnect throttle control rod end from throttle
arm on carburetor. Note EXACT position and size of *Refer to the inspection chart in Section 2
bolt and washers for reference on reinstallation. for inspection, lubrication and/or replace-
b. In the cockpit, move throttle control lever full
ment interval for the mixture control.
forward, then pull lever aft approximately 1/8-inch
from full forward for cushion and tighten friction con- 11-69. PROPELLER CONTROL. Refer to Section
trol knob on quadrant to prevent movement of lever. 13 for rigging propeller and governor control.
c. Move throttle control arm on the carburetor to
full OPEN position (against stop), adjust rod end on 11-70. CARBURETOR HEAT CONTROL.
throttle control to align with arm and install attaching
a. Loosen clamp securing control to the bracket
bolt and washers.
on airbox.
d.
Release friction lock and check for full travel of
b. Push control full in, then pull it out approxi-
arm on carburetor.
mately 1/8 inch from panel for cushion.
c. Shift control housing in its clamp so that the
NOTE valve in the airbox is seated in the full open position.
Tighten clamp in this position.
The result of rigging, in all cases, is the d. Pull out on the control and check that the air
throttle control must be rigged so that the valve inside the airbox seats in the opposite direction.
control arm on the carburetor contacts the
e. Check that the bolt and nut on the air valve lever
mechanical stops in both directions, that
secures the control wire and that the bolt will swivel
the throttle lever has approximately 1/8- in the lever.
inch cushion at the control quadrant when f.
Bend the wire tip 90 degrees to prevent it from
in full OPEN position and that the small
being withdrawn if the attaching nut should become
retaining ring on some controls, contacts
loose.
the end of the control housing at the same
time the idle stop is reached. NOTE
* Refer to the inspection chart in Section 2 When installing a new control, it may be nec-
for inspection, lubrication and/or replace- essary to shorten the wire and/or control
ment interval for the throttle control, housing. The air valve must seat in both
positions and the control should have approxi-
11-68. MIXTURE CONTROL.
mately 1/8 inch cushion at the instrument panel
a.
Push mixture control full IN, unlock and pull
when pushed full in.
control OUT approximately 1/8-inch for cushion.
* Refer to the inspection chart in Section 2
for inspection, lubrication and/or replace-
ment for the carburetor heat control.
11-23