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MODEL 182 & T182 SERIES SERVICE MANUAL
The heli-coil type insert (4) in the adapter may be
11-58. CARBURETOR.
replaced, although special tools are required.
Follow instructions of the tool manufacturer for
11-59. REMOVAL AND INSTALLATION.
their use. Inspect threads on adapter and in engine
a.
Place fuel selector valve in the OFF position.
for damage. Clean adapter in solvent and dry with
b.
Remove engine cowling in accordance with para-
compressed air. Ascertain that all passages in the
graph 11-3.
adapter are open and free of foreign matter.
c. Drain fuel from strainer and lines with strainer
drain control.
11-53. INSTALLATION.
d. Remove airbox in accordance with paragraph
a. Assemble adapter nut (2) and new O-ring (1)
11-64.
on adapter (3) in sequence illustrated in figure
e. Disconnect throttle and mixture controls at
11-3.
carburetor.
Note EXACT position, size and number
b. Lubricate O-ring on adapter with clean engine
of attaching washers and spacers for reference on
oil. Tighten adapter nut until O-ring is centered
reinstallation.
in its groove on the adapter.
f.
Disconnect and cap or plug fuel line at carbure-
c. Apply anti-seize compound sparingly to the
tor.
adapter threads, then simultaneously screw adapter
g. Remove safety wire, nuts and washers attaching
and adapter nut into engine until O-ring seats against
carburetor to intake manifold and remove carburetor
engine boss without turning adapter nut (2).
Rotate
and mounting gasket.
adapter to approximate angular position noted during
h. Reverse the preceding steps for reinstallation.
removal.
Do not tighten adapter nut at this time.
Use new gaskets when installing carburetor. Rig
d. Temporarily install filter assembly on adapter,
controls in accordance with paragraphs 11-84, 11-85,
and position so adequate clearance with adjacent
and 11-86. (Check carburetor throttle arm to idle stop
parts is attained.
Maintaining this position of the
arm attachment for security and proper safetying at
adapter, tighten adapter nut to 600 to 700 in-lb and
each normal engine inspection in accordance with fig-
safety. Use a torque wrench, extension and adapter
ure 11-7.)
as necessary when tightening adapter nut.
e. Install filter assembly as outlined in paragraph
11-60. IDLE SPEED AND MIXTURE ADJUSTMENTS.
11-49. Be sure to service the engine oil system.
Idle speed and mixture adjustment should be accom-
plished after the engine has been warmed up. Since
idle RPM may be affected by idle mixture adjustment,
it may be necessary to readjust idle RPM after set-
11-54. OIL COOLER.
ting the idle mixture correctly.
a. Set the throttle stop screw (idle RPM) to obtain
11-55. DESCRIPTION.
A non-congealing oil cooler
600±25 RPM, with throttle control pulled full out
may be installed on the aircraft. The cooler is
against idle stop.
mounted on the right forward side of the engine crank-
case directly in front of number five cylinder and has
NOTE
no external oil lines. Ram air passes through the oil
cooler and is discharged into the engine compartment.
Engine idle speed may vary among different
Oil circulating through the engine is allowed to circu-
engines. An engine should idle smoothly,
late continuously through warm-up passages to pre-
without excessive vibration and the idle speed
vent the oil from congealing when operating in low
should be high enough to maintain idling oil
temperatures. On the standard and non-congealing
pressure and to preclude any possibility of
oil coolers, as the oil increases to a certain tempera-
engine stoppage in flight when the throttle is
ture, the thermostat valve closes, causing the oil to
closed.
be routed to all of the cooler passages for cooling.
Oil returning to the engine from the cooler is routed
b. Advance throttle to increase engine speed to
through the internally drilled oil passages.
approximately 1000 RPM
c. Pull mixture control knob slowly and steadily
11-56.
ENGINE FUEL SYSTEM.
toward the idle cut-off position, observing tacho-
meter, then return control full IN (RICH) position
11-57. DESCRIPTION. The engine is equipped with
before engine stops.
a carburetor mounted at the lower side of the engine.
d. Adjust mixture adjusting screw at upper end of
The carburetor is of the plain-tube fixed-jet type and
carburetor intake throat to obtain a slight and
has such features as an enclosed accelerating pump
mentary gain of 25 RPM maximum at 1000 RPM en-
mechanism, simplified fuel passages to prevent vapor
gine speed as mixture control is moved from full IN
locking, idle cut-off to prevent starting of the engine
(RICH) toward idle cut-off position. Return control
accidentally and manual mixture control for leaning.
to full IN (RICH) to prevent engine stoppage.
For overhaul and repair of the carburetor, refer to
e. If mixture is set too LEAN, engine speed will
the manufacturer's overhaul and repair manual.
drop immediately, thus requiring a richer mixture.
11-22
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Troubleshooting
