Cessna T188C - Description; 11-39. Remote Engine Oil Drain System; Oil Cooler; Engine Fuel System

MODEL 188 & T188 SERIES SERVICE MANUAL
NOTE Oil circulating through the engine is allowed to circu-
late continuously
through warm-up
passages
to pre-
A
special wrench
adapter for adapter
nut (2)
vent
the oil from congealing
when
operating in low
(Part No. SE-709) is available from the temperatures. On the standard and non-congealing
Cessna
Supply Division, or one may
be fabri- oil coolers,
as the oil increases to a certain
tempera-
cated as shown in figure 11-4.
Remove any ture,
the thermostat valve closes,
causing the oil to
engine
accessory that interferes
with removal be routed
to all of the cooler passages
for cooling.
of the adapter.
Oil returning
to the engine from the cooler
is routed
through
the internally
drilled
oil passages.
c. Unscrew adapter and remove from engine. Dis-
card adapter O-ring.
11-39. REMOTE ENGINE
OIL DRAIN SYSTEM. A
remote
engine oil
drain system
may be installed.
11-36. DISASSEMBLY, INSPECTION AND ASSEM- Draining of the oil is usually performed after an en-
BLY. Figure 11-3 shows the relative position of the gine shut-down while the oil is still hot. The follow-
internal parts of the filter adapter
and may be used
ing chart will give the approximate
oil temperature
as a guide during installation of parts. The bypass and time required to drain 10 quarts of oil from the
and outlet valves are to be installed as complete engine.
units, with the valves being staked three places.
The detail parts which
form the isolation valve may
OIL TEMP. TIME
REQUIRED TO DRAIN
be replaced individually. Also use new seals, lubri- 87°F 70 Minutes
cate parts
with engine oil and replace
any part that
147*F 11.4
Minutes
shows signs of
excessive wear. Note that
washer (6) 186°F
6.9 Minutes
is installed with its countersunk side toward outlet
valve (3).
Tighten
plug (12) to a
maximum of
.40
11-40. ENGINE
FUEL SYSTEM.
inch as shown in figure 11-3. The hell-coil type in-
sert (14) in the adapter
may be replaced, although
11-41. DESCRIPTION.
The engine is equipped with
special tools are required.
Follow instructions a
carburetor mounted at the lower
side of the engine.
of the
tool manufacturer for their use.
If the isola- The carburetor
is of the plain-tube fixed-jet
type and
tion valve should become defective, remove plug (12) has such features as an enclosed accelerating pump
and
parts (6 through 11). Weld shut
vent hole in plug mechanism,
simplified fuel passages to
prevent vapor
(12). Reinstall washer (6), sleeve (7), O-ring (8) locking, idle cut-off to prevent starting of the engine
and plug (12) in the adapter. Inspect threads on adap- accidentally and manual mixture control for leaning.
ter and in engine for damage.
Clean adapter in sol-
For overhaul and repair
of the carburetor, refer to
vent and dry with compressed
air. Ascertain that all the
manufacturer's overhaul and repair
manual.
passages in the adapter are open and free of foreign
material. Also, check that bypass and outlet valves 11-42. CARBURETOR REMOVAL AND INSTALLA-
are seated properly. TION.
a. Place fuel shut-off valve in the OFF position.
11-37. ADAPTER INSTALLATION.
b. Remove engine cowling
in accordance with
a. Assembly adapter nut (2) and new O-ring (1) on paragraph 11-3.
adapter (5) in sequence illustrated in figure 11-3. c. Drain fuel from strainer and lines with strainer
b. Lubricate O-ring on adapter with clean engine drain control.
oil.
Tighten adapter nut until O-ring
is centered in d.
Remove airbox in accordance
with paragraph
its groove on the adapter. 11-48.
c. Apply an anti-seize compound sparingly to the e. Disconnect throttle and mixture control to con-
adapter threads,
then simultaneously screw
adapter trol arms
on carburetor. Note position,
size and
and adapter nut into engine until O-ring seats against number of washers and spacers so that they may be
engine boss without turning adapter nut (2). Rotate reinstalled in the same manner.
adapter
to approximate angular position
noted during f. Disconnect
and cap or plug fuel line
at carbure-
removal. Do not tighten adapter nut at this time. tor.
d. Temporarily install filter assembly on adapter, g. Remove nuts and washers attaching carburetor
and position
so adequate clearance with adjacent
parts to intake manifold
and remove carburetor and
mount-
is attained. Maintaining this position of the adapter, ing gasket.
tighten adapter
nut to 50-60 lb-ft (600-700
lb-in) and h. Reverse
the preceding steps for reinstallation.
safety.
Use a torque wrench, extension
and adapter Use
new gaskets when installing carburetor.
Rig
as necessary when tightening adapter nut. controls as outlined in paragraphs 11-67 and 11-68.
e. Using new gaskets, install filter assembly as Check carburetor throttle arm to idle stop arm attach-
outlined in paragraph 11-34.
Be sure to service the ment
for security and proper safetying
at each normal
engine
oil system.
engine
inspection in accordance with
figure 11-7.
11-38.
OIL COOLER. A non-congealing
oil cooler 11-43.
IDLE SPEED AND MITURE
ADJUSTMENT.
may be installed on the aircraft. The cooler is Idle speed and mixture adjustment should be accom-
mounted on the right forward
side of the engine crank-
plished after the engine has been
warmed up. Since
case directly in front
of number five cylinder and has
idle rpm may be affected
by idle mixture adjustment,
no external oil
lines. Ram air
passes through
the oil it
may be necessary
to readjust idle
rpm after setting
cooler
and is
discharged
into the engine
compartment.
the
idle mixture
correctly.
11-16 Revision 1