Cessna 188 Series Service Manual page 181

MODEL 188 & T188 SERIES SERVICE MANUAL
11-74. STARTER MOTOR.
pit. The tailpipe is welded to the muffler. A shroud
Is attached to the left exhaust stack to provide heated
11-75. REMOVAL AND INSTALLATION. air for the alternate induction air source.
a. Remove engine cowling in accordance with para-
graph 11-3.
11-79. REMOVAL AND INSTALLATION.
a. Remove engine cowling in accordance with para-
CAUTION graph 11-3.
b. Disconnect ducts from heater shroud on muffler
When disconnecting starter electrical cable, assembly.
do not permit terminal bolt to rotate. Ro- c. Disconnect duct from carburetor heat shroud on
tation of the bolt could break the conductor left exhaust stack assembly.
between bolt and field coils causing the
starter to be inoperative.
NOTE
b. Disconnect battery cables and insulate as a
On serials 188-0001 and ON, if equipped with
safety precaution.
SK182-78 kit, the carburetor heat shroud is
c. Disconnect electrical cable at starter motor.
attached to the engine mounts and must be
d. Remove nuts and washers securing motor to
removed before removing the exhaust system.
starter adapter and remove motor.
Refer to engine
manufacturer's overhaul manual for adapter removal.
d. Remove nuts, bolts and clamps attaching stack
e. Reverse the preceding steps for reinstallation.
assemblies to the muffler.
Install a new O-ring seal on motor, then install motor.
e. Loosen nuts attaching exhaust stacks to the
Be sure motor drive engages with the adapter drive
cylinders and remove muffler assembly.
when installing.
f.
Remove nuts attaching exhaust stack assemblies
to the cylinders and remove exhaust stacks and gas-
11-76. PRIMARY MAINTENANCE.
The starting kets.
circuit should be inspected at regular intervals, the
g. Reverse the preceding steps for reinstallation.
frequency of which should be determined by the
Install a new copper-asbestos gasket between each
amount of service and conditions under which the
riser and its mounting pad on each cylinder, regard-
equipment is operated.
Inspect the battery and wir-
less of apparent condition of those removed.
Torque
ing.
Check battery for fully charged condition, proper
exhaust stack nuts at cylinders to 100-110 pound-
electrolyte level with approved water and terminals
inches
for cleanliness. Inspect wiring to be sure that all
connections are clean and tight and that the wiring
11-80. INSPECTION. Since exhaust systems of this
insulation is sound. Check that the brushes slide
type are subject to burning, cracking and general
freely in their holders and make full contact on the
deterioration from alternate thermal stresses and
commutator.
When brushes are worn to one-half of
vibrations, inspection is important and should be
their original length, install new brushes (compare
accomplished every 100 hours of operation.
Also, a
brushes with new brushes).
Check the commutator thorough inspection of the engine exhaust system
for uneven wear, excessive glazing or evidence of
should be made to detect cracks causing leaks which
excessive arcing.
If the commutator is only slightly could result in loss of engine power.
To inspect the
dirty, glazed or discolored, it may be cleaned with a
engine exhaust system, proceed as follows:
strip of No. 00 or No. 000 sandpaper.
If the commu-
a. Remove engine cowling as required so that ALL
tator is rough or worn, it should be turned in a lathe
surfaces of the exhaust assemblies can be visually
and the mica undercut.
Inspect the armature shaft
inspected.
for rough bearing surfaces.
New brushes should be
properly seated when installing by wrapping a strip NOTE
of No. 00 sandpaper around the commutator (with
Especially check the areas adjacent to welds
sanding side out) 1-1/4 to 1-1/2 times maximum.
Drop brushes on sandpaper covered commutator and and slip joints.
Look for gas deposits in sur-
turn armature slowly in the direction of normal
rounding areas, indicating that exhaust gases
tation. Clean sanding dust from motor after sanding
are escaping through a crack or hole or
operations. around the slip joints.
b. After visual inspection, an air leak check should.
11-77. EXHAUST SYSTEM. be made on the exhaust system as follows:
1. Attach the pressure side of an industrial
11-78. DESCRIPTION. The exhaust system consists vacuum cleaner to the tailpipe opening, using a rub-
of two exhaust stack assemblies, for the left and right ber plug to effect a seal as required.
bank of cylinders.
Each cylinder has a riser pipe
attached to the exhaust port.
The three risers at each NOTE
bank of cylinders are joined together into a collector
pipe forming an exhaust stack assembly. The center The inside of the vacuum cleaner hose should
riser on each bank is detachable, but the front and aft be free of any contamination that might be
risers are welded to the collector pipe.
Each exhaust blown into the engine exhaust system.
stack assembly connects to the muffler beneath the
engine. The muffler is enclosed in a shroud which
captures exhaust heat which is used to heat the cock-
Revision 1 11-25