Cessna 1969-1976 172 Series Service Manual page 25

commercial suppliers of aircraft products.
2-35. ENGINE AND ENGINE COMPARTMENT. The
engine should be kept clean since dirty cooling fins
and baffle plates can cause overheating of the engine.
IAlso, cleaning is essential t o minimize any danger of
f i r e and provide for e a s i e r inspection of components.
The entire engine cowling may be removed to facili-
'
tate engine and interior cowl cleaning. Wash down
the engine and components with
a suitable solvent,
such
as Stoddard solvent or equivalent, then d r y thor
-
I
oughly with compressed a i r .
Particular c a r e should be given to electri-
cal equipment before cleaning. Solvent
should not be allowed to enter magnetos,
s t a r t e r s , alternators, voltage regulators,
and the like. Hence, these components
should be protected before saturating the
engine with solvent. Any fuel, oil, and air
openings should be covered before washing
the engine with solvent. Caustic cleaning
solutions should not be used. After clean-
ing engine, re-lubricate all control a r m s
and moving parts.
2-36. UPHOLSTERY AND INTERIOR. Keeping the
upholstery and interior t r i m clean prolongs uphol-
s t e r y fabric and interior t r i m life. To clean the in-
t e r i o r proceed
as follows:
to remove dust and dirt.
a.
Empty all a s h trays and refuse containers.
b. Brush o r vacuum clean the upholstery and carpet
c. Wipe leather and plastic t r i m with
a
damp cloth.
d. Soiled upholstery fabrics and carpet may be
cleaned with
a f0a.m-type detergent used according
to the manufacturer's instructions.
hold spot removers, used sparingly. Before using
any solvent, read the instructions on the container
and test it on an obscure place in the fabric to be
cleaned. Never saturate the fabric with volatile sol-
vent; it may damage the padding and backing materiaL
f .
Scrape sticky material from fabric with a dull
knife, then spot clean the area.
I
e. Oil spots and stains may be cleaned with house-
2-37. PROPELLER.
a. Wash hub and blade with a soft cloth and Stod-
dard cleaning solvent or equivalent, then dry thor-
oughly with compressed air. The propeller should
be wiped occasionally with a n oily cloth, then wiped
with
a dry cloth. In salt water a r e a s this will assist
in corrosion proofing the propeller.
2-38. WHEELS. The wheels should be washed per-
iodically and examined
f
or corrosion, chipped paint,
and cracks
or dents i n the wheel halves or in the
flanges or hubs. If defects a r e found remove and r e -
pair
in
accordance with Section 5. Discard cracked
I
wheel halves, flanges o r hubs and install new parts.
2-39. LUBRICATION.
2-40. Lubrication requirements a r e shown in figure
2-5. Before adding grease to grease fittings, wipe
dirt f r o m fitting. Lubricate until grease appears
around parts being lubricated, and wipe excess
grease from parts. The following paragraphs sup-
plement figure 2-5 by adding details.
2-41. WHEEL BEARINGS. Clean and repack the
wheel bearings
at
first 100-hour inspection and
at
each 500-hour inspection thereafter. If more
than the usual number of take-offs and landings a r e
made, extensive taxiing is required, or the aircraft
is operated in dusty a r e a s or under seacoast condi-
tions, cleaning and lubrication of the wheel bearings
shall be accomplighsd
at
each 100-hour inspection.
2-42. NOSE GEAR TORQUE LINKS. Lubricate nose
gear torque links every 50 hours. When operating i n
dusty conditions, more frequent lubrication is re-
qui r e d.
2-43. WING FLAP ACTUATOR.
00805, not modified by Service Kit SK150-37B and
SK150-41, proceed
as
follows:
1. At each 100 hour inspection, inspect wing
flap actuator jack screw and ball retainer assembly
for lubrication, and lubricate if required. Also,
remove, clean and lubricate jack screw whenever
actuator slippage
is experienced. If lubrication is
required, proceed
as
follows:
a. Gain access to actuator by removing
appropriate inspection plates on lower surface of
wing.
b. Expose jack screw by operating flaps to
full-down position.
c. Wipe
a small amount of lubricant from
jack screw with
a r a g and examine for condition.
(Lubricant should not be dirty, sticky, gummy or
frothy in appearance. )
d. Inspect wiped a r e a on jack screw for
presence of hard scale deposit. Previous wiping
action will have exposed bare metal if no deposit is
present.
clean and relubricate jack screw a s outlined in steps
I f f "
thru
rrrrr.
f . Remove actuator from aircraft in accor-
dance with procedures outlined in Section
7.
g. Remove all existing lubricant from jack
screw and torque tube by running the nut assembly
to the end of the jack screw away from the gear box,
and soaking the nut assembly and jack screw i n
Stoddard solvent.
a. On aircraft prior to Serials 17259905 and F172-
e. If any of the above conditions exist,
NOTE
C a r e must be taken to prevent solvent from
entering gear box. The gear box lubricant
is not affected and should not be disturbed.
Change 3 2-11