Lubrication And Servicing Procedures; Servicing Intervals Check List - Cessna 172 Skyhawk Owner's Manual

LUBRICATION AND SERVICING PROCEDURES

Specific servicing information is provided here for items requiring daily attention.
A Servicing Intervals Check List is included to inform the pilot when to have
other items checked and serviced.
FUEL TANK FILLERS:
Service after each flight with 80/87 minimum grade fuel. The capacity of
each tank is 21 gallons. When optional long range tanks are installed, the
capacity of each tank is 26 gallons. (To ensure maximum fuel capacity
when refueling, place the fuel selector valve in either "LEFT" or "RIGHT"
position to prevent cross-feeding).
FUEL STRAINER:
Before the first flight of the day and after each refueling, pull out fuel
strainer drain knob for about four seconds, to clear fuel strainer of possible
water and sediment. Release drain knob, then check that strainer drain is
closed after draining. If water is observed, there is a possibility that the
fuel tank sumps contain water. Thus, the fuel tank sump drain plugs and
fuel selector valve drain plug should be removed to check for the presence
of water.
OIL DIPSTICK:
Check oil level before each flight. Do not operate on less than 6 quarts.
To minimize loss of oil through breather, fill to 7 quart level for normal
flights of less than 3 hours. For extended flight, fill to 8 quarts. If
optional oil filter is installed, one additional quart is required when the
filter element is changed.
OIL FILLER:
When preflight check shows low oil level, service with aviation grade
engine oil; SAE 50 above 60°F, SAE 10W30 or SAE 30 at temperatures
from 0° to 70°F, and SAE 10W30 or SAE 20 at temperatures below
10°F. (Multi-viscosity oil with a range of SAE 10W30 is
recommended for improved starting and lubrication during warm-up in
cold weather.) Detergent or dispersant oil, conforming to
Specification No. MIL-L-22851, must be used. Your Cessna Dealer
can supply approved brands of oil.
Your Cessna was delivered from the factory with a corrosion
preventive aircraft engine oil. If oil must be added during the
first 25 hours, use only aviation grade straight mineral oil
(non-deter gent) conforming to Specification No. MIL-L-6082.
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DAILY
NOTE

SERVICING INTERVALS CHECK LIST

F I R S T 25 H O U R S
ENGINE OIL SUMP, OIL COOLER AND OIL FILTER -- After first 25 hours
of operation, drain engine oil sump and oil cooler and clean both the oil
suction strainer and oil pressure screen. If an optional oil filter is installed,
change filter element at this time. Refill sump with straight mineral oil (non-
detergent) and use until a total of 50 hours have accumulated or oil
consumption has stabilized, then change to detergent oil.
EACH 50 HO UR S
BATTERY -- Check and service. Check oftener (at least every 30 days)
if operating in hot weather.
ENGINE OIL SUMP, OIL COOLER AND OIL FILTER -- On airplanes not
equipped with an optional oil filter, drain the engine oil sump and oil
cooler and clean both the oil suction strainer and oil pressure screen.
On the airplanes which have an optional oil filter, the oil change interval
may be extended to 100-hour intervals providing the oil filter element is
changed at 50-hour intervals. Change engine oil at least every four months
even though less than 50 hours have accumulated. Reduce intervals for
prolonged operation in dusty areas, cold climates, or when short flights
and long idle periods result in sludging conditions.
CARBURETOR AIR FILTER -- Clean or replace. Under extremely dusty
conditions, daily maintenance of the filter is recommended.
NOSE GEAR TORQUE LINKS -- Lubricate. When operating under dusty
conditions, more frequent lubrication is recommended.
EACH 100 H O U R S
SPARK PLUGS -- Clean, test and regap.
BRAKE MASTER CYLINDERS -- Check and fill.
SHIMMY DAMPENER -- Check and fill.
FUEL STRAINER -- Disassemble and clean.
FUEL TANK SUMP DRAINS -- Drain water and sediment.
FUEL SELECTOR VALVE DRAIN PLUG -- Drain water and sediment.
SUCTION RELIEF VALVE INLET SCREEN (OPT) -- Clean.
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