OIL FILTER (Full Flow)
l. Replace oil filter after each 50 hours of engine operation. Remove safety wire from bolthead at
end of filter housing. Loosen bolt and remove filter assembly from adapter.
2. Remove filter element for inspection before discarding filter, using a Champion cutter tool CT470,
available from Champion Spark Plug Co., Toledo, OH 43601. Examine maternal trapped in filter
element for evidence of engine damage, such as chips or particles from bearings. Evidence of
internal damage found in filter element justifies further investigation to determine cause.
3. Install new filter. Tighten to a torque of l8 to 20 foot-pounds. Attach safety wire to bolt through
loops on side of housing to drilled head of thermostatic valve. Be sure safety wire is replaced at
both attaching bolthead and thermostatic oil cooler bypass valve. Use MS-20995-C4l safety wire.
SCHEDULED SERVICING
FUEL SYSTEM
SERVICING FUEL SYSTEM
—CAUTION—
Assure that additive is directed into flowing fuel stream. Additive
flow must start after and stop before fuel flow. Do not permit
concentrated additive to come in contact with aircraft painted
surfaces or interior surfaces of fuel tanks.
—CAUTION—
Some fuels have anti-icing additives pre-blended No further
blending should be performed on these fuels.
—CAUTION—
Fuel additives cannot be used as a substitute for preflight
draining of fuel system drains.
1. Clean fuel screens or filters at intervals of 50 hours or 90 days, whichever comes first. Fuel filter
unit screens and bowl are located on left side panel next to pilot seat. Screen of electric fuel pump
is located on firewall (left side). Clean screen located in inlet side of carburetor.
2. Disconnect fuel line at carburetor to flush fuel tanks and selector valve.
3. Select a fuel tank. Turn ON electric fuel pump and flush fuel through system until there is no dirt
and foreign matter in fuel valve or tank.
—NOTE—
Agitation of fuel within the tank will help pick up and remove
any dirt.
4. Repeat this procedure for each tank.
5. Clean all filters when all tanks are flushed.
—NOTE—
The PA -28-236 aircraft is approved for operation with an anti-
icing fuel additive. The anti-icing additive must meet
specification MIL-I27686, must be uniformly blended with fuel
while refueling, must not exceed 0.15% by volume of refueled
q u a n t i t y, and to ensure its effectiveness must be blended at not
less than 0.10% by volumn (one and one-half liquid ozs. per ten
gallon of fuel). A blender supplied by the additive manufacturer
should be used. Except for the information contained in this
section, the manufacturers mixing or blending instructions must
be carefully followed.
12 - 21 - 00
Page - 12 - 04
Reissued: August 1, 1986
1C24
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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