PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 4
Nov 30/06
1H24
12-10-00
(4)
Recommendations for Changing Oil
NOTE: Lycoming recommends changing the oil and filter each 50 hours of operation or every
four months, whichever occurs first – for engines equipped with full flow
cartridge filters. Refer to the latest revision of Lycoming Service Instruction No. 1014
and Lycoming Service Bulletins No. 446 and No. 480.
(a)
A change to additive oil should be made with a degree of caution in engines that have
been operating on straight mineral oil for several hundred hours, since the cleaning action
of some additive oils will tend to loosen sludge deposits and cause plugged oil passages.
On any engine that has been operating on straight mineral oil, and is known to be in
excessive dirty condition, do not switch to an additive or compounded oil until the engine
has been overhauled.
(b)
When changing from straight mineral oil to compounded oil, the following precautionary
steps should be taken:
1
Do not add additive oil to straight mineral oil. Drain the straight mineral oil from the
engine and fill with additive oil.
2
Do not operate the engine longer than five hours before the first oil change.
3
Check all oil screens for evidence of sludge or plugging and change oil every ten
hours if sludge conditions are evident. Resume normal oil drain periods after sludge
conditions improve.
B.
Oil Filter
(1)
The oil filter should be replaced after each 50 hours of engine operation. This is accomplished
by removing the lockwire from the bolt head at the end of the filter housing, loosening the bolt,
and removing the filter assembly from the adapter.
CAUTION:
EVIDENCE OF INTERNAL ENGINE DAMAGE FOUND IN THE OIL FILTER
JUSTIFIES FURTHER EXAMINATION TO DETERMINE THE CAUSE.
(2)
Before discarding the throwaway filter, remove the element for inspection by using a Champion
cutter tool, CT-470, available from Champion Aerospace (www.championaerospace.com),
Liberty, SC 29657. It will cut open any spin-on type of oil filter for inspection. Examine the
material trapped in the filter for evidence of internal engine damage, such as chips or particles
from bearings. In new or newly overhauled engines, some small particles of metallic shavings
might be found; these are generally of no consequence and should not be confused with
particles produced by impacting, abrasion or pressure.
(3)
After the filter has been replaced, tighten the cartridge to 15- to 18-foot-pounds of torque.
Lockwire the bolt through the loops on the side of the housing to the drilled head of the
thermostatic valve. Be sure the lockwire is replaced at both the attaching bolt head and the
thermostatic oil cooler bypass valve. Use MS-20995-C41 safety wire.
Summary of Contents for PA-28-161
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