Piper SEMINOLE PA-44-180, Maintenance Manual

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— Note —
Add one six ounce can of LW-16702 to the engine oil every 50 hours or at each oil
change in accordance with the latest revision of Lycoming Service Bulletin No. 446.
The engine manufacturer does not recommend oils by brand names. Use a quality brand Aviation Grade oil of
the proper season viscosity.
DRAINING OIL SUMP.
To drain the oil sump, provide a suitable container with a minimum capacity of that required to fill the sump.
Remove the upper cowl, on the inboard lower side of each engine an oil quick drain is provided. To drain oil
place a tube of the proper diameter on the quick drain and push into drain. After completion of draining remove
tube and check to make sure that quick drain has properly sealed. It is recommended the engine be warmed to
operating temperature to insure complete draining of the old oil.
FILLING OIL SUMP.
The oil sump should normally be filled with oil to the mark on the engine dipstick. The specified grade of oil
may be found in the Lubrication Chart, or on the cowl panel access door of each engine. To service the engine
with oil, open the access door of the cowl and remove the oil filler cap.
OIL SCREEN (SUCTION ).
The oil suction screen is located on the bottom aft end of the engine sump, installed horizontally. to remove,
cut the safety wire and remove the hex head plug. The screen should be cleaned at each oil change to remove any
accumulation of sludge and to examine for metal filings or chips,. If metal particles are found in the screen, the
engine should be examined for internal damage. After cleaning and inspection, place the screen inside the recess
in the hex head plug to eliminate possible damage to the screen. Insert the screen into the housing and when
certain that the screen is properly seated, tighten and safety the plug with MS-20995-C41 safety wire.
RECOMMENDATIONS FOR CHANGING OIL.
Refer to latest revision of Lycoming Service Instruction No. 1014 and Service Bulletin No. 446.
1. In engines that have been operating on straight mineral oil for several hundred hours, a change to ashless
dispersant oil should be made with a degree of caution, since the cleaning action of some ashless dispersant oils
will tend to loosen sludge deposits and cause plugged oil passages. When an engine has been operating on
straight mineral oil and is known to be in excessively dirty condition, the switch to ashless dispersant oil should
be deferred until after the engine is overhauled.
2. When changing from straight mineral oil to ashless dispersant oil, the following precautionary steps should
be taken:
a. Except when using LW-16702 (Lycoming Service Bulletin No. 446) do not add ashless dispersant to
straight mineral oil. Drain the straight mineral oil from the engine and fill with ashless dispersant.
b. Do not operate the engine longer than five hours before the first oil change.
c. Check all oil screens for evidence of sludge or plugging and change oil every ten hours if sludge
conditions are evident. Repeat 10 hour checks until clean screen is noted, then change oil at
recommended time intervals.
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
1 2 - 1 2 - 0 4
Page 12-03
Revised: May 15, 1989
1D3
PIPER AIRCRAFT