PIPER CHEROKEE SIX / LANCE SERVICE MANUAL
03/27/08
II - HANDLING AND SERVICING
1C7
2-46. RECOMMENDATIONS FOR CHANGING OIL. (Refer to the latest revisions of Lycoming Service
Instruction No. 1014 and Service Bulletin No. 480.)
a.
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.
b.
When changing from straight mineral oil to ashless dispersant oil, the following precautionary steps
should be taken:
1.
Do not add ashless dispersant oil to straight mineral oil. Drain the straight mineral oil from the
engine and fill with ashless dispersant 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.
2-47. OIL FILTER (FULL-FLOW).
a.
The oil filter element 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.
b.
Before discarding the filter element, remove the outer perforated paper cover, and using a sharp
knife, cut through the folds of the element at both ends, close to the metal caps. Then, carefully
unfold the pleated element and 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 particle 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. Evidence of
internal engine damage found in the oil filter justifies further examination to determine the cause.
c.
After the element has been replaced, tighten the attaching bolt within 20 to 25 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.
Summary of Contents for Cherokee LANCE
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