PIPER COMA~CHE SERVICE MA~l'AL z-so. Oil Filter. (Full Flow.) a. The nil filter clement should he replaced after each 50 hours of engine operation. This accompli-bed b~ r e r n o x i n g t h c \C)I.'J;\\ ire from t h e holt h e a d at the end of the filter h o u v i n g . J o o s e n i n g the bolt. and r e m o v 109 the filter a""t:mhl~ from the adapter. b. Bclore di-carding the filter clement. remove the outer perforated paper cover. and using a "harp knife. cut through the fold" of the element at both ends. close to the metal caps. Then.
carefully untold the pleated element and examine ihc material trapped in the filter for evidence of internal engine damage -uch a" chip" or particle" from bearings. In new or newly overhauled engines. some "mall particle of metallic shaving-, might be found. The ... e art: generally of no consequence and should not be confused with particle- produced b~ impacting. abrasion or pre" ... urc. Evidence of internal engine damage found in the oil filter iustific ... further examination to determine the cause. . c. After the element has been replaced. tighten the attaching bolt within 20 to 25 foot-pound" of torque.
Lockwire the bolt through the loops 110 the side ofthe housing to the drilled head of the thcrrno-tatic valve. Be -ure the lockwire i" replaced at both the attaching bolt head and the thermostatic oil cooler h~ pa"" valve 2-xI. Recommendations for Changing Oil. (Refer to latest Lycoming Service Instruction '0. 10I .. U a. In engine" that have been operating on straight rriineral oil for several hundred hour v, a change to add it iv e oil should be made \\ ith a degree of caution. since the cleaning action of some additive oil" \\ ill tend to 100"'l.'n sludge dcpo ... its and cause plugged oil passages.
When an engine has been operating on straight mineral oil and i" know n to be in excessively dirty condition. the switch to additive or compounded nil should he deferred until alter the engine i" overhauled. h. When changing from straight mineral oil to compounded oil. the following precautionarv "ter'" ... hould he taken: I. Do not add additive oil to ... traight mineral oil. Drain the straight mineral oil from the engine and fill with additive oil. .., Do not operate the engine longer than five hours before the fir ... t oil change. ~. Check all oil screen.. for evidence of sludge or plugging. Change oil every ten hour ... if sludge condition" are e\ ident .
Resume normal oil drain period ... after sludge conditions improve. 2-~2. lubrication Instructions. Proper lubrication procedures are of immeasurable value both as a means of prolonging the ... en ice life of the airplane and as a means of reducing the frequency of extensive and expen ... ive repairs. The periodic application of recommended lubricants to their relevant bearing surfaces. a.. detailed in the following paragraphs. together with the observance of cleanliness. will insure the maximum etficicncv and utmost service of all 010\ ing parts. Lubrication instructions regarding the locations. time interval-. and t~ pe 01 lubricants used may be found in the Lubrication Chart.
Figures 2-20 thru 2~2:!. To insure the be ... t pO""lhle results from the application of lubricants. the following precautions should be observed: a. l ... e recommended lubricants. Where general purpose lubricating oil is specified. but unavailable, clean engine oil may be u ... ed as a satisfactory substitute. h. Check the components to be lubricated for evidence of excessive wear and replace them as nece ....... lr~ . c. Rl.'mO\I.' all exce .... , lubricants from components in order to prevent the collection of dirt and sand in ubravive qua ntit ie ... capable of causing excessive wear or damage to bearing surfaces. R E\'ISED: ~/ 10/81 lC21 HA!'iDLI~G A~D SERHCr'c.