Servicing Oil Filter Elements - Piper Cheyenne IIIA Airplane Maintenance Manual

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
V. Draining Engine Oil (continued)
5. Remove drain plug from oil-to-fuel heater.
CAUTION: LIMIT ENGINE ROTATION TO MINIMUM TIME REQUIRED TO ACCOMPLISH
COMPLETE DRAINING. DO NOT EXCEED STARTER TIME LIMITS (30 SECONDS
ON, 1 MINUTE OFF, 30 SECONDS ON, 1 MINUTE OFF, 30 SECONDS ON, 30
MINUTES OFF).
6. With drains open and ignition and condition lever off, motor engine with starter only; allow
scavenger pumps to clear all lubricating oil.
7. Install new preformed packings on chip detector and plugs.
8. Reinstall chip detector and drain plugs. (Refer to t00-00 for torque values.)
9. Refill oil tank with specified oil. (See latest revision of Pratt & Whitney Service Bulletin 13001.)
Normal oil lever is one quart below maximum level (hot). Over filling causes excess oil to flow
through accessory gearbox breather.
10. Start engine and run at idle speed for minimum 2 minutes.
11. Feather propeller and shut down engine.
12. Repeat steps 1 through 6.
13. Remove and clean main oil filter.
14. Remove and clean reduction gearbox oil strainer.
15. Reinstall all engine drain plugs and chip detector; tighten, torque, and lockwire. (Refer to 91-00-
00 for torque values.)
16. Repeat steps 7 through 10.
17. Check oil level; replenish as required.
18. Install filler cap and dipstick assembly in filler tube. Ensure cap is correctly installed and locked
securely.
W. Servicing Oil Filter Elements
CAUTION: PLUG BOTH ENDS OF FILTER ELEMENT BEFORE SUBMERGING IN VARSOL
CLEANER. THE ELEMENT MUST NEVER BE ULTRASONICALLY CLEANED,
PRESSURE FLUSHED, OR DRIED WITH COMPRESSED AIR CAUSING DAMAGE TO
FILTER MEDIA.
Oil filter elements must be cleaned every 100 hours. Remove and inspect for foreign material and
hand flush in petroleum solvent (AMS 3160 Varsol) bath to remove light contaminants collected on
external protective screening. Service life of filter element is 1000 hours.
If cleaning method previously described proves ineffective, clean filter element electrosonically.
1. Plug openings at each end of filter element with suitable plastic or rubber plugs.
2. Place filter element in electrosonic cleaner tank.
3. Add sufficient quantity of cleaning solvent to tank. (Approximately 1/4 inch below top edge of
tank.)
4. Operate unit for 10 minutes.
5. Rotate element (end-to-end) 180
°
in cleaning tank and operate unit for additional 10 minutes.
NOTE: Adjust cleaning duration depending on condition of element. For best results, replace
cleaning solvent every 20 minutes.
6. Remove element from tank using clean, lint-free gloves; remove plugs.
7. Place element in clean location and allow to dry.
8. After element is cleaned, inspect with magnifying glass for clogged passages and broken wires. If
more than five percent of visible passages are clogged, return element to overhaul facility. If dents
or broken wires are found, replace element.
9. Install new O-rings on filter element whether element is cleaned or new.
10. Insert filter element (perforated flange first) into filter housing in compressor inlet case.
EFFECTIVITY:
040-999
12-10-00
Jan 10/90