(b)
Disconnectmountingblocksfor drainlinesfrombracketsconnectedto airductflange. Theoil breatherlineon rightsideof eachenginemayneedto be disconnectedfromaffectedmounting blocks. Bracketwith linesattachedcanbe disconnectedfromflange.
(c)
Removeoil coolerdrain plug,drainoil fromcoolerandenoughfrom linesto preventexcess amountof oilfromflowingoveraffectedassemblies.
CAUTION: CAPOILCOOLERINLETANDOUTLETLINESTO PREVENT CONTAMINATION.
(d)
Disconnectcoolerinletand outletlines.
(e)
Properlysupportoil cooler. Removeattachinghardwaremountingassemblyto duct. Remove oil cooler.
4. Installationof Oil Cooler (Figure401)
(a)
Positionoil coolerin airductwith inletandoutletlinestowardsrightsideof engine. Install hardware,mountingcoolerto duct.
(b)
Reattachdrain linesand supportbrackets.
(c)
Connectlinesto properconnectionon oil cooler. Installandsafetywiredrain plug(if removed).
(d)
Checkoil levelandfill as required.
(e)
Performenginemotoringrunto checkfor leaks.
(f)
Recheckoil level andfill as necessary.
(g)
Installbottomcowlingsupportpanelandupperandlowerenginecowling.
EFFECTIVITY:
040-999 79-20-00 PAGE
79-20-00Jan
Jan 10/90
A. EngineOil SumpBreather Distribution (continued) PIPER AIRCRAFT PA-42-720 (Advanced Trainer) MAINTENANCE MANUAL Outlet Hose
Outlet
Oil Cooler Installation Figure 401 Cover
PreformedPacking
TeflonSpacer
PreformedPacking
FilterElement
PreformedPacking
Oil Filter Assembly
Figure 201
EFFECTIVITY: 040-999
PAGE 79-20-00
Jan10/90
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
A. Distribution(continued)
5. Oil Filter Element Maintenance (Figure 201)
The engine oil filter must be inspected each 100 hours time in service, and must be replaced each 1000 hours time in service.
Between required replacement times, light sediment only may be removed using proper cleaning procedure. All other contamination requires replacement of filter element.
NOTE: Refer to Pratt and Whitney Maintenance Manual, p/n 3034342, Chapter 79 for detailed procedures and techniques for removing, inspecting, cleaning, and installing the engine oil filter.
6. Oil Cooler Exhaust Door
(a) Removal of Oil Cooler Door Transmission (Figure 402)
(1.) Remove bottom cowling and cowling support panel to gain access to transmission
assembly. (2.) Extend oil cooler door to full open position. (3.) Disconnect electrical leads from transmission and motor assembly.
NOTE: Identify leads to facilitate reinstallation.
(4.) Disconnect transmission rod from oil cooler door. Remove sleeve, jam nut, spring, spacer, and seal from transmission rod. (5.) Disconnect transmission from firewall mounting bracket. Remove complete assembly from aircraft.
(b) Installation of Oil Cooler Door Transmission (Figure 402)
(1.) Position transmission assembly in mounting bracket with rod protruding through oil cooler duct. Secure with proper attachment hardware. Allow transmission to rotate on its mounting bracket.
(2.) Connect electrical leads to transmission assembly.
(3.) Place seal, spacer, and spring on transmission rod. Screw jam nut and sleeve onto rod.
(4.) Connect transmission rod to oil cooler door with attachment hardware.
(5.) Adjust oil cooler door.
(c) Cleaning, Inspection, and Repair of Oil Cooler Door Transmission
NOTE: Follow this procedure when conducting 500 hour special inspection for oil cooler door transmission. Also refer to 12-20-00, Chart 6.
(1.) Clean transmission assembly with suitablesolvent.
(2.) Inspect transmission tube for excessive end or side play on transmission screws.
(3.) Check that transmission tube, screw, and rod end are not distorted or bent.
(4.) Check that screw bearing is not loose on transmission screw or within transmission
housing. Determine excess wear by holding transmission and moving screw up and
down.
(5.) Check for excess wear within transmission by turning screw by hand and noting end and side play in transmission drive shaft. End play should not be great enough to cause end pressure on motor drive shaft.
(6.) If any checks show excess wear, corrosion, or damage, replace transmission or its
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