(7.) Check solenoid brake assembly for excess wear, broken parts, sticking or burned out solenoid. Repair or replace as necessary.
EFFECTIVITY:
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PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL

A. Distribution(continued)
6. OilCoolerExhaustDoor(continued)
(c) Cleaning,Inspection,andRepairofOilCoolerDoorTransmission(continued)
(8.) Aftertransmissionscrewandtubearecleanedanddried,applycoatingofaircraftactuator greasespecificationMIL-G-23827
to screw,ballnut,andtransmission. (9.) Whentransmissionassembly foranyreason,repack75percentfullwith
isdisassembled
Dukes(P/N2196-74-1)grease.

(d) AdjustmentoftheOilCoolerDoor (Figure402)
(1.) Adjustsleeveontransmissionrodsooilcoolerdoorisflushwithbottomofnacelleinfully
closedposition. (2.) Checkall attachmenthardwareforproperinstallationandsecurity. (3.) Checkoperationof oilcoolerdoorsbycompletingopeningandclosingcycle.
Firewall
TransmissionAssembly  Oil CoolerDoorAnnunciatorSwitch (Locatedon the Firewall)
Oil CoolerExhaustDoor SwitchActuator
RodEnd

OilCoolerDoorInstallation
Figure402

EFFECTIVITY:
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PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL

A. Indicating
1. Calibrationof Engine Oil PressureIndicating System
Checkcalibration of engineoil pressure indicatingsystem as follows:
(1.) Connect a pressure testerset with a calibratedtest gauge to oil transmitterusing appropriateAN fitting and pressure line. (Test set must be capable of providing and monitoring static pressures from0 -160 psi using engineoil.)
(2.) Turn ON aircraftmasterswitch.
(3.) Allow fittings to remain loose and position valve towards line.
(4.) Turn handle clockwise until air is bled from line (oil must drip from line). Tighten fitting.
(5.) Turn valve towardsreservoirand turn handle counterclockwise.
(6.) Turn valve towards line and turn handle clockwise again to attain high pressure of 135 psi.
(7.) Compare test gauge reading with oil pressure gauge reading.
(8.) Turn handle counterclockwise for a low pressure of 105 psi.
(9.) Againcomparetestgauge reading with oil pressuregaugereading.

NOTE: Tap test gauge to reduce frictionalerrors.
(10.)Begincheckingoil pressure system by following values in Chart 1. Keep within tolerances stipulated. (11.)Aftercompletingtest, turn tester valve to NEUTRAL (perpendicularto the line) and disconnecttester. (12.) Reconnect any lines previouslyremoved.
CHART 1
OIL PRESSURE GAUGE CALIBRATION DATA

PSI TOLERANCE
50 0-60 psi = + 5 psi 60 80 60-120 psi = +3 psi
105 120 120-200 psi = +5 psi 135 155
EFFECTIVITY: PAGE1
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PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

A. Indicating (continued)
1. Oil Temperature Probe
The oil temperature probe is located on right side of engine accessorysectionbelow overboard breather port. The MS-28034-3unit can be tested for proper resistance if a discemable temperaturecanbe achieved. (Refer to Chart 2.) Install unit as follows:
(a) Lubricatenew MS-35768-8 gasketin engine oil and install on unit.
(b)Screw fitting assembly into boss unit until it bottoms tightly in engine fitting.
CHART2 
OIL TEMPERATURE BULBSPECIFICATIONS 
°C  Ohms Resistance  °C  Ohms Resistance 
-40 (-40°F)  77.39 ±.40  60 (140°F)  112.28±.50 
-30  80.56 ±.40  70  116.27+.50 
-20 (-4°F)  83.77 ±.40  80 (176°F)  120.36 ±.50 
-10  87.04 ±.04  90  124.44 ±.50 
0(32°F)  90.38 ±.40  100(212°F)  128.85 ±.50 
10  93.8+.40  110  133.26±.50 
20 (68°F)  97.31+.40  120  137.78 ±.60 
30 (86°F)  100.91 ±.40  130  142.40 ±.60 
40 (104°F)  104.6 ±.40  140  147.11 ±.60 
50  108.39 ±.40  150 (302°F)  151.91+.60 

EFFECTIVITY:
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PIPER AIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCE MANUAL

CHAPTER 91

LIST OF EFFECTIVE PAGES

CHAPTER  CHAPTER 
SECTION  PAGE  DATE  SECTION  PAGE  DATE 
91-EFFECTIVITY  1  Feb 1/98 
91-CONTENTS  1  Jan 10/90 
91-00-00  1  Jan 10/90 
　
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