8A-39. INSTALLATION OF SPARK PLUGS. Before installing spark plugs, ascertain that the threads within
the cylinder are clean and not damaged.
a. Apply anti-seize compound sparingly on the threads and install gasket and spark plugs. Torque 360 to
420 inch-pounds.
CAUTION
Make certain the deep socket is properly seated on the spark plug hexagon
as damage to the plug could result if the wrench is cocked to one side when
pressure is applied.
b. Carefully insert the terminal insulator in the spark plug and tighten the coupling unit.
8A-40. LUBRICATION SYSTEM.
8A-41. OIL PRESSURE RELIEF VA LVE. The function of the oil pressure relief valve, which is located
between the upper right engine mounting lug and No. 3 cylinder, is to maintain engine oil pressure within
specified limits by withdrawing a portion of the oil from the circulating system and returning the oil to the
sump should the pressure become excessive. This valve is not adjustable; however, particles of metal or other
foreign matter lodged between ball and seat will result in a drop in oil pressure. It is advisable, therefore, to
disassemble, inspect and clean the relief valve if excessive pressure fluctuations are noted.
The oil pressure relief valve is by no means to be confused with the oil cooler by-pass which is located on
the oil pressure screen housing mounting pad. The sole purpose of the by-pass valve is to serve as a safety
measure, permitting pressure oil to by-pass the oil cooler entirely in case of an obstruction within the cooler.
8A-42. ENGINE OIL QUICK DRAIN VALVE. When replacing the engine oil quick drain, refer to the Piper
Parts Catalog for the correct part number. Installation of an incorrect drain could lead to damage of the sump or
the drain itself. This may result in loss of engine oil and a possible engine seizure.
Revised: 5/1/80
2E2
CHEROKEE ARROW III SERVICE MANUAL
POWER PLANT - LYCOMING
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