Replacing Pump Fittings; Installation Of Vacuum Pump - Piper Dakota Maintenance Manual

REPLACING PUMP FITTINGS

l. Before installing any fittings on the pump, check for external damage.
Do not apply vise pressure to outside diameter or overall length of
the pump.
Do not use pipe tape, thread dope, hydrocarbon oil or grease, as
these can contaminate the pump.
2. When a vise is used to hold the pump while installing fittings, suitable caution must be exercised to
avoid pump damage. The square mounting flange must be held between soft wood blocks and only at
right angles to vise jaws. Only use enough vise pressure to hold pump firmly.
3. Airborne pump ports are treated with a dry film lubricant and Airborne fittings are cadmium plated.
This eliminates any need for thread lubricants. If thread lubricant is required, use a powdered moly-
sulfide or graphite in dry form or in an evaporating vehicle; or use a silicone spray. Apply sparingly to
external threads of fittings only.
4. With pump properly secured in vise, insert fittings in ports and hand tighten.
5. Use a wrench to tighten each flatting one-half to two additional turns.

INSTALLATION OF VACUUM PUMP

The only pump mounting gasket approved for use on Airborne
vacuum pumps is the Airborne gasket B3-1-2, Piper part number
751 859. Any other gasket may allow oil seepage or leakage at
mounting surface.
l. Place pump gasket in place and align spline on pump drive with spline on engine drive assembly.
2. Secure pump to engine with four plain washers, lock washers, and retaining nuts. Tighten nuts to a
torque of 50 to 70 inch-pounds.
3. Connect hoses to pump and secure with hose clamps.
4. Reinstall engine cowling.
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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2E8
37 - 12 - 00
Page 37 - 06
Reissued: August 1, 1986