Piper Navajo PA-31 Service Manual page 487

PIPER NAVAJO SERVICE MANUAL
2. The filter can be cleaned by washing in a good non-sudsing detergent or the filter manufacturer's
cleaner D-1400. Mix two oz. of D-1400 to one gallon of water.
3. Soak filter in solution for 15 minutes, then move filter back and forth about two minutes to free
filter of dirt deposits.
4. Rinse complete filter in a stream of water until rinse water is clear. (Maximum water pressure 40
psi.) A good thorough rinse is very important.
5. Dry filter thoroughly before re-using. Do not use light bulbs or extreme heat for drying.
c. After cleaning, hold filter up to a light bulb and inspect for damage or ruptures. Filter should not be
oiled after cleaning.
8-37. INSTALLATION OF FILTER.
a. Position filter in filter plenum with gasket up.
b.
Insert filter mounting brackets out through the slots in the plenum sides and secure with screws.
Tighten screws only enough to hold filter firm.
c. Install engine cowl. (Refer to Paragraph 8-6.)
8-38. ALTERNATE AIR DOOR. The alternate air door located in the induction system, on the left side of
the air filter plenum, between the air filter and the turbocharger compressor inlet, is to provide a source of air
should there be an air stoppage through the filter system. The following should be checked during inspection:
a. All door seals are tight and hinges secure.
b. Actuate the door to determine that it is not sticking or binding.
c. Ascertain that the door will "crack" open with 57 to 59 oz. of force applied to the door at the portion
of the door viewed through the round opening nearest to the door hinge. This tension can be adjusted with the
door spring adjustment screw at the side of the opening.
d.
Check the cockpit control cable for free travel.
e. Check that when the control knob in the cockpit is full in, the cable is adjusted to allow approximately
one-eight inch between the actuating arm roller and the door when fully closed.
8-39. FUEL INJECTOR.
8-40. FUEL INJECTOR MAINTENANCE.
a. In general, little attention is required between injector overhauls. However, it is recommended that
the following items be checked during periodic inspection of the engine.
1. Check tightness and lock of all nuts and screws which fasten the injector to the engine.
2. Check all fuel lines for tightness and evidence of leakage. A slight fuel stain adjacent to the air
bleed nozzles is not cause for concern.
Revised: 9/23/80
POWER PLANT
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