Piper Navajo PA-31 Service Manual page 538

PIPER NAVAJO SERVICE MANUAL
235
Figure 8A-3. Fuel-Air Bleed Nozzle
8A-17. CLEANING AND INSPECTION OF FUEL-AIR BLEED NOZZLE.
a. Clean the nozzle with acetone or equivalent and blow out all foreign particles. Do
not use wire or other hard objects to clean orifices. (Refer to the latest revision of Lycoming
Service Instruction No. 1275.)
b. Inspect the nozzle and cylinder threads for nicks, stripping or cross-threading.
c. Inspect for battered or rounded hexagons.
d. A test procedure for air bleed nozzles is described in the latest revision of Lycoming
Service Instruction No. 1275.
8A-18. INSTALLATION OF FUEL-AIR BLEED NOZZLE.
a. It is important for the nozzles to be correctly positioned with the air bleed hole
upward.
b. Install the nozzles and tighten the nozzles to a little less than 60 inch-pounds torque.
c. Continue to tighten the nozzles until the letter or number stamped on the hex of the
nozzle body points downward. In this position the air bleed hole will face upward.
NOTE
Do not exceed 60 inch-pounds torque on nozzles when
aligning air bleed hole.
d. Connect fuel line to nozzle.
CAUTION
Start nozzles and line couplings by hand to prevent the
possibility of cross-threading.
e. Install engine cowl per Installation of Engine Cowling, Section VIII.
Revised: 9/24/81
POWER
PLANT
2K16