Piper Navajo PA-31 Service Manual page 485

342
NOTE
c449
ALL ADJUSTMENTS TO WASTE-
TURNTHISSCREWTOADJUSTFOR
OPEN POSITION OF BUTTER-FLY
GATE MUST START FROM THE VALVE (SEE NOTE)
REFER TO TABLE CLOSED POSITION FIRST THEN
FOR CLEARANCES
TO THE OPEN POSITION.
-- A
TURN THIS SHAFT TO ADJUST FOR
CLOSED POSITION OF BUTTER-FLY
VALVE.(SEE NOTE)
VALVE CLEARANCE
TIO-540- TIO-540-
AANDJSERIES FSERIES
LUBRICATE WITH
A
.023-.037
.007-.022
MOUSE MILK OR WD-40
PENETRATING OIL B .730-.750 .730-.750
Figure 8-7b. Exhaust Waste Gate
NOTE
This is a non-adjustable (in the field) controller, unless the proper
equipment is available. Refer to the latest revision of Garrett Aire-
search Publication No. TP21-0109 and latest revision of Lycoming
Service Letter No. L184.
8-33i. INSTALLATION OF DIFFERENTIAL PRESSURE CONTROLLER.
a. Ascertain that all oil inlet and outlet lines are clean.
b. Position the controller on the compressor discharge housing and secure with mounting bolts.
c.
Reconnect inlet and outlet oil lines to the controller.
8-33j. EXHAUST WASTEGATE ASSEMBLY.
8-33k. REMOVAL OF EXHAUST WASTEGATE ASSEMBLY.
a. Remove engine cowling. (Refer to Paragraph 8-5.)
b. Disconnect oil lines and drain line from wastegate assembly.
c. Remove V band clamps securing wastegate to exhaust transition and tailpipe.
8-331. EXHAUST WASTEGATE VALVE SETTINGS. (Refer to Figure 8-7b.)
The butterfly valve in the exhaust wastegate assembly is set to a predetermined open and closed clearance.
A table of these clearances is given in Figure 8-7b for the specific engine being worked on. With 50-60 psi pres-
sure in the wastegate cylinder adjust the closed position (A) of the valve so that clearance between the butterfly
and side of housing is in accordance with specifications given in Figure 8-7b. After adjusting the closed posi-
tion and with no pressure in the wastegate cylinder, adjust the full open (B) position by adjusting the stop screw
to provide the specified clearance between the valve and the side of the housing with backlash taken up towards
the open position.
Revised: 9/24/81
POWER PLANT
PIPER NAVAJO SERVICE MANUAL
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