Piper Navajo PA-31 Service Manual page 544

PIPER NAVAJO SERVICE MANUAL
o. Disconnect the hydraulic pressure line at the hydraulic oil filter on the fire wall.
p. Disconnect the hydraulic suction, fuel supply, fuel flow pressure, fuel pressure, air
deck pressure, oil pressure, manifold pressure, deicer (optional equipment) lines at the fire
wall.
q. Attach a one-half ton (minimum) hoist to the hoisting hooks and relieve the tension
on the engine mount.
r. Remove the nuts and washers from the bolts that attach the engine mount to the
fire wall.
s. Remove the engine mount mounting bolts and swing the engine a few inches from
the fire wall. Check the engine for any attachments remaining to obstruct its removal.
t. Swing the engine clear and place on a suitable support.
8B-10. INSTALLATION OF ENGINE. (Refer to Figure 8B-1.) The installation of either
engine is basically the same procedure, though the routing of some wires, cables, lines, etc.,
does vary between engines. Before starting, ascertain that all components of the engine such
as engine mount, turbocharger unit, exhaust stacks, etc., are installed.
a. With a one-half ton hoist (minimum) attached, swing the engine in position.
b. Align the mounting holes in the engine mount with the mounting holes in the fire
wall. Install the mounting bolts through from the aft side of the fire wall. Install washers
and nuts and torque.
c. Connect the hydraulic suction, fuel supply, fuel flow pressure, fuel flow, air deck
pressure, oil pressure, manifold pressure, and deicer (if installed) lines to the fire wall
fittings.
d. Connect the hydraulic pressure line at the hydraulic oil filter on the fire wall.
e. Connect the throttle and mixture control cables to the injector; install cable clamps
and rig per Adjustment of Throttle and Mixture Controls, Section VIII.
f. Connect the governor control cable to the governor; install cable clamps and bracket
and check rigging per Rigging and Adjustment of Propeller Governor, Section VIII.
g. Connect the alternate air door control cable to the air door control arm and adjust
the cable end on the control arm so that when the control knob in the cockpit is full in,
there will be approximately one-eighth inch between the control arm roller and the fully
closed door.
h. Connect the tachometer drive cable to the drive on the accessory housing.
i. Connect the pressure hose to the fitting on the upper left side of the fire wall.
j. Connect the propeller deicer electrical leads (if installed).
k. Connect the magneto ground leads and the retard spark lead to the left magneto.
1. Connect the electrical leads to the oil temperature sender at the accessory housing,
the cylinder head temperature at the probe at the aft outboard cylinder and the exhaust
temperature probe at the aft side of the exhaust manifold.
m. Connect the alternator primary cable to the filter box located on the lower right side
engine mount. Connect the field wire.
n. Route the starter cable through the lower side of the left aft engine baffle and attach
the cable end to the starter. Secure cable with clamps at the engine mount and the engine.
o. Ascertain that the magneto switches are off and install the propeller per Installation
of Propeller, Section VIII.
p. Install the proper grade and amount of engine oil.
Reissued: 10/12/79
POWER PLANT
2K22