Piper Navajo PA-31 Service Manual page 536

PIPER NAVAJO SERVICE MANUAL
g. Disconnect the starter cable at the starter; remove the cable clamps at the left side of
the engine and engine mount, and draw the cable aft through the engine baffle to the fire
wall.
h. Disconnect the alternator primary cable that leads from the fire wall at the filter box
located on the right lower side of the engine mount. Disconnect the field wire.
i. Disconnect the electrical leads to the oil temperature sender at the accessory
housing, the cylinder heat temperature probe at the aft outboard cylinder and the exhaust
temperature at the aft side of the exhaust manifold, if installed.
j. Disconnect the magneto ground leads and the retard spark lead of the left magneto
at the magneto.
k. Disconnect the propeller deicer electrical wires (optional equipment).
l.
Disconnect the pressure pump hose at the upper left side of the fire wall.
m. Disconnect the tachometer drive cable at the engine accessory housing.
n. Disconnect the throttle and mixture control cables at the injector, the governor
control cable at the governor and the alternate air door control cable at the left side of the
air filter plenum. Disconnect the cables from their attachment clamps.
o. Disconnect the hydraulic pressure line at the hydraulic oil filter on the fire wall.
p. Disconnect the hydraulic suction, fuel supply, fuel flow, oil pressure, manifold
pressure and deicer (optional equipment) lines at the fire wall. Also remove the tailpipe
hanger 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.
8A-11. INSTALLATION OF ENGINE. 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,
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, oil pressure, manifold pressure
and deicer (if installed) lines to the fire wall fittings. Also connect the tailpipe hanger to the
fire wall.
d. Connect the hydraulic pressure line at 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 paragraph 8A-8.
Reissued: 10/12/79
POWERPLANT
2K14