Engine Removal; Engine Installation - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
d.
With the high RPM adjustment complete, the control system should be adjusted so that the
governor control arm will contact the high RPM stop when the cockpit lever is .062 to .125 inch from its
full forward stop, which is located in the control pedestal. To adjust the control lever travel, disconnect the
control cable end from the control arm, loosen the cable end jam nut and rotate the end to obtain the
desired lever clearance. Reconnect the cable end and tighten jam nut.
e.
It is usually only necessary to adjust the high RPM setting of the governor control system, as the
action automatically takes care of the positive high pitch setting.
8-27. ENGINE.
8-28. REMOVAL OF ENGINE. (Refer to Figure 8-6.) The removal of either engine is basically the same
procedure, though the routing of some wires, cables, lines, etc., does vary between engines. Each line should
be identified to facilitate reinstallation and covered, where disconnected, to prevent contamination.
a.
Turn off all cockpit switches and then disconnect the battery ground wire at the battery.
b.
Move the fuel valve control lever located on the outboard side of the fuel selector panel, labeled
"Emergency Fuel Shut-off," to the OFF position.
c.
Remove the engine cowling per paragraph 8-6.
d.
Remove the access panels on the top, sides and inboard bottom of the nacelle, just aft of the fire
wall.
e.
Drain the engine oil, if desired, and reinstall drain plug.
f.
Remove the propeller per paragraph 8-18.
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 head temperature probe at the number six cylinder and the exhaust temperature at the aft side of
the exhaust manifold.
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).
1.
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 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.
8-29. 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 (Refer to
latest revision of Lycoming Servicing Instruction No. 1241 for Pre-Oiling), ascertain that all components of
the engine mount, turbocharger unit, exhaust stacks, etc., are installed.
Revised: 3/11/81
POWER PLANT
2H17