Engine Sock Mounts; Replacing Engine Shock Mounts - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
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
paragraph 8-65.
f. Connect the governor control cable to the governor, install cable clamps and bracket and check
rigging per paragraph 8-26.
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 number six 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 paragraph 8-20.
p. Install the proper grade and amount of engine oil.
q. Connect the battery ground wire at the battery.
r. Turn on the fuel valve, open the throttle full and turn on the electric fuel pump and check the
fuel lines for leaks.
s.
Install the access plates on the engine nacelle and the cowling per paragraph 8-6.
t. Perform an engine operational check.
8-30. ENGINE SHOCK MOUNTS.
8-31. REPLACING ENGINE SHOCK MOUNTS. The engine shock mounts may be replaced with the
engine installed as well as removed from the airplane Refer to Figure 8-6 for the arrangement of the shock
mount assemblies. The top shocks are assembled so the silver colored shocks are aft and the gold colored
shocks are forward. The lower shock mounts are installed opposite of the top shock mounts. The procedure
described in this paragraph is with the engine installed.
a. Remove the engine cowling. (Refer to paragraph 8-6.)
b. Attach a one half ton (minimum) hoist to the engine hoisting hooks and relieve tension from the
shock mounts.
c. Loosen the upper shock mount attachment nuts.
d. Remove the lower mount attachment nuts, washers, forward shock mounts and spacers.
e. Remove the lower attachment bolts just far enough to allow the aft shock mounts to be removed.
The bushing in each lower mount must be removed with the bolt.
f. Raise the nose of the engine enough to remove the lower aft shock mounts and replace with new
ones.
Reissued: 9/23/80
POWER PLANT
2H18