Rockwell Commander 112 - Engine Mount; Engine Mount and Cowling

SECTION IV
POWER PLANT
AND PROPELLER
MAINTENANCE MANUAL
ROCKWELL
COMMANDER
112/B/TC/TCA
through the cooler. Cooler must be completely drained
before installation. A clean air filter should also be
installed at time of engine installation. To install an
, proceed as follows:
a. Drain preservative oil from engine by turning
crankshaft three or four revolutions by hand. Tilt
engine from side to side to facilitate draining.
b. With engine hanging from hoist, align engine
to mount pads and install engine mount attach bolts.
Torque engine mount bolts to 450-500 inch-pounds.
Remove engine hoist.
Use caution when installing engine to
mount to
prevent damage to airframe
and engine mount.
c. Install turbocharger strut braces.
d. Install carburetor.
e. Install turbocharger pressure relief valve
elbow.
f. Connect oil lines to turbocharger.
g. Connect following lines to engine:
1 . Oil pressure gage line.
2. Manifold pressure, fuel pressure and
vent lines.
3 . Fuel supply line.
4. Vacuum inlet and outlet lines.
h. Connect tachometer flexible drive to engine and
tachometer.
i. Connect throttle and mixture control cables to
carburetor.
j. Connect electrical Wiring to engine.
k. Attach engine ground wire.
1. Connect propeller control cable to propeller
governor.
m. Install oil cooler oil lines.
n. Install propeller (see Propeller Installation
instructions in this section).
o. Install and torque lower spark plugs to 360-420
inch-pounds.
p. Add engine oil (see Figure 4-12 for approved
weight) .
q. Turn propeller by hand five or six revolutions.
r. Rig engine controls and check for free move-
ment and full travel range, however do not opera-
tionally check engine at this point.
s. Inspect following items:
1 . Alternator and magneto in place and tight.
2. Carburetor and primer lines tight.
3. Engine controls properly connected.
4. Exhaust system; secure and free of leaks.
5. Induction air filter clean.
6. Engine baffles secure.
7 . Engine baffle seals free from breaks and
cuts.
8. Engine compartment for loose objects
(rags, tools, etc.).
9. Fuel filter and screens cleaned, installed,
and safetied.
4-26
t.
10. Fuel cells for sufficient fuel and fuel
sumps drained.
Install cowling.
A new
engine has been carefully run-in and has passed
a rigid final test at the factory; therefore. no further
breakin is necessary. However, it is recommended
that ground operation of the engine be held to a min-
imum and engine should be operated at minimum RPM
during the first 10-hours of flight. Engine oil should
be changed and filters cleaned after lO-hours of engine
operation to assure that all preservative is out of the
oil system.
Never run engines with cowling removed.
INITIAL GROUND RUN. A newly installed engine re-
quires careful observation at the initial ground run.
If an engine instrument fails to operate within its nor-
mal range within the prescribed time, the engine
should be shut down immediately and an investigation
made. Special attention must be given to engine oil
pressure. If oil pressure is not within the normal
range immediately after engine start, stop engine
immediately and determine cause before attempting
another engine run. An observer should be located
at a safe distance from the engine to detect any un-
usual noise, vibrations, or fluid leakage during the
initial engine ground run.
a. Start and operate engine briefly then shutdown
engine and check for fluid leaks.
b. Restart engine and perform engine operational
check as outlined in Section II. Check for erratic
fuel pressure or oil pressure instrument readings
which may be caused by air in the instrument line.
ENGINE MOUNT AND COWLING
ENGINE MOUNT
The engine mount (Figure 4-10) is a welded tubular
structure attached to the firewall at five different lo-
cations. The structure serves as an engine mount and
nose gear mount. The mount has four points that the
engine attaches to and uses two rubber shockmounts
at each point. The engine mount to firewall bolts and
nuts should be tightened to a torque value of 160-190
inch- pounds.
NOTE
Whenever engine and nose landing gear
mount is removed and reinstalled or re-
placed Proseal No. 700 or equivalent
must be applied between the attach
washer and the firewall.
Copyright Commander Owners Group 2013 All Rights Reserved
**unofficial copy**