Rockwell Commander 112 - Installation

SECTION IV
POWER PLANT
AND PROPELLER
MAINTENANCE MANUAL
ROCKWELL
COMMANDER
112/B/TC /TCA
2 . Exhaust manifold segments - Secure.
3 . Alternator - Secure.
4. Oil drain valve - Secure.
5. Oil temperature bulb installed.
6. Cylinder head temperature adapter and
thermocouple on left rear cylinder.
7. Spark plugs - torque top plugs to 360-420
inch-pounds, bottom plugs finger tight only
(lower
spark plugs torqued after engine preoil-
ing procedure) .
8. Fuel pump - Secure.
9. Vacuum pump - Secure.
10. Propeller governor - Secure.
11. Inspect engine assembly for missing or
loose nuts and screws.
INSTALLATION
MODELS 112/B. During engine installation coat the
male threads of fuel fitting with a fuel soluble lubricant
such as engine oil. Use no other form of thread com-
pound on fuel fittings. All other male thread fittings
should be coated with anti-seize compound prior to
connecting hoses and lines. It is recommended that
engine mount pads be replaced at each routine engine
change. The engine
oil cooler must be soaked in
cleaning solvent and cleaned by Circulating solvent
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 engine, 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 hoi st.
Use caution when installing engine to
mount to prevent damage to airframe
and engine mount.
c .
Remove covers from cylinder exhaust ports and
install aft exhaust stack segments.
d. Connect following lines to engine:
1. Oil pressure gage line.
2. ManUold pressure, fuel flow pressure
and vent lines.
3. Fuel supply line.
4. Vacuum inlet and outlet lines.
e. Install induction air box to servo regulator.
f. Connect tachometer flexible drive to engine and
tachometer.
g. Connect throttle and mixture control cables to
servo regulator.
h. Connect electrical wiring to engine.
4-24
i. Attach engine ground wire.
j. Connect propeller control cable to propeller
governor.
k. Install oil cooler oil lines.
1. Install cowling.
m. Install propeller (see Propeller Installation in
structions in this section).
n. Install and torque lower spark plugs to 360-420
inch- pounds.
o. Add engine
oil (see Figure 4-12 for approved
weight).
p.
Turn propeller by hand five or six revolutions.
q. Rig engine controls and check for free move-
ment and full travel range, however do not operation-
ally check engine at this point.
r. Inspect following items:
1. Alternator and magnetos in place and
tight.
2. Fuel flow divider valve, injection lines,
and air bleed nozzles secure.
3. Engine controls properly connected.
4. Exhaust system; clamps tight, secure at
outlet port.
5. Induction air filter clean and induction
air box secure.
6. Engine baffles secure.
7. Engine baffle seals free from breaks
and cuts.
8. Engine compartment for loose objects
(rags, tools, etc.).
9. Cowling and access doors secure and free
from cracks.
10. Fuel filter and screens cleaned, installed,
and safetied.
11. Fuel cells for sufficient fuel and fuel
sumps drained.
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 10-hours of engine
operation to assure that all preservative is out of the
oil system.
Never run engines with cowling
removed.
MODELS 112TC/TCA. During engine installation,coat
the male threads of fuel fittings with a fuel soluble
lubricant such as engine oil. Use no other form of
thread compound on fittings. All other male thread
fittings should be coated with anti-seize compound
prior to connecting hoses and lines. It is recommend-
ed that engine mount pads be replaced at each routine
engine change. The engine oil cooler must be soaked
in cleaning solvent and cleaned by circulating solvent
Copyright Commander Owners Group 2013 All Rights Reserved
**unofficial copy**