Overhaul Manual
O-360 and IO-360 Series Engines
ring gear assembly in place if propeller
and spinner are to be installed later.
(3) Align the correct timing mark on the ring
gear with the mark on the starter
housing. See Figure 72-00-09.41.
(8) Install new belt to alternator pulley and
adjust alternator and/or brackets to
achieve proper alignment.
(4) Attach the timing indicator leads of the
magneto synchronizer (timing box) to
the magneto P-lead connections and
ground lead to an appropriate ground.
(9) Adjust belt tension to allow a midspan
deflection of 0.31” with a 14lb load.
(5) Rotate or adjust the magnetos until each
magneto synchronizer lights indicate
that the magneto points are just
opening.
NOTE:
An alternate method of checking belt
tension is to measure the torque
required to slip the belt at the small
alternator pulley. A new belt is
properly tensioned when 12 ft-lb ±1 is
required to cause it to slip.
(6) Snug the magneto nut (30, Figure 72-
00-09.40) and rotate the crankshaft
back a few degrees before the correct
timing. Slowly rotate the crankshaft in
the direction of rotation until the timing
lights simultaneously indicate the
magneto points are just opening.
(10) Torque and safety the 3/8-24 slotted
nuts (40) to 360 in-lb.
(11) Torque and safety all other attaching
hardware in accordance with values
listed in the Fits and Clearances section
of this manual.
(7) Repeat the process above for minor
adjustments as needed to achieve the
correct timing.
(8) Torque the magneto nut (30) to 200 in-
lbs.
(9) Remove the timing indicator leads of the
magneto synchronizer from the magneto
P-lead connections and ground lead.
Engine Removal
(1) Remove the engine from nose stand
and place horizontal on transfer cart.
(10) Install the spark plugs into the top and
bottom spark plug ports of each
cylinder. Torque to 420 in-lbs.
Reference SVMM01, Maintenance
Manual.
Final Magneto Timing and Adjustment
NOTE:
Magneto assembly to the engine is
outlined in the accessory installation
instructions of this section.
(11) Attach the harness leads. Refer to
wiring diagram Figure 02-00-00.10.
Secure to each spark plug.
(12) Install the clamps provided with the
harness kit to prevent wire chafing.
(1) Install the ring gear to the crankshaft
propeller flange and retain with one
slave bolt.
NOTE:
Assembly steps 10, 11 and 12 above
may be replaced by assembly of
dehydrator plugs if the engine will be
stored prior to engine test. In this
event, spark plug leads should be
neatly coiled and stowed with the
clamps for later assembly.
(2) Rotate the crankshaft, using ring gear,
to compression stroke of number one
cylinder.
NOTE:
It may be necessary to rotate the
crankshaft just beyond top dead center
to allow the magneto impulse
couplings to release. Upon release of
the couplings, rotate the crankshaft
back in the opposite direction, to
correct timing degree mark.
Storage After Assembly
If not immediately proceeding to engine testing
section, preserve the engine for storage per
instructions in the Preservation and Storage
section of this manual.
58
© March 2005 Superior Air Parts Inc.
72-00-09
Engine Assembly
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