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F. Apply torque seal to the torqued hold-down nuts on the magneto clamps.
G. Turn the crankshaft a few degrees in the direction opposite normal rotation. The timing lights
are to indicate the magneto is not firing.
H. Slowly turn the crankshaft in the direction of normal rotation until the correct advance timing
mark on the starter ring gear support assembly (Figure 1) aligns with the reference point on
the engine (Figure 1 or 2). Both lights on the timing light are to indicate the magnetos are
firing.
I. Adjust the magneto-to-engine timing until repeat checks by the "Magneto-to-Engine Timing
Check" in this chapter are within tolerance.
4. Magneto Replacement Procedure
WARNING BEFORE THIS PROCEDURE, MAKE SURE ALL POWER IS DISABLED TO
THE ENGINE TO PREVENT ELECTRICAL SHOCK AND INJUIRY.
NOTICE: Magneto configurations are different between magneto suppliers. This procedure
applies to Slick magnetos only. Refer to the manufacturer's instructions for other types
of magnetos.
A. Magneto Removal
(1) Disconnect the ignition harness cap from the magneto per the "Ignition Harness
Removal" procedure in Chapter 74-20.
(2) Disconnect any other wires connected to the magneto.
(3) Hold the magneto and remove the nuts, lock washers, washers, clamps, cotter pin, gear
nut, and magneto gear from the magneto. Discard the lock washers.
(4) Remove the magneto.
(5) Remove and discard the gasket.
B. Magneto Installation
A new or serviceable magneto, new magneto gasket, and two new lock washers are necessary
to install the magneto. Refer to the applicable parts catalog.
(1) Apply a light coat of C5-A Copper-
Based Anti-Seize compound to the
tapered section of the magneto
driveshaft (Figure 3).
(2) Install the magneto gear on the
magneto driveshaft.
(3) Remove excess C5-A Copper-
Based Anti-Seize compound from
the magneto driveshaft.
(4) Install the gear nut and washer on
the magneto gear. Torque the gear
nut per the magneto manufacturer's
instructions.
74-30
Page 172
YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
Figure 3
C5-A Copper-Based Anti-Seize Application
© 2021 Avco Corporation. All Rights Reserved
February 2021
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