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IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
(7) Install a timing pin (Figure 13) in the hole marked Left or Right on the face of the
distributor block based on the magneto rotation requirements.
(8) Apply a slight inward pressure to the pin and slowly turn the magneto drive shaft in
the direction of normal rotation until the shoulder of the pin seats against the
distributor block. When correctly engaged, the timing pin will be inserted 7/8 in. (22
mm) into the distributor block.
(9) If not already done, turn the crankshaft in the direction of normal rotation until the
correct advance timing mark on the starter ring gear support aligns with the reference
point on the engine (Figures 8 or 9).
(10) Apply Lubriko
mating flange of the magneto.
(11) Remove the timing pin and install the magneto on the engine with the clamp, nuts,
and new lock washers (Figure 13).
(12) Torque the two nuts on the magneto clamps to 48 in.-lb. (5 Nm) in increments,
alternating between the two nuts until both nuts are torqued to 15 to 18 ft.-lb. (20 to
24 Nm).
(13) Connect the harness to the magneto.
(14) Complete the "Magneto-to-Engine Timing Check" in this chapter.
© 2020 Avco Corporation. All Rights Reserved
March 2020
Figure 13
Timing Pin
®
M-6 grease to the mating flange and install a new gasket on the
74-30
Page 289
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