Lycoming YO-233-B2A Maintenance Manual page 193

YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
(5) Install a new cotter pin through the gear nut and magneto driveshaft. Bend the top prong
on the cotter pin over the stud and bend the bottom prong of the cotter pin down.
(6) Verify the magneto direction of rotation as per the magneto data plate.
(7) Install a timing pin (Figure 4) in the hole marked Left 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 assembly aligns with the reference
point on the engine (Figures 1 or 2).
(10) Apply Lubriko
flange of the magneto.
(11) Remove the timing pin (Figure 4) and install the magneto on the engine with the clamp,
nuts, and new lock washers.
(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) Complete the "Magneto-to-Engine Timing Check" in this chapter again. Install the
timing pin back into the hole again to ensure the impulse coupling did not snap and to
verify the magneto position.
(14) Once the correct magneto-to-engine timing is complete, recording the timing.
(15) Apply Torque Seal to the magneto nuts in the locations shown in Figures 5A and B.
© 2021 Avco Corporation. All Rights Reserved
February 2021
Figure 4
Timing Pin
®
grease to the mating flange and install a new gasket on the mating
Figure 5A
Torque Seal on the Magneto Nuts
Figure 5B
74-30
Page 173