Crankcase; Ignition System - Lycoming IO-360-N1A Installation And Operation Manual

Crankcase

The crankcase (Figure 3) is made up of two casting halves attached by a series of through-studs,
bolts and nuts.
The crankcase forms the bearings for the camshaft. The camshaft operates the tappets which control
opening and closing of the intake and exhaust valves. The camshaft has an integral spur gear that
drives the propeller governor output shaft.
The main bearing bores are machined for precision-type main bearing inserts. The crankshaft main-
bearings are pairs of inserts installed in the crankcase at each journal.
The crankshaft (Figure 4) is within the crankcase. The crankshaft has journals to attach connecting
rods and pistons.
Oil is supplied through the propeller flange for a single-acting controllable pitch propeller.
Four oil nozzles supply oil for internal piston cooling

Ignition System

The all weather-shielded ignition system (Figure 5) includes:
 Eight spark plugs (two per cylinder)
 Ignition harness
 Two magnetos (identified in Appendix A).
One magneto can have one retard breaker magneto and one plain magneto. The plain magneto must
be grounded during the start cycle. The shafts in both magnetos rotate clockwise (when facing the
drive pad).
System Description
Page 2
Figure 3
Crankcase
IO-360-N1A Engine Installation and Operation Manual
© 2016 Avco Corporation. All Rights Reserved
Figure 4
Crankshaft
February 2016