Ignition And Electrical System Ignition Harness And Wire Replacement; Timing Magneto To Engine - Textron Lycoming IO-540 Series Operator's Manual

TEXTRON LYCOMING OPERATOR'S MANUAL
0-540 & 10-540 SERIES SECTION 5
MAINTENANCE PROCEDURES
The procedures described in this section are provided to guide and in-
struct personnel in performing such maintenance operations that may be
required in conjunction with the periodic inspections listed in the preceding
section. No attempt is made to include repair and replacement operations
that will be found in the applicable Textron Lycoming Overhaul Manual.
1. IGNITION AND ELECTRICAL SYSTEM.
a. Ignition Harness and Wire Replacement - In the event that an igni-
tion harness or an individual lead is to be replaced, consult the wiring
diagram to be sure harness is correctly installed. Mark location of clamps
and clips to be certain the replacement is clamped at correct locations.
b. Timing Magnetos to Engine (Bendix) -
(1) Remove a spark plug from No. 1 cylinder and place a thumb over
the spark plug hole. Rotate the crankshaft indirection of normal rota-
tion until the compression stroke is reached, which is indicated by
a positive pressure inside the cylinder tending to push the thumb
off the spark plug hole. Continue rotating the crankshaft until the ad-
vance timing mark on the front face of the starter ring gear is in align-
ment with the small hole located at the two o'clock position on the
front face of the starter housing. (Refer to Specification chapter or
to engine name-plate for designated number of degrees of spark ad-
vance.) At this point, the engine is ready for assembly of the
magnetos.
(2) Single magneto - Remove the inspection plugs from both magnetos
and turn the drive shaft in direction of normal rotation until (-20 and
-200 series) the first painted chamfered tooth on the distributor gear
is aligned in the center of the inspection window (-1200 series) the
applicable timing mark on the distributor gear is approximately aligned
with the mark on the distributor block. See figure 5-2. Being sure
the gear does not move from this position, install gaskets and
magnetos on the engine. Note than an adapter is used with all
magnetos. Secure with (clamps on -1200 series) washers and nuts;
tighten only finger tight.
5-1