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32
MIKRON III A
ANNEX 2
12.2 Ignition Magnetos Repairs, Disassembly and Assembly
The Maintenance organizations and Personell without special
Authorization may carry out the minor maintenance of that
part of the Ignition Magneto, covered by the detachable cover
of the distributor, The cover and the distributor space may
be cleaned, the cover, the central brush, the contact finger
and contacts of the distributor checked for cracks, wear and
damage. The damaged parts may be replaced, the moderately
worn/burned contacts may be grinded-in and adjusted on the
determined clearance.
The Major Maintenance of the Ignition Magnetos is limited to
the Engine Manufacturer or specially authorised Maintenance
Organization.
Magneto is removed from the engine after disconnection of
the ignition cables and releasing the fastening sleeve. The
nut, fastening the magneto drive insert, is released and the
whole assembly of the magneto including the insert and bevel
gear is removed and haded-over for the necessary maintenece.
The required play in the -bevel gear drive is determined by
the distance between the bevel gear and the insert and must
be adjusted by the magneto maintenance organization.
The Magneto Reassembly and Timing Adjustment
Adjust the crankshaft to the upper compression stroke of the
cylinder No 1 (i.e. the "valve shear" on the No 4 cylinder).
The divider finger is adjusted to the ignition point of the
cylinder No 1 according to the marking on the divider cover.
Check the clearance in the magnetic drive gearing as follows.
Insert the magnetos without the sealing in such a way so that the
line connecting the magneto axis and the IIshort-circuiting"
terminal includes at the ignition spark point an angle within
20-30 degrees with the logitudinal axis of the engine.
In this position, tighten slightly the nuts fastening the engine.
If the drive gearings of the magnetos bear on each other and there
is a gap between the bearing surface of the magneto drive insert
and the bearing surface the crankcase measure its width using
a feeler gauge.
.
Depending on the gap width, select 1,2 or 3 sealings so that the
total width of the sealing (one sealing
0.3 mm) would be by 0.2
bigger as minimum. Remove the magneto, put in the determined number
of sealings and mount it back in the same position.
When assembled, tighten it.
NOTE: ·In case of SCINTILLA magnetos the one provided with the
impulse coupling (the longer one) is installed on the engine
right side.
Issued 9/95
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