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ADJUSTMENT - TM-55-4920-426-13-P0262
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TM-55-4920-426-13-P Gasoline Engine Driven Hydraulic Systems Test Stand Type Type D5-D P/N 79009-100 NSN
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MAGNETO REPLACE Continued
TM 55-4920-426-13&P
3-156
MAGNETO REPLACE
3-156
This task covers:
Removal and Installation
INITIAL SETUP
Materials/Parts
Tools
Personnel Required
Kit, NSN
Magneto, P/N Y98C.
63B Wheel Vehicle
Gasket, P/N QD616.
Mechanic
1. REMOVAL
Remove access panel.
a.
Remove the four ignition leads from the magneto.
b.
c.
Remove screws securing two wires to the stop switch on the magneto.
d.
Remove mounting hardware securing magneto to engine.
2. INSTALLATION
Remove three screws over the flywheel air intake opening. This will expose timing marks on flywheel
a.
and shroud.
Remove the No. 1 cylinder plug, Hold finger over spark plug hole and rotate engine slowly, so that
b.
compression stroke can be determined by air blowing out the hole.
Align edge of circulating vane marked with an X, to the mark on vertical center line on shroud, see
c.
illustration.
Remove fitting from inspection hole located on gear cover at magneto mounting flange.
d.
The Number 1 cylinder firing position of the magneto must be determined; Insert the ignition cable
e.
into the No. 1 tower terminal of the magneto end cap and hold the spark plug terminal at the other
end, about 1/8" away from the magneto body. Turn the magento gear in a clockwise rotation, tripp-
ing the impulse coupling, until the No. 1 terminal sparks, then hold the gear in this position. Mount
the magneto the to engine, meshing the gears so that when the magneto is in place, the gear tooth
marked with an `X' will be visible through the lower half of the inspection hole in the gear cover.
Tighten the nut and capscrew for mounting the magneto, making sure the magneto flange gasket is
in place.
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