38 / 44
LIGHTING AND
101. DYNAMO—TO REMOVE AND
REPLACE.
Take off the connections from the dynamo
terminals.
Unscrew the hexagon headed nut from the
driving end cover of the Magdyno.
Slacken the two screws securing the band
clip, and draw the dynamo out of its
mounting.
When replacing, slide the dynamo through
the band clip so that fixing screw passes
through its hole in the end cover and the
gears mesh correctly.
Tighten the end nut and the band clip
fixing screws and remake the connections to
the dynamo terminals. Make certain that
!he dynamo is connected correctly, i.e., cable
from cut-out and regulator terminal “ D ” to
CO M M U TA TO R
B R U SH
Fig. 23.
Finally, screw the nut into its terminal.
99. PICK-UP.
Examine the pick-up or high tension
terminal (magneto end).
See that the carbon brush moves freely in
its holder, being careful not to stretch the
brush spring unduly.
While the pick-up is removed, clean the
slip ring track and flanges by holding a soft
cloth on the ring while the engine is slowly
turned by hand.
100. SPARKING PLUG.
Clean periodically by dismantling and re
moving all carbon from the electrodes.
Scrape inside of plug body clean of carbon,
re-assemble and set gap at .015"— .025".
ACCESSORIES.
dynamo terminal " 'D ' ” and cable from
cut-out and regulator terminal “ F ” to
dynamo terminal “ F.”
102. DYNAMO BRUSHES.
Test if brushes are sticking.
Clean with petrol, and if necessary ease the
sides by lightly polishing on a smooth file.
Replace brushes in their original positions.
If the brushes are worn so that the flex is
exposed on the running face, new brushes
must be fitted.
Brushes are pre-formed so that bedding to
the commutator is unnecessary.
A commutator .in good condition will be
smooth and free from pits or burned spots.
Clean the commutator with a petrol-
moistened cloth.
If this is ineffective, carefully polish with
a strip of very fine glass paper while rotating
the armature.
103. LUBRICATION.
About every 4,000-5,000 miles add a few
drops of good quality thin machine oil to
the lubricator on the commutator end
bracket. The bearing at the driving end is
packed with grease which will last until it
is necessary for the dynamo to undergo a
complete overhaul.
104. CUT-OUT AND REGULATOR
UNIT.
This unit (Fig. 24) which is housed be
neath the saddle, consists of the cut-out
removed from the old cable and bend back
the strands.
88