Royal Enfield CONSTELLATION 1958, Workshop Maintenance Manual

Page: 38 / 106

aluminium from stripping.
The method of fitting the thread inserts is the
same as that used for the sparking plug inserts
described in Subsection 14.
33. Rocker Oil Feed Relief Valve
There is a pressure relief valve in the oil
supply to the rocker gear, whose function is to
prevent excessive pressure and whose setting is
not critical.
The valve is located in the crankcase face
behind the timing cover and consists of a 3/16
in. diameter steel ball held in position by a
spring and a brass plug.
The valve is set before leaving the Works and
should not normally require to be disturbed but,
if it is found necessary to dismantle it, it can be
reset by screwing the plug in until it is flush with
the face of the crankcase, which will cause the
pressure to be relieved at approximately 10 lbs.
per square inch. The plug is prevented from
moving by peening over the aluminium into the
screwdriver slot with a small centre punch.
34. Fitting the Alternator
The alternator consists of two parts, the
stator and the rotor. The stator of 1960 models
is mounted on to the three studs of the adaptor
ring, which in turn is secured to the back half of
the primary chaincase by three screws.
On earlier models the stator is of greater
diameter and mounted on to the primary
chaincase with three studs and distance pieces.
The rotor, which contains the permanent
magnet, is mounted on the end of the crankshaft
and is located by a key and secured by a special
bolt and spring washer on 1960 models, and by
a nut and tab washer on earlier models.
The radial air gap between the rotor and the
poles of the stator should be .020 in. in all
positions and care must be taken when refitting
to see that it is not less than .010 in. at any point.
Fit the rotor first, making sure that it is
located concentrically on the end of the
crankshaft. Attention must be given to the
seating of the key because a badly fitting key
may cause the rotor to run unevenly. Finally
secure the rotor with the appropriate bolt or nut
and washer.
Having fitted the rotor, secure the adaptor
ring of 1960 models with the three
cheese-headed screws, and shakeproof washers,
or, in the case of earlier models, place the three
distance pieces over the three chaincase studs.
The stator may then be fitted, with the coil
connections facing outwards.
Replace the nuts and shakeproof washers
only fingertight, and insert six strips (preferably
of nonmagnetic material) .015 in. thick and
about 1/8 in. wide between the rotor and each
pole piece.
Tighten the stator nuts and withdraw the
strips.
Check the air gap with narrow feelers and, if
less than .010 in. at any point, remove the stator
and file or grind the pole piece carefully until
the correct gap is obtained.
An alternative, and more satisfactory,
method of assembling the alternator requires the
use of Special Tool No. T2055.
This is a gauge .015 in. greater in radius than
the rotor and fits over the adaptor on the end of
the crankshaft in the rotor's place.
The stator is then put in position on the studs
in the chaincase and the nuts tightened up.
Remove the gauge and fit the rotor, then
check the air gap.
Section C11 Page 9
www.hitchcocksmotorcycles.com