Page 73 - Vauxhall 20-60 H.P. (R Type) Chassis Shop Manual

VAUXHALL 20-60 SHOP MANUAL

– Remove the thrust screw7 in the commutator end of the armature shaft.
Then by tapping the commutator end of the armature shaft it can be
removed from the yoke together with the driving end bracket.

– Remove the bearing from commutator end bracket. To remove the
bearing from the driving end bracket it is necessary to remove the three
rivets that secure the housing to the bearing plate.
– Remove the four screws fixing the commutator end bracket to the yoke.
Release the eyelets on the leads from the field coils.
– Remove pin from bearing collar on the driving end of the shaft. Unscrew’
bearing collar. Remove sleeve, pinion, and spring from shaft.

INSPECTION

SECTION – Examine bearings. These should rotate freely and quietly. If rough or
372 radially slack they should be renewed.

The bearings should be packed with a good quality high melting point
grease. Examine commutator. If blackened it should be cleaned in the same
manner as the dynamo commutator ( Section 363 ).

TO RE-ASSEMBLE AND REPLACE

SECTION Reverse operations detailed in ( Sections 371 and 370 ) respectively.
373
ELECTRIC HORN ( Before R 2836 )

SECTION Description — On cars bearing chassis numbers prior to R 2836 the horn is
374 of the single terminal earth return type and mounted on the engine rocker

cover, and the horn push is situated on the instrument board, to the right
of the steering column.

ELECTRIC HORN ( After R 2835 )

SECTION On and after chassis number R 2836 the horn is a two terminal insulated
375 type and the horn push is situated in the centre of the steering wheel.

ADJUSTMENT
( See Figure 16 )

SECTION Should the electric horn give a harsh or otherwise unsatisfactory note,
376 proceed as follows:— Remove the back cover from the horn by inserting a

screwdriver in the slot at the bottom of the cover and prise it off. Slacken
the locking nut

‘A’ and turn the adjusting screw ‘B’ in a little at a time until the required
note is obtained. Finally tighten the locking nut ‘A’. Under no circumstances
should the screw ‘C’ be interfered with. A sudden and complete failure of
the horn is most likely due to a loose terminal connection or a short circuit,
in which case the wiring and terminal connections should be inspected.

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