9/26/2017
Service Manual Model J
http://www.sky-net.org.uk/kelvin/diesel/j_range/man/index.html
9/17
50. MAGNETO, CARE OF.--Allow no oil to drip on to the magneto as this causes
rapid wear of the platinum contacts. The magneto requires only three drops of oil once
a month.
51. MAGNETO SETTING.--If the magneto is removed it must be re-set as follows -
(a) turn the engine until No. 1 Cylinder blows at the sparking plug; (b) adjust mark on
fly wheel central; (c) remove door from magneto case also covet from end of
magneto; (d) lay No.1 sparking plug on top of magneto and oscillate armature by
gearwheel until plug sparks; (e) mesh gearwheel so that break occurs when mark on
flywheel is central.
52. MAGNETO CONTACT BREAKER.--The moving arm of certain makes is
liable to become stuck in damp climates owing to the swelling of its fibre bush.
Remove the arm, polish and oil the pin; scrape out the fibre bush with the square tail
of a small file or other suitable instrument. The fibre pad on the end of the arm should
be oiled, but no oil must reach the platinum contacts. If any spare parts are carried a
complete contact breaker should be included.
53. MAGNETO CONTACT BREAKER GAP.--The contact points are platinum
tipped and gradually wear further apart with the result that the gap increases. A gauge
is attached to the magneto spanner; try it in the gap, and, if necessary, adjust the
screw. If the contact points wear rapidly
.
54. MAGNETO DISTRIBUTOR.--Some distributors have carbon brushes which
wear. The dust produced must be removed from time to time. When the brushes are
worn down they should be renewed. The stretching of the spring serves temporarily in
taking up wear.
55. MAGNETO REPLACEMENTS.--Owing to the great variety of magnetos which
we have been obliged to supply, we cannot keep stock of all magneto
replacements,and buyers are advised to communicate direct with the magneto maker,
taking care to quote the number of the magneto if it bears one. A magneto sent to the
maker should be labelled with the owner's name and its despatch advised to the maker.
BOSCH MAGNETOS.
Bosch Limited,
Larden Road, Acton,
London, W.3.
SIMMS MAGNETOS.
Simms Motor Units Ltd.,
Oak Lane,
East Fincley,
London, N.2.
LUCAS MAGNETOS.
Joseph Lucas, Ltd.,
Great King Street,
Birmingham, 9.
B.T.H. MAGNETOS
British Thomson Houston
Co., Ltd.,
Alma Street,
Coventry.
56. IMPULSE STARTER PRINCIPLE.--Revolving with the magneto are two
pawls. These project when the engine is turned and recede when it attains about 100
r.p.m. The projecting ends of the pawls engage with a latch which arrests the rotation
of the armature and stretches a pair of springs. At a certain point the latch releases the
pawl and the springs impart to the armature a rapid motion which causes the magneto
to produce a spark however slowly the engine is turned.
57. IMPULSE STARTER TEST.--When the engine is turned by hand, the impulse
starter should produce a click. The action may be observed by removing the cover
