Royal Enfield CO, Руководство по техническому обслуживанию мастерской

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ROYAL ENFIELD 350cc O.H.V. WORKSHOP MANUAL
Page 10
LOOSENING MAGNETO PINION
Fig. 8
set the magneto control to full advance turn the engine
backwards until the piston has descended 3/8 in. and
turn the contact breaker forwards (clockwise viewed
from contact breaker end) until the points are just
about to open. With the engine and contact breaker in
these positions, tap the timing pinion lightly on to its
taper and lock by means of the timing pinion nut.
Check the timing after tightening the nut to make sure
that it has not moved.
When replacing the timing cover rotate the
engine so as to ensure easy engagement of the
worm gears which drive the oil pumps. It is
important to use a timing cover joint washer of the
correct material and thickness. Make sure also that
the cork oil seal which fits inside the pump driving
worm is in good condition.
ADJUSTING TAPPETS
Fig. 9
12. Tappet Adjustment.
Access to the tappet adjustment is obtained by
removing the inspection cover from the side of the
cylinder. The exhaust tappet should have .004 in.
clearance; the inlet .002 in., when the engine is cold.
Owing to the ball and socket joint at the bottom of the
push rods it is not possible to use feelers at these
points. To check the clearance accurately the rocker
box cover must be removed and the feelers applied
between the ends of the valve stems and the rockers.
With a little experience, however, the correct tappet
clearance can be obtained by feel, the inlet push rod
being just free while the exhaust has perceptible up
and down clearance.
To make the adjustment (see Fig. 9) hold the
push rod bottom end (top hexagon) and the locknut
(middle hexagon). Unlock by turning the locknut to
the left and make the adjustment by screwing the
push rod cup (bottom hexagon) to the left to take up
clearance or to the right to give more clearance, at the
same time holding the push rod bottom end. Finally,
lock up the locknut against the push rod end and
check the clearance after finally tightening the
locknut.
COMPLETE OVERHAUL.
13.
Removal of Engine from Frame.
To remove the engine from the frame, first take
off the petrol tank, carburettor, exhaust pipe and
silencer. Next remove the left footrest and the outer
half of the primary chain case, taking care to allow as
little oil as possible to come in contact with the
rubber sealing band. Unscrew the nut securing the
engine sprocket ; disconnect the front chain and
withdraw the engine sprocket from its taper, using an
extractor similar to that shown in Fig. 10. Dismantle
ENGINE SPROCKET EXTRACTOR
Fig. 10
the clutch (see Para. 32) and unscrew the main clutch
securing nut (placing the machine in top gear and putting
on the brake to prevent the mainshaft turning). Withdraw
the clutch centre from its splines by means of an
extractor as shown in Fig. 11. Remove the rear chain,
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