Royal Enfield 350 BULLET 1949 Скачать руководство пользователя

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ROYAL ENFIELD WORKSHOP MANUAL

place a tray under the engine to catch the oil
from the chaincase.

Beneath the bottom run of the chain is a

curved  slipper  on  which  the  chain  rests  and
which  may  be  raised  or  lowered  by  turning  the
adjusting  screw  after  having  first  slackened  the
locknut.

The chain should be adjusted so that there is

¼ in. up and down movement at the centre of the
top run of the chain.

After replacing the chain cover, remember to

replenish the chaincase with oil.

20. Removal of the Engine Sprocket

The primary chain is endless and it is

therefore necessary to remove both the engine
and clutch sprockets simultaneously.

Unscrew the engine sprocket nut so that the

engine sprocket, which is mounted on splines,
can then be removed with the clutch sprocket (on
some early models the sprocket was mounted on
a taper instead of splines).

To remove the clutch sprocket unscrew the

three  clutch  spring  pins  and  lift  away  the spring
cap,  springs  and  distance  pieces,  clutch  front
plate,  centre  or  plate  retaining  ring  and  the
assembly of the driving and driven clutch plates.
The clutch sprocket can then be withdrawn from
the clutch centre after removal of the large circlip
which secures it.

21. Removal of the Tappets and Guides

It is only necessary to remove the tappets and

guides if they have become worn.

To remove the guides use Special Tool No.

E.5410.

The guide should have an interference fit of

.0015 in. to .0025 in. in the crankcase and can be
driven  in  with  a  bronze  drift,  care  being  taken
when  the  guide  is  nearly  home  to  avoid
damaging  the  collar.  Excessive  hammering  may
close  up  the  bore  of  the  guide  which  would
necessitate  removing  the  tappet  and  reaming
again.  In  no  circumstances  should  the  guide  be
reamed in position on the 350cc. engine as swarf
might get into the recess in the guide.

22. Dismantling the Breather

If the breather is not operating efficiently, it

may cause pressure in the crankcase, instead of a
partial vacuum, giving rise to smoking or
overoiling.

500cc. Engine. See that the discs and

backplate are clean and undamaged and that the
discs are seating properly.

When re-assembling the breather, apply

jointing compound very sparingly to the back of

the steel plate taking great care to keep it away
from the discs or their seatings

350cc. Engine. Unscrew the body of the

breather and examine the disc. If it is faulty, a
new breather unit should be fitted as the disc
cannot readily be taken out of the body.

23. Removal of the Clutch

Remove the engine sprocket and clutch

sprocket together as described in Subsection 20.

To remove the clutch centre, hold the clutch

with Special Tool No. E.4871, and remove the
centre retaining nut and washer with a box
spanner.

The clutch centre can then be withdrawn

from the shaft with Special Tool No. E.5414.

If the circlip is not removed the sprocket and

clutch centre can be removed together.

24. Removal of the Final Drive Sprocket

Remove the clutch as described in Subsection

23.

Remove the primary chain tensioner.
Remove the rear half of the primary

chaincase by taking out three socket screws.

Remove the grub screw locking the final

drive sprocket nut.

Hold the sprocket and remove the nut (Right

Hand Thread). The sprocket can then be
withdrawn.

25. Pressure Relief Valves

There are two Pressure Relief Valves in the

oil  feeds  to  the  big  end  and  to  the  rocker  gear
respectively.  Their  function  is  to  prevent
excessive  pressure  and  their  setting  is  not
critical. The feed to the rocker gear comes from
the return oil from the crankcase to the tank.

The pressure relief valves are set before

leaving  the  Works  and  should  not  normally
require  to  be  disturbed.  If,  however,  it  is  found
necessary  to  dismantle  either  of  them,  they  can
be reset as follows:

Rocker Feed Relief Valve

. This is located on

the  outside  of  the  crankcase  immediately  below
the  lower  end  of  the  external  oil  pipe.  It  has  a
hexagon  head  and  can  be  removed  complete  by
unscrewing it out of the case.

The valve itself cannot be dismantled and, if

found to be faulty, should be replaced by a new
one.

Big End Relief Valve.

This is located in the

timing-side crankshaft and can only be adjusted
when the crankshaft has been dismantled. It
consists of a 5/16 in. diameter steel ball and
spring held in position by a screwed plug.

Section C2 Page 6

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