Overhaul Of Oil Pumps; Removal Of Pump Worm And Timing Pinion; Removal Of The Magdyno Pinion; Primary Chain Adjustment - Royal Enfield 350 BULLET 1949 Workshop Maintenance Manual

ROYAL ENFIELD WORKSHOP MANUAL
The filter element is removed by unscrewing
the nut holding the end cap in position. When
reassembling the filter after cleaning, take care
that no grit or other foreign matter is sticking to it.
After emptying the filter chamber it is essential to
run the engine slowly for about five minutes to
ensure that oil is reaching the big ends. If the
timing cover has been removed, fill the filter
chamber with clean oil before replacing the cover.

16. Overhaul of Oil Pumps

Remove the timing cover, as described in
Subsection 1.
Remove the end plates from both pumps.
Remove the pump discs and plungers.
Remove the pump spindle which can be
pulled out from the front or return pump end.
Check the fit of the plungers in the pump
discs which should have a minimum of clearance
but should be able to be moved in and out by
hand.
If, when fitting a new disc or plunger, the
plunger is found to be too tight a fit, carefully lap
with metal polish until it is just free. If the pump
disc is not seating properly or if a new pump disc
is being fitted, it should be lapped to the seating
with Special Tool
carborundum 360 fine paste or liquid metal
polish, until an even grey surface is obtained.
Replacement pump discs have a lip left on the
flat, at the opposite side to the lapped face. The
purpose of this is to hold the disc central in the
housing during lapping-in. It should be filed off
before the pump is finally assembled, care being
taken not to damage the lapped face.
Wash all passages, etc., thoroughly with
petrol after lapping to remove all traces of
grinding paste.
Check the pump disc springs for fatigue by
assembling in the timing cover and placing the
pump covers in position. The latter should be
held 1/8 in. off the timing cover if the springs are
correct.
In the case of the 500 c.c. engine see that the
steel end pads are in position on the outer ends of
the springs.
The pump spindle should be renewed if
excessive wear has taken place on the teeth.
Re-assemble the oil pumps, replacing the
paper cover gaskets if necessary. Before fitting
each cover fill the pump chamber with clean oil.
Having assembled the pumps, lay the timing
cover flat and fill the oil ports by means of an oil-
can. Turn the pump spindle with a screwdriver in
a clockwise direction looking on the front and it
can then be seen whether the pumps are operating
correctly.
Before replacing the timing cover on the
engine, fill the filter chamber with clean oil.
No. E.5425, using
The oil feed to the big end can be checked by
partially unscrewing the feed plug in the timing
cover between the oil pumps while the engine is
running and the oil return to the tank can be
checked by removing the oil filler cap.
17. Removal of Pump Worm and Timing
Pinion
Remove the timing cover as described in
Subsection 1.
Unscrew the worm shaft by a hexagon head
behind the worm, using Special Tool No. E.5451.
This is a Left Hand Thread.
Withdraw the timing pinion by means of a flat
chisel placed behind the pinion and tap gently.
When refitting the timing cover see that the
cork plug is in position in the hole in the pump
worm and is undamaged.

18. Removal of the Magdyno Pinion

Remove the timing cover and take off the
hexagon nut holding the pinion.
Extract the pinion with the Special Tool
supplied with tool kit.
To take up slack in the primary chain, unscrew the
locknut and turn the adjuster beneath the curved
slipper until correct chain tension is obtained; re-
tighten the locknut.

19. Primary Chain Adjustment

Access to the primary chain adjuster is gained
by removing the primary chain cover, which is
held in position by a single nut. Before removing
the nut
Section C2 Page 5