Royal Enfield 500 TWIN 1949, Руководство по техническому обслуживанию мастерской

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ROYAL ENFIELD WORKSHOP MANUAL
20. Cleaning the Oil Filters
The oil filter is in the return oil circuit and is
located in the oil tank at the back of the
crankcase.
The filter element is removed by unscrewing
the nut holding the end cap in position. When
re-assembling the filter after cleaning, take care
that no grit or other foreign matter is sticking to
it.
The felt element should be taken out and
washed in petrol after the first 500 miles and
after every subsequent 2,000 miles. Fit a new
element every 5,000 miles.
On some models the oil filter is in the oil feed
to the big ends instead of the return circuit and
is located in the bottom of the timing cover
instead of in the oil tank.
21. 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; the plungers 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 No. E.5425, using
carborundum 360 fine paste or liquid metal
polish, until an even grey surface is obtained.
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.
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
oilcan. 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.
When the timing cover has been refitted on
the engine, the oil feed to the big ends can be
checked by partially unscrewing the feed plug in
the timing cover between the oil pumps and the
oil return to the tank can be checked by
removing the oil filler cap. The feed to the
rockers can be observed by removing the rocker
box covers, when oil will be seen flowing down
the push rods.
The pump drive is by means of a double-start
worm so that the pump runs at 1/6 engine speed.
On earlier models a single-start worm was
used, giving a pump speed of 1/12 engine speed.
The two are interchangeable but, if a
singlestart worm is replaced by a double-start
worm, the pump spindle must also be changed or
damage will be caused.
On the pump spindle mating with the
doublestart worm the tooth angle is 6.1/2° to the
axis of the shaft, while in the case of the single
start it is 3.1/4°.
22. Removal of Timing Chains
"Meteor." Loosen the magdyno fixing
bolts.
Remove the magneto sprocket. (See
Subsection 25.)
Lift the magneto chain off the cam sprocket.
Remove the chain tensioner securing bolt
and the anchor plate held by two screws.
Withdraw the chain tensioner fulcrum pin.
Remove the chain tensioner arm and
sprocket. Lift the chain off the cam sprockets.
"500 Twin." Loosen the magneto fixing
bolts.
Remove the magneto sprocket. (See
Subsection 25.)
Lift the magneto chain off the cam sprocket.
Loosen the chain tensioner locknut and stud.
Lift the adjusting plate clear of the chain
tensioner spindle.
Remove the chain tensioner spindle and
sprocket.
Lift the chain off the sprocket.
23. Removal of Pump Worm and Timing
Sprocket
Remove the timing chains (Subsection 22).
Unscrew the oil pump worm by means of the
hexagon head behind it. This is a Left Hand
Thread.
Withdraw the timing sprocket using special
tool No. E.4869. Do not attempt to withdraw
the sprocket by tapping the worm, as this will
dislodge the locking nut in the crankshaft.
(See Section D.1, Subsection 7.)
24. Removal of Camshaft Sprocket
Remove the timing chains (Subsection 22).
Unscrew the camshaft sprocket fixing bolt,
which has a left hand thread, at the same time
holding the sprocket.
Withdraw the sprocket by means of a
suitable extractor.
25. Removal of Magneto Sprocket
Magdyno. The sprocket is mounted on a
smooth taper on the magneto shaft and is held in
position by a nut
(Right Hand Thread). To
Section C1 Page 7
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