250 c.c. O.H.V. TWIN CYLINDER SCOOTER
RE-ASSEMBLY OF THE ENGINE, GEARBOX AND FINAL DRIVE UNIT
Before commencing re-assembly make sure that all the necessary gaskets, tab washers and woodruff keys
are available to replace any that have been damaged during dismantling.
Another essential is to ensure absolute cleanliness of all parts.
It is assumed that any bushes or bearings which needed replacement have already been fitted to the
block ; no further mention will be made of these except in special cases.
First the oil pump must be
assembled into the crankcase ; the
parts are fitted from the base, where
the sump is bolted to the crankcase
block.
Swing the connecting link down into the fork of the oil pump plunger, and insert the small hexagon
bolt with the tab washer underneath the head of the bolt. Lock the bolt securely and turn 'the tab
washer over on to the flat of the bolt and the flat of the oil pump plunger.
At this stage it is as well to check the action of the oil pump by filling the sump with clean oil.
Place the dip tube in the oil, screw the nut on the camshaft, and operate the pump by turning with a
spanner in a clockwise direction. High speed will not be necessary and if the pump is satisfactory oil will
be drawn up and ejected through the oilways of the crankshaft main bearing bush. If the oil pump fails to
function then the assembly procedure has been incorrectly carried out.
Insert the one thin steel washer with
the chamfered hole~ towards the base-
this provides the seating for the first
steel ball. Insert the ball, then the
spring and the spring seat so that the
counter bore engages correctly over the
spring and the chamfered hole is facing
the crankcase base to provide the
seating for the second steel ball. Insert
the second ball, the second spring and
finally the screwed plug, making sure
that it _ engages over the spring. Screw
it right home and see that it is below
the crankcase face. Centre punch the
edge of the screw and the face to
secure. Insert the plunger with the
fork end uppermost and the tapped hole
towards the back of the case.
Fig. 14. Oil pump.
Now insert the camshaft, making sure that the woodruff key is in position for the pump drive, place the
eccentric over the camshaft, then the connecting link over the eccentric, followed by the distance piece
and finally the elongated locking plate which is secured by two countersunk screws. Centre punch the
edge of the screws and the plate to secure.
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