URAL Motorcycles 2000 -10 series, Руководство по ремонту, Страница: 106 / 193

When inspecting the gears, whether used or new, pay special attention to the condition
of their teeth faces, as even slight burrs and dents on a tooth will lead to noisy operation.
Burrs and dents should be smoothed with a fine stone.
If timing gears are out of tolerance, preference should be given to replacement of both
gears as a set, as a gear set is selected at the Manufacturing Works (by the sound of
their running). Replacement of a single gear is possible, provided the measured
backlash is then within limits.
Gear sets are selected according to crankcase "group" markings. The crankcase group
of each engine is stamped on the upper surface of the crankcase to the right of the
generator. Gear sets are marked on the gear faces.
Removing the camshaft:
1. Turn off the screws fastening the camshaft flange gaining access through the holes in
the timing driven gear.
2. Remove the camshaft by pressing it out with mandrel 345-327-3, inserting it into the
hole of removed guide of the left cylinder intake valve. turn the camshaft so the tool
can push on the intake lobe, then rotate the tool to push the camshaft out.
Having removed the shaft, wash the parts, inspect, and make necessary measurements.
The required tools are micrometers capable of measuring 0 to 1 inch / 0 to 25 mm and 1
to 2 inch/ 25 to 50 mm. Check the condition of the ball bearing at the camshaft front
end; lubricate the bearing with engine oil, and carefully turn it by hand. If there is any
perceptible notching of the races, change the bearing. Replace the camshaft, if the cam
wear surfaces or bearings are scored, pitted or worn beyond limits.
Maximum permissible wear of the rear bearing is 0.04 mm/0.2 in.
To reinstall the shaft, reverse the sequence of the operations. Prior to pressing-in,
lubricate the camshaft rear journal and the bearing with oil. Use mandrel 345-341-3 to
press in the camshaft with light blows, the mandrel being fitted on the shaft end and
thrusting against the gear hub.
As the gears mesh, ensure that the timing marks coincide.
Removing and Reinstalling the Tappets with Guides
(The engine may be left on the motorcycle, with the cylinder removed.)
The required tool is puller 345-331-3 for removing tappets.
To remove the tappets:
•
undo the stop screws
•
remove the tappets with guide making use of puller 345-331-3