URAL Motorcycles 750cc Series User Manual

Before installing the cylinder head cover in place, lubricate the rockshafts through the central oil
ho les in the s ha ft.
Removing and Reinstalling the Cylinder
(the engine may be le ft o n t he moto rcycle, wit h the cylinde r head re move d)
Required tools:
- Crank handle 345-316-3 for cra nk ing t he cr a nksha ft;
- Device 346-692 for compressing the piston rings when fitting the cylinder.
- Distance bar 346-697
To remove the cylinder:
- Set the piston in the T. D. C. position using kick-starter lever or crank handle 345-316-3 with
the gearbox removed. (Fig.1)
- Turn off the cylinder fastening nuts, move the cylinder away (without jerks) by slightly rocking
it and taking care not to damage the paper gasket, remove the cylinder;
- If necessary, remove the cylinder gasket.
Having removed the cylinder remove the deposits from it, wash, inspect and measure the
cylinder bore. If necessary, repair (refer to Repairing the Cra nk Mec ha nism).
To install the cylinder:
- Put the paper gasket on the cylinder fastening studs, paying special attention to that the cylinder
gasket does not overlap the hole for oil feed and drain.
- Put distance bar 346-697 between the piston and the engine crankcase (See Fig.2)
- Insert de vice with its ho le o nto e ithe r stud a nd co mpre ss the p isto n r ings. (See F ig.2 ). p ut the
cylinder onto studs, insert piston head into the cylinder and move the cylinder into the distance
bar until it stops.
- Remove distance bar 346-697, undo the nut of device 346-692 and remove it.
Make sure that the sealing caps of the push rod tubes are correctly positioned (the arrow marked
on the sealing cap should be in top position) and tightly fitted in place.
Re moving a nd Re ins talling the Piston a nd Pisto n Rings
(The engine may be left on the motorcycle, with the cylinde r re move d)
Required tools:
- Device 345-439-3 to press out the piston pin
- Pisto n ring re mover 34 6-066-3;
- Mandrel 346-035 and tapered tip for mounting the piston pin.
To remove the piston and piston rings:
- Mark the position of the piston;
- Remove the piston pin circlips;
- Fit the re mo ver 345- 439-3 and pres s o ut the p isto n p in (F ig.3);
- Re mo ve the too l a nd take out t he pisto n;
- Re mo ve the p isto n rings with the he lp o f remo ve r 346-066-3 (Fig. 4).
Make sure to mark the piston rings when removing them, so as to reinstall the rings, when
assembling, exactly in the same position (into the respective piston grooves and with their
respective end faces pointing up), as otherwise the oil consumption will sharply rise and remain
so until the rings are embedded in the new position.
Ha ving d is mantled t he p isto n a nd p isto n rings, c lea n the m o f carbo n, espe c ia lly in the groo ve s
which house the piston rings, wash, inspect thoroughly and make the required measurements. If
necessary, replace the worn out parts (refer to Repairing the Crank Mechanism).
Reassemble the piston and piston rings in the following seque nce :
28

URAL Motorcycles 750cc Series Specifications

General

Brand	URAL Motorcycles
Model	750cc Series
Category	Motorcycle
Language	English