Section G. Maintenance Belarus– 510/512 Operating manual
90
Operation 17. Checking clearances be-
tween valves and rockers
NOTE:
Check the clearances on a cold engine, first checking tightening of the cylinder
head bolts.
To perform the adjustment, proceed as
follows:
• remove the cylinder head cover cap
and check the fastening of the rocker
axle rests. The nut tightening torque
must be 60 to 90 N•m (6 to 9 kgf•m);
• crank the engine crankshaft until the
moment of closing of the valves of the
1st cylinder (the intake valve starts
opening, the exhaust valve finishes
closing) and adjust clearances in the
4th, 6th, 7th and 8th valves (counting
from the fan);
• to adjust the clearance, loosen the
locknut (1) of the screw (2), insert
the feeler (5) between the face of
valve rod (3) and the rocker head
(4) and set the required clearance
against the feeler by turning in or
out the screw (2).
The clearances between the rocker
head and the valve rod face on a cold
engine for intake and exhaust valves are
specified in the table below:
• turn the crankshaft through 360°, set
the valve closing at the 4th cylinder
and adjust clearances in 1st, 2nd, 3rd
and 5th valves as shown above;
• after adjustment of the clearances,
tighten the locknuts (1) and refit the
removed parts.
Belarus 510/512
Intake valves
Exhaust valves
0,20.. .0,35
0,20.. .0,35
