Section 7. Maintenance Procedures
Belarus 80.1/80.2/82.1/82.2/82
Р — Operation and Service Manual
89
It is possible to adjust the valves by still
another method, namely:--
а) remove the hood of the cylinder head
cover;
b) check the rocker arm shaft support
attachment for tightening;
в) turn the crankshaft to a position
wherein the valves in the first cylin-
der are closed (No. 1 cylinder intake
valve just starts to open, while No. 1
cylinder exhaust valve is near the
bottom of its stroke) and adjust
clearances in Nos. 4, 6, 7 and 8
valves (count the valves starting
from the fan);
г) rotate the crankshaft one complete
turn more to close the valves in No.
4 cylinder and adjust clearances in
Nos. 1, 2, 3 and 5 valves.
On completion of the clearance adjust-
ment, refit the cover hood back in place.
When running a re-check on a cold die-
sel-engine, clearances of 0.20...0.35 mm
for intake and exhaust valves are per-
missible.
CHECK OF THE CYLINDER HEAD AT-
TACHMENT BOLTS FOR TIGHTENING
Check of the cylinder head bolts tighten-
ing is to be carried out immediately after
the running-in of a new tractor and, then,
every 1000 hours (during scheduled MS-
3) on a warmed-up diesel-engine, in the
sequence as follows:
а) remove the hood and the cylinder
head;
б) remove the shaft with the rocker-arm
and support assemblies;
в) use a torque wrench to check tight-
ening of all the cylinder head bolts in
the order illustrated in Fig. 36. Tight-
en to 19-21 kgf
•
m (190-210 N
•
m)
torque;
г) on completion of the cylinder head
bolt tightening check, reinstall the
assembled rocker-arm shaft and
make adjustment of a valve lash.
Reinstall the cylinder head and the
cover hood back in place.
Fig. 36
