Belarus 892 - Page 255

892-0000010B OM
255
The gap between face of rocker arm and face of valve stem, when checked on a cold
engine D-245.5/D-245.5C (coolant and oil temperature shall not exceed 60 С) shall make:
1) intake valves –
05,0
10,0
25,0


mm.
2) exhaust valves –
05,0
10,0
45,0


mm.
When adjusting, set the gap between face of valve stem and face of rocker arm on a
cold engine D-245.5/D-245.5С as follows:
1) intake valves –
05,0
25,0

mm;
2) exhaust valves –
05,0
45,0

mm.
Adjust in the following order:
- remove the caps of cylinder head covers and check the tightening of bolts and nuts
of rocker arm shaft bracket’s fastening;
- turn the crankshaft through until valves in the first cylinder are blocked (the intake
valve of the first cylinder starts opening, and the exhaust valve has finished its closing) and
adjust gaps in the fourth, sixth, seventh and eighth valves (counting from the fan), then turn
the crankshaft by one revolution by installing a shut-off in the fourth cylinder, and adjust the
gaps in the first, second, third and fifth valves.
To adjust the gap, release, in accordance with Figure 6.4.34, locknut 3 of adjusting
screw 1 on the rocker arm of adjustable valve, and by turning the screw set the necessary
gap according to clearance gauge 2 between rocker arm face and valve stem face. After
setting the gap, tighten the nut. After finishing to adjust the gap in the valves, place back the
cap of cylinder head cover.
1 – adjusting screw; 2 – clearance gauge; 3 – locknut.
Figure 6.4.34 – Adjustment of gaps in valves
6.4.4.14 Operation 43. Check and adjustment of axial preload in conical bearings of
the pivot
Note – Operation shall be carried out only for BELARUS-892.2 tractor
Before check and in case it is necessary to make adjustment of axial preload in taper
bearings 6 (Figure 6.4.35) of the pivot to do the following preparatory works:
- clear out FDA from dirt;