BELARUS-
1523/1523В
/1523.3
/1523В.3
Scheduled Maintenance
259
AFTER EVERY 250 HOURS OF OP-
ERATION
, perform the previous main-
tenance procedures plus the followings:
Procedure 27. Checking the clear-
ances between the valves and the
rocker arms
Note:
The clearances should be
checked on a cold engine, having
checked preliminarily the cylinder head
bolts tightening (Procedure 42).
•
Remove the covers of the cylinder
heads.
•
Check the tightening of the bolts and
nuts which fasten the rocker-arm shaft
brackets (60...90 N
•
m).
•
Turn the crankshaft until the piston of
the first cylinder comes to a valve lap
position (where the inlet valve starts to
open, while the outlet valve completes
the closure).
•
Adjust clearances in 3, 5, 7, 10, 11
and 12 valves (to be counted from the
fan).
ATTENTION!
The clearances between
the end-faces of the valve stems (2)
and the rocking arm heads (3) shall be
0.25...0.30 mm for the inlet valves and
0.40...0.45 mm for the outlet valves.
•
Turn the crankshaft through 360°, first
having set the valve lap in the sixth
cylinder; then, adjust the clearances in
valve Nos. 1, 2, 4, 6, 8 and 9.
•
To adjust the clearance, slacken the
locknut (5) of the adjusting screw (4)
and set the required clearance against
a clearance gauge (1) by means of a
wrench and driver. After setting the
clearance, tighten the locknut and re-
check the clearance using the gauge.
•
On completion of the adjustment job,
refit all the parts removed.
Summary of Contents for 1523
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