190
ADJUSTMENT
F 273 F 274 F 275
INSPECTING THE TENSION OF ENGI-
NE BELT
The correct tension of each belt is as-
sured when the belt is deflected 7,5 mm
after pushing on the belt by force 25 N.
Adjust the tension of belt to prescribed
value after loosening the fixing screws
(1, 2).
TENSION OF ENGINE BELT
At tractors Z 1
1641 the correct tension is
when the belt is deflected 25 mm after
pushing on the belt by force 50 N.
TIGHTENING THE CYLINDER HEADS
Cylinder heads are tightened at cold
engine in the prescribed sequence.
Tractor Type Z 8621 - Z 10641 - (A)
Torque 160 - 180 Nm
Valve
clearance 0,25“ 0,05 mm
Tractor Type Z 11641 - (B)
Torque 1. first 19Nm
2. than 50 Nm
3. subsequently
tighten by 90„ “ 5ř)
Valve
clearance
0,30“ 0,05 mm
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