Zontes ZT310M 2022, Руководство по обслуживанию

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3. Before disassembling, remove the foreign matter and dust on the cylinder head cover and the joint surface of the
cylinder head.
4. After disassembling the cylinder head cover, before disassembling the cylinder head, check the timing first and turn
the piston to the top dead center.
5. When disassembling, the disassembled parts should be installed in a clean box and marked to prevent wrong
installation during assembly.
6. When disassembling the cylinder head, first remove the two M8×110 hexagon flange bolts on the side, and finally
remove the 4 M10×1.25 hexagon flange nuts on the cylinder head.
7. When disassembling the cylinder head, it is forbidden to bump or scratch the joint surface of the cylinder head.
8. When disassembling the cylinder head, the cylinder block and cylinder head gasket cannot be reused to prevent
blow-by and air leakage.
Bolt torque value
Bolt type Assembly position Quantity
Torque
(N•m)
Remarks
M6×30 Hexagon Flange Bolt - 8 12±1.5 -
M8×110 Hexagon Flange Bolt Cylinder head bolt 2 21±2 -
M10×1.25 Hexagon Flange Nut Cylinder head nut 4 52±5 -
M6×10 top pin bolt - 12 10±1 -
M6×22 Hexagon Flange Full Thread Bolt Thermostat locking bolt 2 12±1.5 -
M6×16 hexagon flange bolts - 3 12±1.5 -
M5×15
－
5# Hexagon socket screw
Rocker arm limit block
locking bolt
2 7±1
Need to
apply thread
glue
LMAR8A-9 spark plug - 1 14±1 -
Specification
Project Standard value Maintenance limit value
Intake and exhaust rocker
shaft Diameter 11.973-11.988 mm
（
0.4714-
0.4720 in
）
11.942 mm
（
0.4702 in
）
Intake rocker arm sub-
components The inside
diameter of 12-12.018 mm
（
0.4724-0.4731
in
）
12.033 mm
（
0.4737 in
）
Exhaust rocker arm sub-
components The inside
diameter of 12-12.018 mm
（
0.4724-0.4731
in
）
12.033 mm
（
0.4737 in
）
Matching clearance
between intake and
exhaust rocker arm and
intake and exhaust rocker
arm shaft Fit clearance
0.012-0.045 mm
（
0.0005-0.0018
in
）
0.08 mm
（
0.0032 in
）
Intake and exhaust valve
springs Free length 35.5-36.5 mm
（
1.3976-1.4370
in
）
33.7 mm
（
1.3268 in
）
Camshaft tip height Inlet tip height 39.996-40.116 mm
（
1.5746-
1.5794 in
）
39.896 mm
（
1.5707 in
）
Exhaust tip height 39.946-40.066 mm
（
1.5727- 39.846 mm
（
1.5687 in
）