Zontes ZT310M 2022, Руководство по обслуживанию

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Two, Maintenance information
General information
• This chapter introduces the maintenance of cylinders and pistons.
• The work of repairing cylinders and pistons requires removing the engine from the vehicle. (
Remove the engine
from the whole vehicle, refer to ZT310T-M Maintenance Manual-11
，
Remove the engine from the whole
vehicle )
• Remove the cylinder head cover. ( Refer to ZT310T-M Engine Maintenance Manual-Cylinder Head Cover,
Cylinder Head-Cylinder Head Cover for disassembly and assembly)
• Remove the tensioner. (
Refer to ZT310T-M Engine Maintenance Manual-Cylinder Head Cover, Cylinder Head-
Tensioner for disassembly and assembly )
• Disassemble the cylinder head sub-assembly. ( Refer to ZT310T-M Engine Maintenance Manual-Cylinder Head
Cover, Cylinder Head-Cylinder Head for disassembly and assembly )
• When disassembling the cylinder, avoid scratching the joint surface of the cylinder and the box to cause damage.
• When the cylinder and piston are separated, pay attention to protect the piston and connecting rod to prevent the
piston and connecting rod from colliding with the box body and causing damage.
• After removing the piston, clean up the carbon deposits and dirt on the top, and be careful not to drop it into the box.
•Clean the disassembled parts and blow them dry, and then carry out the inspection work.
Specification
Unit: mm (in)
Item Standard value Maintenance limit
value
cylinder
the inside diameter of 71.990-72.005 (2.8342-2.8348) 72.055 (2.8368)
Outer roundness - 0.005 (0.002)
Taper - 0.005 (0.002)
Flatness - 0.005 (0.002)
piston
Piston ring
Piston pin
Piston outer diameter 71.965-71.980 (2.8333-2.8339) 71.90 (2.831)
Piston outer diameter
measuring point 8 (0.3150) from the bottom of the
skirt
-
Piston pin hole inner diameter 17.002-17.008 (0.6694-0.6696) 17.038 (0.6708)
Piston pin outer diameter 16.994-17.000 (0.6691-0.6693) 16.975 (0.6683)
The gap between the piston
pin hole and the piston pin 0.002-0.014 (0.0001-0.0006)
-
Clearance
between piston
ring and ring
groove First ring 0.02-0.06 (0.0008-0.0024) 0.115 (0.0045)
Second
ring 0.02-0.06 (0.0008-0.0024) 0.115 (0.0045)
Piston ring end
clearance
First ring 0.15-0.30 (0.006-0.012) 0.50 (0.0197)
Second
ring 0.30-0.45 (0.0118 -0.0177) 1.15 (0.0453)
Oil ring
(side rail) 0.20-0.70 (0.008-0.028)
-
Clearance between cylinder and piston 0.010-0.040 (0.0004-0.0016) 0.15 (0.0059)
Inner diameter of small end of connecting rod 17.010-17.017 (0.6697-0.67) 17.06(0.6717)
Clearance between connecting rod and piston pin 0.010-0.023 (0.0004-0.0009) 0.06(0.0024)