Zontes ZT310M 2022, Maintenance Manual

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Tool
1. Clamp pliers
2. Needle-nose pliers
3. Vernier caliper
4. Plug gauge
5. Roundness meter
6. Straightedge
Three, troubleshooting
1. When the engine is running at low speed, the compression pressure is too low, it is
difficult to start or the performance is poor.
• The cylinder wall is worn, cracks appear on the top of the piston or the cylinder block wall is scratched.
• The piston ring is worn or cracked.
• The connecting rod is bent.
• The cylinder head valve is leaking.
2. The pressure of the engine is too high during compression, and it will make a knocking
sound during operation.
• Excessive carbon deposits on the top of the piston or in the combustion chamber.
3. Abnormal engine noise.
• The piston ring is broken.
• The piston ring is worn or the cylinder wall is scratched.
• Piston ring carbon deposits or piston ring groove wear.
• The piston pin or piston pin hole is worn.
• The piston ring sticks to the piston ring groove.
4. The engine produces obvious smoke.
• The cylinder and the piston pull the cylinder, the piston is damaged or the coating film of the cylinder falls off.
• The cylinder, piston or piston ring is worn.
• The piston ring installation position is incorrect.