Chapter 4 Cylinder Head / Cylinder / Piston
Attention of Operation
• Can be operating when engine on the vehicle.
• Must cleaning before operating, avoiding dust enter to engine.
• Remove the gasket dust stay on joint face.
• When remove the cylinder, avoid to using screw driver to damage the joint face.
• Avoid to damaging the cylinder inner surface and piston face.
• Cleaning before check parts, and smear motor oil appointed in sliding face before
installation.
Diagnosis of Troubles
Low compression pressure, poor start, idle speed not stable
• Air leakage of the cylinder head gasket
• Wear out or damage of the piston ring
• Wrong installation of spark plug
• Wear out or damage of the cylinder and piston
• Reed valve is poor.
Compression pressure too high, overheating, locking
• Carbon accumulated on the cylinder head or piston top.
Piston knocking noise
• Wear out of the cylinder and piston
• Wear out of the piston pin hole and piston pin
• Wear out of the needle bearing of crank connecting rod (small end)
Piston ring noise
• Wear out or damage of the piston ring
• Wear out or damage of the cylinder
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