Zontes ZT310M 2022, Руководство по обслуживанию

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1.5774 in
）
Camshaft Camshaft runout - 0.03mm
（
0.0012 in
）
Matching clearance
between valve stem
diameter and valve guide
Intake 0.01-0.037 mm
（
0.0004-0.0015
in
）
0.08 mm
（
0.0032 in
）
Exhaust 0.025-0.052 mm
（
0.0010-
0.0020 in
）
0.1 mm
（
0.0039 in
）
Valve stem diameter Beat - 0.01 mm
（
0.0004 in
）
Tools
1. Pliers.
2. T-sleeve -8#.
3. T-type sleeve -10# / torque 10# sleeve.
4. T-type sleeve-14# / torque 14# sleeve.
5. 5# Inner hexagon.
6. 6# inner hexagon.
7. 10# inner hexagon.
8. The valve spring is placed on top of the clamp.
9. 22# open-end wrench.
10. 17# Torx wrench.
11. Spark plug sleeve.
Three, Failure phenomenon / failure analysis
When the engine cylinder head fails, it will affect the performance of the engine, and at the worst, it will be difficult to
start the engine. The fault can be eliminated by detecting cylinder pressure, endoscope and other methods.
1. When the engine starts, the idle speed is unstable or difficult to start.
• The valve clearance is incorrect.
• Wrong timing, wrong teeth.
• The valve spring is broken.
• The valve is not closed tightly and leaks air.
• The spark plug has serious carbon deposits and insufficient ignition energy.
• The spark plug is loose and leaking.
• Blow-by of cylinder block and cylinder head gasket.
2. There is abnormal noise after the engine is running.
• The valve clearance is incorrect.
• The valve spring is broken.
• Worn valve seat.
• The camshaft slinger is broken.
• The camshaft bearing is worn or damaged.
• The tensioner is damaged.
• Worn or damaged intake and exhaust valve rocker arm bearings.
• The rocker arm limit block is broken.
• Excessive carbon deposits in the engine and deflagration.
3. After the engine warms up, the exhaust gas is abnormal.
• The valve stem diameter oil seal is worn or damaged.
• The valve guide is worn or damaged.