DAELIM DAYSTAR -, Service Manual

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9-1
Cylinder / Piston
9. Cylinder / Piston
Service Information
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9-1
Troubleshootint
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9-1
Cylinder
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9-2
Piston
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9-3
Piston/Cylinder Installation
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9-5
Service Information
Geaneral
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When removing the cylinder, avoid damaging the cylinder joint part with a driver or cooling pin by
hitting the cylinder strongly.
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Avoid damaging the inside of the cylinder and piston surface.
Lower or uneven compression
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Worn piston
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Worn, damaged piston rings.
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Worn cylinder.
Excessive smoke from muffler
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Worn cylinder, piston, and piston rings.
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Improperly installed piston rings.
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Damaged piston, cylinder.
Overheating
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Excessive carbon deposits on piston head.
Piston noise
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Worn cylinder and piston.
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Worn piston pin, connecting rod small end.
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Damaged piston rings.
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Excessive carbon deposits on piston head.
Troubleshooting
Item Standard Service Unit
I.D 56.500-56.510(2.2244-2.2248) 56.60(2.228)
Cylinder Outer of round
───
0.1(0.004)
Taper
───
0.05(0.002)
Warpage
───
0.1(0.004)
Piston O.D. 56.470-56.490(2.2232-2.2240) 56.37(2.219)
Piston pin hole I.D 15.002-15.008(0.5906-0.5909) 15.04(0.592)
Piston Piston Pin O.D 14.994-15.000(0.5903-0.5906) 14.96(0.589)
Piston Pin Piston pin-to-piston clearance 0.002-0.14(0.0001-0.0006) 0.02(0.001)
and Piston ring-to-groove top 0.015-0.045(0.0006-0.0018) 0.09(0.004)
Piston Ring clearance second 0.015-0.045(0.0006-0.0018) 0.09(0.004)
Piston ring top/second 0.10-0.25(0.004-0.010) 0.5(0.02)
end gap oil(side rail) 0.2-0.7(0.01-0.03) 1.1(0.04)
Piston-to-cylinder clearance 0.010-0.040(0.0004-0.0016) 0.15(0.006)
Connecting rod small end I.D. 15.010-15.028(0.5909-0.5917) 15.06(0.593)
Connecting rod small end-piston pin clearance 0.010-0.034(0.0004-0.0013) 0.04(0.002)
Specifications
Unit: mm(in)
9