Hisun HS700UTV-4, Maintenance Handbook

Page: 161 / 388

ENGINE
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• valve stem runout
Out of specification Replace.
Runout limit 0.01 mm
1 NOTE
:
• When installing a new valve always replace
the guide.
• If the valve is removed or replaced always
replace the oil seal.
• The valve seat surface width
Out of specification Reface the valve seat.
Repairing limit value
2.0mm
a. Install the valve into the cylinder head.
b. Press the valve through the valve guide and
onto the valve seat to make a clear pattern.
c. Measure the valve seat width. Where the
valve seat and valve face made contact,
blueing will have been removed.
• Valve spring free length
• Valve spring squareness
Out of specification Replace.
Valve spring free length
Intake:32.5mm Exhaust:36.2mm
Valve spring squareness
Intake:0.10mm Exhaust:0.10mm
• compressed spring force(a)
Out of specification Replace.
(b) Installed length
Compressed spring force
Intake: 100.0 ~ 115.7 N at 27.5 mm
Exhaust: 120.6 ~ 138.3 N at 31.0 mm
2). Remove:
• valve guide