Husqvarna SMS4, Workshop Manual

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F1.16 Part. N. 8000 H4704 (07-2010)
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ENGINE OVERHAUL
VALVE REmOVAL
• The following procedure is applied to all the valves and their
components.
• Before removing the inside components of the cylinder head
(e.g. valves, valve springs and valve seats), check for correct
valve sealing.
1. Check:
• Valve sealing
Loss of valve seal Check valve face,
valve seat and width of the valve seat.
a.
Pour a clean solvent "a" in the intake and exhaust ports.
b. Check the correct sealing of the valves.
• There should not be any leaks from valve seat "1" .
2. Remove:
• Valve collets "1" .
• Remove the valve collets compressing the valve spring with
the suitable tool.
3. Remove:
• Upper spring seat "1"
• Valve spring "2"
• Valve "3"
• Valve stem seal "4"
• Lower spring seat "5".
• Carefully locate the position of each component, so that it
can be installed in the original position again.