PIAGGIO 500 cc, Service Manual

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05_174
05_175
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N.B.: If necessary, the head can be removed together
with the camshaft, equalizer pins and fixing bracket.
- Unloose the 4 head to cylinder fixing nuts in 2-3 times
in a crossed sequence.
- Remove the head, the 2 centering dowels, the gasket
and the lower chain guide shoe.
N.B.: Avoid removing the dowels if they are forced in a
housing.
- Collect the thermal unit coolant in a
suitable container when the head is disassembled
Warning
Valves disassembly
- Disassemble the cotters, caps, springs and valves by
means of the specific tool provided with an adapter.
Specific tool:
Valves disassembly tool
020382Y
Adapter 020382Y012
- Put the valves away in such a way as to
easily recognize their original position on the head
(flywheel side and transmission side)
- Remove the oil seals by means of the specific tool
Specific tool:
Oil seal extractor
020431Y
Warning
- Remove the spring supports
N.B.: Blow compressed air in the housings to facilitate
the spring supports removal.
Thermal unit and timing system