NACIONAL MOTOR Derbi Euro 2, Руководство по ремонту

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9-1
STRIPPING DOWN THE
CYLINDER HEAD
- Drain the coolant liquid, removing
the hoses fitted to the water pump.
- Place a tray ready to catch the coo-
lant
- Remove the hose from cylinder
head to the radiator.
- Disconnect the electrical connector
spade on the temperature sensor.
- Disconnect the HT cable from the
spark plug cap and withdraw the
spark plug
- First slacken off and then extract in
this order, the M6 screws and then
the M7 nuts.
- Withdraw the cylinder head and
cylinder head gasket from the cylin-
der. Clean off the remains of the
gasket and coke deposits without
scratching or degrading the surfa-
ces.
- Using a feeler gauge and a straight
edge check the mating surfaces for
warping, both on the cylinder head
and on the cylinder.
Maximum permitted out of true:
0.1 mm.
- Follow the instructions given above for strip-
ping down the cylinder head, in reverse
order.
- Fit a new cylinder head gasket, first ensuring
that the mating surfaces are perfectly clean,
both on the cylinder head and on the upper
face of the cylinder. Do not apply any form of
sealant.
- Tighten the M7 nuts and then the M6
screws, and finally torque up to a torque set-
ting of 18 to 20 Nm following a cross pattern
sequence.
- Refit the hose between the cylinder head
and the radiator correctly.
- Fit a new spark plug.
- Reconnect the temperature sensor and
sparkplug electrical connections.
- Refill the cooling circuit with AGIP coolant,
and bleed the circuit (please refer to the spe-
cific section in this manual).
FITTING THE CYLINDER HEAD