Refitting the head and timing system components
• Carefully clean the head, removing any carbon
residues
• Check the perfect condition of the fitting surfaces
• Check that the O-rings are not broken, otherwise
replace them
• Screw the 4 head fixing nuts and tighten them in
crossed sequence to the prescribed torque
Locking torques (N*m)
Head fixing nuts: 10 ÷11 Nm
• Refit the head inside recirculation duct as shown
in the figure.
• Check that the O-Ring is in good working condi-
tion.
• Fit the coolant outlet union on the head with rel-
evant O-ring by tightening 2 screws to the prescri-
bed torque.
Locking torques (N*m)
Coolant outlet union fixing screws: 3 ÷ 4 Nm
• Introduce the air injector into the head.
Runner Purejet Engine
ENG - 25
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