Move the piston of the cylinder being checked to TDC upon combustion stage: in this condition, all valves are closed and the
camshafts come in rest position and, therefore, free to rotate.
Install tool no.
88713.2087 (A) in the spark plug bore to determine the piston TDC, the gauges (B) on tool no.
88765.1690 and the timing check tool (C) no.
88765.1657 (degree wheel with graduated disk).
In this condition, with the piston of the horizontal cylinder at TDC with the valves fully closed as confirmed by the reading
on gauge (A), set the gauges (B) to zero.
Tension the belts to the specified value.
Turn the degree wheel (C) counter clockwise until the gauge dial (B), on the exhaust side, shows a lift of 1 mm.
Check that the value of the angular displacement read on the degree wheel (C) is the specified one.
Continue to rotate in the same direction until you obtain a lift of 1 mm on the intake side.
Check the angular value on the degree wheel.
Continue to rotate until you obtain an intake valve lift of 1 mm on the gauge (B), during closure of the valve for the compression
stroke.
Check the angular displacement value with the specified one.
Continue to rotate the degree wheel (C) counter clockwise until you obtain a lift of 1 mm of the exhaust valve, when opening
or closing the valve.
Check the angular displacement value against the specified value.
Repeat the procedure for the vertical cylinder.
A tolerance of ±3° is allowed in the values detected with the described procedure compared to the specified ones.
Remove the installed tools to check timing. Then tension the belts to the prescribed operation value.
In case of values different from the described ones, loosen the fixing screws (D) of the timing belt rollers and correct the
value detected by turning the ring nut of the timing shaft with the supplied wrench (E) no.
88713.1806.
Then block the three screws (D) retaining the timing belt roller to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm) and mark the
new position on the components.