Checking The Cylinder Head - MOTO GUZZI stelvio 1200 NTX MY11 Service Manual

Engine
slid off the valve seats; unscrew the
tool and remove it from the head.
•
Slide off the upper cap (2).
•
Remove the spring (3).
•
Remove the lower cap (5) and the
valve guide oil seal (4), if necessary.
•
Remove the valve (6) from inside the
head.
Checking the valve guides
Use a punch to extract the valve guides from the heads.
The valve guides should be replaced only if the clearance between them and the stem cannot be elim-
inated by simply replacing the valves.
To refit the valve guides on the head, follow this procedure:
•
Heat the head in an oven at about 60°C (140°F).
•
Lubricate the valve guide.
•
Fit the circlips.
•
Press the valve guide with a punch.
•
Use a reamer to bore the holes the valve stems slide through so that the inside diameter is
at the prescribed value. The interference between the seat on the head and the valve guide
must be 0.046 - 0.075 mm (0.0018 - 0.0030 in)
Specification
Valve guide inside diameter
Valve stem diameter
Fitting clearance
VALVE GUIDE COUPLING - VALVES (OUTLET)
Specification
Valve guide inside diameter
Valve stem diameter
Fitting clearance

Checking the cylinder head

Check that:
•
the faying surfaces with the cover and the cylinder are not scored or damaged, jeopardising
a perfect sealing.
•
Check that the tolerance between the valve guide holes and the valve stems is within the
prescribed limits.
•
Check the valve seats are in good conditions.
ENG - 188
Revente Interdite - Revendita Vietata - Resaling Forbiden - Wiederverkauf Verboten
VALVE GUIDE COUPLING - VALVES (INLET)
Stelvio 1200 NTX MY11
Desc./Quantity
5.0 ÷ 5.012 mm (0.19685 ÷ 0.19732 in)
4.972 ÷ 4.987 mm (0.19574 ÷ 0.19633 in)
0.013 ÷ 0.040 mm (0.00051 ÷ 0.00157 in)
Desc./Quantity
5.0 ÷ 5.012 mm (0.19685 ÷ 0.19732 in)
4.960 ÷ 4.975 mm (0.19527 ÷ 0.19587 in)
0.025 ÷ 0.052 mm (0.00098 ÷ 0.00205 in)