Checking The Cylinder Head - MOTO GUZZI B043157 Service Station Manual

Engine
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 approximately 60°C (140°F).
•
Lubricate the valve guide.
•
Fit the circlips.
•
Press a punch with the valve guides.
•
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
Specification
Valve guide inside diameter
Valve stem diameter
Fitting clearance

Checking the cylinder head

Check that:
•
The planes of contact with the cover and with the cylinder are not scored or damaged so as
to compromise a perfect seal.
•
Check that the clearance between the valve guide holes and valve stanchions is within the
prescribed limits.
•
Check the status of the valve seats.
INLET VALVE SEAT DETAIL DRAWING
ENG - 240
VALVE GUIDE COUPLING - VALVES (INLET)
VALVE GUIDE COUPLING - VALVES (OUTLET)
Moto Guzzi California 1400
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)