Checking The Valve Guides; Checking The Cylinder Head; Valve Guide Coupling - Valves (Inlet); Valve Guide Coupling - Valves (Outlet) - MOTO GUZZI NORGE GT 8V Service Station Manual

Norge GT 8v

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
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.
INLET VALVE SEAT DETAIL DRAWING
Revente Interdite - Revendita Vietata - Resaling Forbiden - Wiederverkauf Verboten

VALVE GUIDE COUPLING - VALVES (INLET)

VALVE GUIDE COUPLING - VALVES (OUTLET)

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)
Engine
ENG - 191