Checking The Cylinder Head; Valves, Installing - Husqvarna FC 250 2016 Repair Manual

17 .4.25

Checking the cylinder head

17.4.26

valves, installing

-
Check valve guides
I
Limit plug gauge (77229026000)
If the special tool is easy to insert in the valve guide:
-
Change the valve guide and valve.
-
Check the sealing area of the spark plug thread and the valve
seats from damage and cracking.
If there is damage or cracking:
-
Change the cylinder head.
-
Using a straightedge and the special tool, check the sealing
area of the cylinder for distortion.
I
Feeler gauge (590290411 00)
Cylinder/cylinder head -
distortion of sealing area
If the measured value does not meet specifications:
-
Change the cylinder head.
-
Check sealing seat
Valve - sealing seat width
Intake
Valve - sealing seat width
Exhaust
If the measured value does not meet specifications:
-
Rework the valve seat.
302808-10
-
Blow compressed air through all oil holes and check that they
are clear.
-
Position valve spring seat
-
Mount the valve corresponding to its installation position.
-
Mount the valve spring with the tighter coil facing downward
according to the built-in position.
Mount the valve spring retainers.
O
using the special tool.
(lll:!l p. 291)
(lll:!l p. 288)
s 0.10 mm (s 0.0039 in)
f)
of the valves.
1 .40 mm (0.0551 in)
1 .40 mm (0.0551 in)
O.
Mount valve stem seal@.
17 ENGINE
199