Checking Valve Spring Seat; Checking The Cylinder Head - Husqvarna FE 450 2014 Repair Manual

18 ENGINE
18.4.29
18.4.30
194

Checking valve spring seat

304679-10

Checking the cylinder head

304680-10
304681-10
Exhaust minimum length
(without valve spring
seat)
If the measured value does not meet specifications:
-
Change the valve spring.
-
Check the valve spring seat for breakage and wear (visual
check).
If the valve spring seat is broken or worn:
-
Change the valve spring seat.
-
Measure the thickness of the valve spring seat.
Valve spring
Valve spring seat
If the measured value does not meet specifications:
-
Change the valve spring seat.
-
Check exhaust valve guides
I Limit plug gauge (77029026000)
If the special tool is easy to insert in the valve guide:
-
Change the valve guide and valve.
-
Check intake valve guides
I Limit plug gauge (59029026006)
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 (59029041100)
Cylinder/cylinder head
sealing area distortion
If the measured value does not meet specifications:
-
Change the cylinder head.
40. 7 mm (1 .602 in)
1.8 mm (0.071 in)
O
using the special tool.
(!ill p. 318)
8
using the special tool.
(!ill p. 314)
(!ill p. 314)
� 0.10 mm (� 0.0039 in)