Checking Valve Springs; Checking Valve Spring Seat; Checking The Cylinder Head - KTM 400 EXC AUS 2011 Repair Manual

301ENGINE - WORK ON THE INDIVIDUAL PARTS
133
400373-10
Cbackina valva
~rinp
Cbackina valva
~rina
seat
- Check sealing seat
e
on the valve.
Valve
Intake sealing seat width 2.00 mm (0.0787 in)
Valve
Exhaust sealing seat width 2.00 mm (0.0787 in)
•
If the sealing seat is not centered on the valve seat or deviates from the specifi-
cation:
- Rework the valve seat.
- Check the valve springs for breakage and wear (visual check).
• If the valve spring is broken or worn:
- Change the valve spring.
- Measure the length of the valve springs.
Valve spring
Intake minimum length (without
valve spring seat)
Valve spring
46.5 mm (1.831 in)
Exhaust minimum length (without 43.0 mm (1.693 in)
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 0.9 ... 1.0 mm (0.035 ... 0.039 in)
• If the measured value does not meet specifications:
' -_ _ _ _ _ _ _ _ _ _ = 50::0:.:1.:.:73=--O:::1:.J -
Change the valve spring seat.
- Check the exhaust valve guides using special tool
e.
I
Limit plug gauge (77029026000)
(00-
p. 259)
• If the special tool is easy to insert into the valve guide:
- Change the valve guide and valve.
- Check the intake valve guides using the special tool.
I
Limit plug gauge (59029026006)
(00-
p. 256)
• If the special tool is easy to insert into the valve guide:
- Change the valve guide and valve.
- Check the sealing area of the spark plug thread and the valve seats for damage and
tearing.
• If there is wear or tearing:
- Change the cylinder head.
301ENGINE - WORK ON THE INDIVIDUAL PARTS
133
400373-10
Cbackina valva
~rinp
Cbackina valva
~rina
seat
- Check sealing seat
e
on the valve.
Valve
Intake sealing seat width 2.00 mm (0.0787 in)
Valve
Exhaust sealing seat width 2.00 mm (0.0787 in)
•
If the sealing seat is not centered on the valve seat or deviates from the specifi-
cation:
- Rework the valve seat.
- Check the valve springs for breakage and wear (visual check).
• If the valve spring is broken or worn:
- Change the valve spring.
- Measure the length of the valve springs.
Valve spring
Intake minimum length (without
valve spring seat)
Valve spring
46.5 mm (1.831 in)
Exhaust minimum length (without 43.0 mm (1.693 in)
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 0.9 ... 1.0 mm (0.035 ... 0.039 in)
• If the measured value does not meet specifications:
' -_ _ _ _ _ _ _ _ _ _ = 50::0:.:1.:.:73=--O:::1:.J -
Change the valve spring seat.
- Check the exhaust valve guides using special tool
e.
I
Limit plug gauge (77029026000)
(00-
p. 259)
• If the special tool is easy to insert into the valve guide:
- Change the valve guide and valve.
- Check the intake valve guides using the special tool.
I
Limit plug gauge (59029026006)
(00-
p. 256)
• If the special tool is easy to insert into the valve guide:
- Change the valve guide and valve.
- Check the sealing area of the spark plug thread and the valve seats for damage and
tearing.
• If there is wear or tearing:
- Change the cylinder head.