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17 ENGINE
302808-10
17.4.27 Checking valve springs
304678-10
17.4.28 Checking valve spring seat
304679-10
17.4.29 Checking the cylinder head
- Check sealing seat
6)
on the valve.
Valve
Intake sealing seat width
Valve
Exhaust sealing seat width
2.00 mm (0.0787 in)
2.00 mm (0.0787 in)
If the sealing area is not in the center of the valve seat or deviates from the
specified value:
- 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
Exhaust minimum length (without
valve spring seat)
140. 7 mm (1 .602 in)
140. 7 mm (1 .602 in)
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
1.8 mm (0.071 in)
If the measured value does not meet specifications:
- Change the valve spring seat.
- Check exhaust valve guides
O
using the special tool.
I
Limit plug gauge (59029026006) (,r p. 221)
If the special tool is easy to insert in the valve guide:
- Change the valve guide and valve.
- Check intake valve guides
8
using the special tool.
I
Limit plug gauge (59029026006) (,r p. 221)
If the special tool is easy to insert in the valve guide:
- Change the valve guide and valve.
157
- 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.