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17 ENGINE
Minimum length, inner
39.20 mm (1.5433 in)
intake valve
Minimum length, outlet
40.40 mm (1.5905 in)
valve
If the measured value does not meet specifications:
- Change the valve springs.
17.4.23 Checking the valve spring seat
305014-10
17.4.24 Checking the cam levers
302718-10
17.4.25 Checking the cylinder head
310348-10
202
- 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 seat - thick
ness
1.40 ... 1.60 mm (0.0551
0.063 in)
If the measured value does not meet specifications:
- Change the valve spring seat.
- Check the cam levers and cam lever shafts for damage and
wear.
If there is damage or wear:
- Change the cam levers and/or cam lever shafts.
- Check valve guides
O
using the special tool.
I Limit plug gauge (77229026000) (
0
p. 301)
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.