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30/ENGINE - WORK ON INDIVIDUAL PARTS
108
19.12
Checking the valves
Info
The valve stem is chrome-hardened, and wear normally takes place in the valve guide.
200193-10
–
Check for valve retainer run-out.
Valves
Run-out on valve plate
≤
0.05
mm (
≤
0.002
in)
» If the measured value does not equal the specified value:
–
Change the valve.
400373-10
–
Check sealing seat
on the valve.
Valves
Sealing seat width, intake
1.50
mm (0.0591
in)
Valves
Sealing seat width, exhaust
2.00
mm (0.0787
in)
» If the sealing area is not in the center of the valve seat or if it differs from the
specified value:
–
Machine the valve seat.
19.13
Checking the valve springs
600280-01
–
Check the valve springs for breakage and wear (visual check).
» If the valve spring is broken or worn:
–
Change the valve spring.
–
Measure the valve spring length.
Valve springs
Minimum length of outside spring
39.20
mm (1.5433
in)
Minimum length of inside spring
36.45
mm (1.435
in)
» If the measured value does not equal the specified value:
–
Change the valve spring.
19.14
Checking the lower valve spring retainer
600281-01
–
Check the lower valve spring retainer for breakage and wear (visual check).
» If the lower valve spring retainer is broken or worn:
–
Change the valve spring retainer.
–
Measure the thickness of the lower valve spring retainers.
Lower valve spring retainer - strength
0.4… 0.5
mm (0.016… 0.02
in)
» If the measured value does not equal the specified value:
–
Change the valve spring retainer.
