301ENGINE
-
WORK
ON
THE
INDIVIDUAL
PARTS
147
Cbeckinl
valve
~
rinl
seat
500173-01
Cbackinllha
cam
lavars
301227-10
400375-10
400373-10
- 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.
1 Valve spring seat - thickness
11.4
...
1.5
mm
(0.055
...
0.059
in)
•
If
the measured value does not meet specifications:
- Change the valve spring seat.
- Check the cam levers and cam lever shafls for damage and wear.
•
If
there is damage or wear:
- Change the cam levers and/or cam lever shafts.
- Check the valve guides with the special tool
1
Limit
plug gauge
(59029026006)
(
--
p.
230)
•
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 seals from damage
and cracki
ng.
•
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.
1 Feeler gauge
(59029041100)
(
--
p.
230)
Cylinder/cylinder head - distortion of
sealing
area
0:
0.10
mm
(0:
0.0039
in)
•
If
the measured value does not meet specifications:
- Change the cylinder head.
- Check sealing seat of the valves.
Valve - sealing seat width
Intake
1.50
mm
(0.0591
in)
Valve - sealing seat width
Exhaust
1.50
mm
(0.0591
in)
•
If
the measured value does not meet specifications:
- Machine the valve seat.
-
Blowout
all oil holes with compressed air and check that they are clear.
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