Toro Workman 3000 Series Service Manual page 126

3. Check valve seat for proper contact with valve. If it is
not concentric, recondition valve seat. Check valve mar­
gin. Replace if margin is at limit.
4. Measure free height of spring and replace if it is not
within limit specification.
5. Check valve spring for squareness and replace if limit
is exceeded.
6. Measure clearance between valve guide and valve
stem. If clearance exceeds limit, replace valve guide,
valve or both.
Valve Seat Reconditioning
1. Use a valve seat cutter and pilot or seat grinder to cor­
rect seat width and seat angle.
2. After correction, use lapping compound and lap valve
and valve seat.
Liquid Cooled Gas Engine
Contact with valve seat
(to be at center of valve face)
0.9 – 1.3 mm
(.035 – .051 in.)
�
65
30
Page 3 – 88
Figure 173
2 �
Free length
Figure 174
Stem O.D.
Guide I.D.
Figure 175
0.9 – 1.3 mm
(.035 – .051 in.)
� �
�
45
�
45
Figure 176
Workman 3000/4000 Series
Margin
�
65
�
30