Valve Springs; Rocker Arm And Rocker Shaft - Toro Workman 3000 Series Service Manual

Valve Springs

1. Check the valve springs for rust, pitting, cracks or
other damage.
2. Check the squareness of the valve spring by putting
it upright on a level surface. Any spring that is 3
out of square must be replaced.
3. Measure the spring free length. Any spring that has
a free length of 39.3 mm (1.55 in.) or less must be
replaced.
4. Over a period of time, valve springs can lose some of
their tension. The spring must be replaced if the tension
is less than the service limit. (Fig. 68)
Minimum Installed Load/Height
(IN) 5.05 kg / 35.5 mm (11 lb. / 1.4 in.)
(EX) 12.61 kg / 28 mm (27 lb. / 1.1 in.)

Rocker Arm and Rocker Shaft

1. Remove the snap ring on each end of the rocker shaft.
Remove the rocker arm stay bolts. Remove rocker arm
stays, spring and rocker arms from the shaft (Fig. 69).
2. Inspect each rocker arm for wear at the valve tip and
push rod contact surfaces. Replace any worn or dam­
aged rocker arms.
3. Inspect the rocker shaft for wear or damage. Replace
the rocker shaft if it is worn or damaged.
4. Measure the rocker arm inside diameter and the shaft
outside diameter. Replace the shaft if the rocker arm to
shaft clearance is more than 0.02 mm (0.008 in.).
5. Make sure the oil passages in the rocker shaft and
rocker arms are open. Clean if necessary.
IMPORTANT: When assembling the rocker assem­
bly, make sure the identification mark (small drilled
hole near the end of the shaft) is at the front and
facing the valve side.
Workman 3300-D/4300-D
o
or more
1. Oil filler cap 6. Rocker spring
2. Breather hose
3. Rocker cover
4. Rocker cover gasket
5. Rocker shaft
Page 4 - 63
Figure 68
Figure 69
7. Adjusting screw
8. Rocker arm
9. Rocker stay
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