Toro Workman 3000 Series Service Manual page 136

8. Visually check surface of connecting rod bearing. Re­
place bearing if uneven, streaked, damaged or seized.
When streaks or seizure are excessive, check the
crankshaft. If crankshaft is damaged, replace crank­
shaft or machine to next undersize.
9. Measure inner diameter of connecting rod bearing
and outer diameter of crankshaft pin. If the gap (oil clear ­
ance) exceeds the limit, replace the bearing and/or
crankshaft or machine crankshaft to next undersize.
Use bearings to match undersize crankshaft.
Standard value 0.022 – 0.052 mm (.0009 – .0020 in.)
Limit .01 mm (.004 in.)
NOTE: (see Crankshaft and Flywheel for measuring oil
clearance with plastic gauge method).
Piston and Connecting Rod Reassembly
1. Install connecting rod to piston with "front" identifica­
tion marks both facing the same direction (arrow mark
on piston and die mark on "convex portion" of connect­
ing rod). Apply engine oil to piston pin and use piston pin
setting tool to install piston pin from "front" side of piston.
Piston pin setting force
2. Assemble oil ring spacer into piston ring groove.
Install upper side rail first, then lower side rail. NOTE:
There is no difference between upper and lower side
rails or spacers. The following identification colors are
painted on new spacers and side rails according to size.
Size
Standard
0.25 mm (.0098 in.) O.S.
.050 mm (.1097 in.) O.S.
.075 mm (.0295 in.) O.S.
1.00 mm (.0393 in.) O.S.
IMPORTANT: To install, push side rail in with your
finger as shown after fitting one end over the piston
groove. DO NOT use a ring expander. Use of a ring
expander can break the side rail. Make sure side
rails move smoothly in either direction.
Liquid Cooled Gas Engine
5,000 – 15,000 N
(1,102 – 3,307 lbs.)
Identification color
None
Two blue lines
One red line
Two red lines
One yellow line
Page 3 – 98
Push rod
Guide A
Figure 205
Front mark
Front mark
Figure 206
Figure 207
End of side rail
Figure 208
Workman 3000/4000 Series
Piston pin
Piston pin
Side rail
Spacer