Connecting Rod And Connecting Rod Bearings; Cylinders - Toro Groundsmaster 300 Series Service Manual

Connecting Rod and Connecting Rod Bearings (Fig. 71)
1. Check for bending or distortion of the connecting rod.
If excessive, replace the rod (0.002 inch or 0.05 mm
max.).
2. Assemble each connecting rod to the crankshaft in
their proper order. Use a feeler gauge to measure the
connecting rod thrust clearance between the connect-
ing rod and crankshaft. The proper clearance is .0039
-.0138 inch (.1 -.35 mm). If the clearance exceeds this
amount replace the connecting rod assembly.
3. The connecting rod journal to crank pin oil clearance
can be measured using a micrometer or Plastigauge.
Refer to "Crankshaft Bearings," for tolerances.
Cylinders (Fig. 72)
1. Measure the cylinder bore size in six locations as
shown. The standard bore diameter is 2.8740 inches (73
mm). The cylinder must be rebored and oversized piston
and rings installed if the diameter exceeds the standard
by .0079 inch (.2 mm). Examine the cylinder bore di-
ameter readings to determine the amount of taper of the
cylinder. If the taper exceeds .0004 inch (.01 mm) the
cylinder must be rebored and oversized piston and rings
installed.
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Groundsmaster 300 Series
Measuring connecting rod thrust clearance
Checking cylinder bore size
Page 4 - 57
Figure 71
Figure 72
Cylinder Block Overhaul