Toro Groundsmaster 328-D, Service Manual

Page: 86 / 402

Crankshaft Bearings (Fig. 68, 69)
1. Measure the crankshaft for “run-out” (bend). Mount
the crankshaft in a pair of V-blocks (or live centers) and
use a dial indicator to measure the run-out in the crank-
shaft. The maximum allowable crankshaft run-out is
.0012 inch (0.03 mm).
2. Check the crank journals and crank pins for damage
such as galling, seizure, etc. If journals or pins are
seriously damaged they may be reground and over-
sized bearings installed. The main bearing and connect-
ing rod bearing oil clearances may be measured with a
micrometer or Plastigauge. Crankshaft oil clearances
are: Journal, 0.0039 inch (0.10 mm); Crank pin, 0.0059
inch (0.15 mm).
NOTE: When using Plastigauge to measure the clear-
ance between the crankshaft and its bearings, install the
crankshaft into the cylinder block, place a piece of
Plastigauge onto the crank pin or journal, and torque the
bearing cap (with bearing) in place.
DO NOT TURN THE
CRANKSHAFT WHEN PLASTIGAUGE IS IN PLACE SINCE
THE PLASTIGAUGE WOULD BE DESTROYED
. Remove
the bearing cap and measure the width of the Plasti-
gauge to determine the clearance. If the oil clearances
exceed these amounts attempt to install a new bearing
to reduce the clearance. If installing a replacement
bearing does not reduce the clearance to within toler-
ance the crankshaft must be reground and an oversized
bearing installed.
Timing Gears (Fig. 70)
1. Inspect the idler gear, fuel injection pump gear, cam-
shaft gear and crankshaft gear for wear or damage.
Replace these gears if defective.
Figure 68
Figure 69
Figure 70
Cylinder Block Overhaul Page 4 - 56 Groundsmaster
®
300 Series