Inspection - Toro TC 1000 Service Manual

Engine Inspection
Inspect all parts for wear and damage. Do not
reuse parts that are damaged or worn beyond
specification.
1. Crankshaft Axial Play
maximum allowable axial play:
0.55 mm (0.020")
Axial play can only be measured when the
crankshaft and crankcase are assembled. If
the axial play was not measured during
disassembly, reassemble the crankshaft and
crankcase with the bearings making certain
to properly torque the crankcase screws to
0.4 to 0.5 kg m (35 to 43 in Ibs). See Fig. 95.
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Figure 95
2. Crankshaft Run-out
maximum allowable run-out:
0.05 mm
(.002")
With the crankshaft removed from the crank-
case, support the crankshaft on V-blocks.
The V-blocks should be positioned no closer
than 4 mm (3/16") from the counter weights.
Figure 96
Use a dial indicator and measure run-out at
the positions specified in Fig. 96.
If any measurement is greater than the maxi-
mum allowable limit, the crankshaft should
be replaced. Off-size crankshaft bearings are
not available.
3. Piston Ring End Gap.
Insert a piston ring into the cylinder skirt,
making certain the ring is not tilted. Use a
piston to push in the ring and ensure the ring
is perpendicular in the cylinder bore. Use a
feeler gauge to measure the piston ring gap
between the ends of the piston ring. If the
measured clearance is greater than the .7
mm
(0.027"),
the piston rings may require
replacement. See Fig. 97
I
END GAP
Figure 97
NOTE: Before replacing the piston rings,
make certain that the piston to cylinder
clearance is within specification.
4. Cylinder Bore
5.
Use a bore gauge to measure the cylinder
bore. By itself, this measurement does not
indicate much, however it is important in
determining the piston to cylinder clearance.
The cylinder can be used until the chrome
plating on the bore is worn away ("Ex-
foliates'').
Piston Diameter
Use a micrometer to measure the diameter of
the piston in several places, recording the
largest. As with the cylinder bore measure-
ment, this measurement is important only in
determining the piston tocylinderclearance.
6. Piston to Cylinder Bore Clearance
37