Cub Cadet Yanmar 3TNV72 - Manual (Page 146)

ENGINE
TNV IDI Service Manual 6-47
Cylinder Block
Figure 6-61
4. Remove the rear oil seal (Figure 6-62, (1)) from
the flywheel housing (Figure 6-62, (2)).
Figure 6-62
5. Apply a continuous bead of ThreeBond Liquid
Gasket No. 1212, Yanmar Part No.
977770-01212 to the outside diameter of a new
oil seal (Figure 6-62, (1)).
6. Install a new seal in the flywheel housing
(Figure 6-62, (2)) with the lip facing in away
from the flywheel. Apply lithium grease to the lip
of the seal.
Crankshaft Bearing Oil Clearance
Oil clearance should be checked during
disassembly to determine the extent of wear, and
during assembly to ensure long engine life. The
same procedure is done for both connecting rods
and main bearings. See Removal of Pistons on
page 6-42 or Removal of Crankshaft on page 6-44
for specific information.
Inspection of Cylinder Block
1. Ensure that oil passages are clear and
unobstructed.
2. Check for discoloration or evidence of cracks. If
a fracture is suspected, use the color check
method or the MAGNAFLUX
® method to
determine if the cylinder block is fractured.
3. Measure cylinders for roundness, taper, and
inspect for evidence of scoring. Consider
honing, re-boring or replacing the cylinder block
if the measurements are not within
specification.
• Take measurements at three places
(Figure 6-63) (a, b, and c), and in two
directions (d and e) in each cylinder. Collect
and record the measurements. See Cylinder
Block on page 6-13 for specifications.
Figure 6-63
Roundness
Roundness can be calculated by subtracting the
smaller measured value from the larger measured
value of (d or e) at each measuring location (a, b,
and c).
Taper
Taper can be calculated by subtracting the
minimum measured value from the maximum
measured value of locations (a, b, and c).
Calculate along both the (d) axis and (e) axis and
use the larger of the two calculations as the value
to compare to the specifications.
0002181A
(2)
(1)
(2)
(1)
0000230B
a
b
c
d
e
20 mm
(0.75 in.)
20 mm
(0.75 in.)
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