Cub-cadet Yanmar 3TNV72 User Manual download pdf (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

20 mm

(0.75 in.)

20 mm

(0.75 in.)

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