Cub-cadet Yanmar 3TNV72 User Manual download pdf (Page 150)

ENGINE

TNV IDI Service Manual

6-51

Cylinder Block

Inspection of Crankshaft

1. Put the crankshaft end journals

(Figure 6-74, (4)) on V-blocks.

2. Place a dial indicator (Figure 6-74, (3)) on a

center main bearing surface.

Figure 6-74

3. Rotate the crankshaft and observe runout.

Record the measurements. See Crankshaft on

page 6-8 for specifications.

4. Use the color check method or MAGNAFLUX to

inspect the crankshaft for cracks. Replace the

crankshaft if evidence of fractures is found.

5. Measure the outside diameter of each crankpin

(Figure 6-75, (2)) and main bearing journal

(Figure 6-75, (1)). See Crankshaft on page 6-8

for specifications. Take measurements at

several places around each bearing surface. If

not within specification, grind the journals and

install undersize bearings, or replace the

crankshaft. Record the measurements.

Figure 6-75

Reconditioning the Crankshaft

If any of the crankshaft journals do not meet the

specifications, it may be possible to grind any or all

of them to an undersize. The connecting rod

bearings, main bearings, and thrust bearing inserts

are available as 0.010 in. (0.25 mm) undersize. If

the journals are ground undersize, the following

finishing standards (Figure 6-76) must be adhered

to:

0000232A

(2)

(3)

(4)(4)

(1)

0001733A

(1)

(2)

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