Yanmar 3TNV88F, Руководство по обслуживанию, Страница: 128 / 266

ENGINE
6-44
3TNV88F Service Manual
Crankshaft and Camshaft Components
■
Inspection of tappets
1. Inspect the tappet contact surfaces for
abnormal wear (Figure 6-72, (1)) . Normal wear
will be even as shown in (Figure 6-72, (2)).
Slight surface defects can be corrected using
an oilstone.
Figure 6-72
2. Measure the outside diameter of the tappet
stem (Figure 6-73, (1)) . See Tappet on
page 6-9 for the service limit.
Figure 6-73
3. Measure the tappet bores in the cylinder block.
See Tappet on page 6-9 for the service limit.
■
Inspection of crankshaft
1. Place 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. See
Crankshaft on page 6-7 for specifications.
4. Use the color check method or Magnaflux
®
to
inspect the crankshaft for cracks. Replace the
crankshaft if evidence of fractures are 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 6-7
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.
K0001725
1
2
1
K0001726A
K0000232A
2
3
4 4
1
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