Download Doosan D30S-5 Service manual

Inspection of Camshaft
4. Use the color check method or Magnaflux® to
inspect the crankshaft for cracks. Replace the
crankshaft if evidence of fractures are found.
1. Use V-blocks and a dial indicator to check
camshaft bend (Figure 6-121). Place the indicator
on the center bearing journal.
5. Measure the outside diameter of each crankpin
(Figure 6-120, (2)) and main bearing journal
(Figure 6-120, (1)). See Crankshaft on page 70
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.
Figure 6-121
2. Rotate the camshaft and observe the runout. See
Camshaft on page 68 for specifications.
3. Measure the height of each lobe
(Figure 6-122, (1)). See Camshaft on page 68 for
specifications.
Figure 6-120
Figure 6-122
4. Measure the diameter of the gear end (Figure 6123, (1)), intermediate (Figure 6-123, (2)), and
flywheel end (Figure 6-123, (3)) bearing journals.
See Camshaft on page 68 for specifications.
4TNV98 & 4TNE98 Diesel Engine
125
Section 3. Engine