DE08TS Diesel Engines Maintenance
b. Wear measuring
• With an outside micrometer measure the diameter
of the crankshaft journals and pins in the directions
as shown, and compare the measured values to
determine the amount of wear.
• If the amount of wear is beyond the limit, have the
crankshaft ground and install undersize bearings.
However, if the amount of wear is within the limit,
you can correct the wear using an oil stone or oiled
grinding paper of fine grain size. (Be sure to use
grinding paper which has been immersed in oil.)
• In case that pin’s wear is more than the limit value,
grind the crankshaft journal and crank pin, and use
the undersized bearings.
Be sure to use grinding paper which has been
immersed in oil.
<Undersize bearings available>
• Standard
• 0.25 (Inside diameter is 0.25 mm lesser than the
standard size.)
• 0.50 (Inside diameter is 0.50 mm lesser than the
standard size.)
• 0.75 (Inside diameter is 0.75 mm lesser than the
standard size.)
• 1.00 (Inside diameter is 1.00 mm lesser than the
standard size.)
Undersize bearings are available in 4 different sizes
as indicated above, and the crankshaft can be reused
through the regrinding as described above.
* “R” part’s specified value
Crank Pin’s “R” : 4.5
-0.2
Crank journal “R” : 4
-0.2
In case of regrinding, the grinding the “R” part of
bearing end should be correctly done and keep in
mind to remove any jaws or coarse surface
absolutely.
WARNING
2
1
WARNING
" R "
" R "
" R "
" R " " R "
EFM2048I
Normal Poor Poor
B B
B
A
A
B
EFM2047I
44
Standard Limit
Journal diameter N83.966 ~ N83.988 N83.000 mm
Pin diameter N70.971 ~ N70.990 N70.000 mm
0
0
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