Doosan DP180LBF - Measurement of Crankshaft Bearing and Connecting Rod Bearing

12. Others/driving system
183
DV2213150A
Measurement of Crankshaft Bearing and
Connecting Rod Bearing
1. Visual inspection
Visually inspect the crankshaft bearing and connecting
rod bearing for scratch, unusual wear or damage.
2. Oil clearance between crankshaft and bearing (Method 1:
Dial gauge)
1) Assemble the main bearing to the cylinder block, tighten
the bearing cap to the specified torque.
2) Measure the inner diameter.
DV2213151A
3) Assemble the bearing to the connecting rod, tighten the
bearing cap to the specified torque.
4) Measure the connecting rod bearing journal inner diam-
eter.
DV2213152A
5) if the cleanrance exceeds the tolerance limit, grind the
crankshaft journal and pin, and assemble under size
bearing.
3. Oil cleanrance between crankshaft and bearing.
(Method 2: Plastic gauge)
1) Assemble the crankshaft to the cylinder block.
2) Place the plastic gauge on the crankshaft journal and
pan.
3) Assemble the bearing cap and tighten the bolt to the
specified torque.
4) Loosen the bolt, remove the bearing cap.
5) Measure the width of the plastic gauge at the widest point
using the ruler for plastic gauge measurement. This is the
oil clearance.
6) Measure the oil clearance of connecting rod as the same
procedure.
Item Standard Limit
Warpage of crankshaft 0.06mm 0.4mm
Item Standard
Tightening torque
First 30 kgf·m + 90°
Item Standard
Journal’s inner diameter
Ø104mm
Item Standard
Tightening torque
First 10 kgf·m + 90°
Item Standard
Inner diameter
Ø90.00
Item Standard Limit
Clearance 0.056 ~ 0.118mm 0.143mm
A
8
8
Section
A-B
B
1
2
3
10
10