Doosan DP158LDF - Measurement of Crankshaft Bearing and Connecting Rod Bearing

12. Others/driving system
197
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
t
he bearing cap to the specified torque.
4) Measure the connecting rod bearing journal inner
diameter.
DV2213152A
5) if the cleanrance exceeds the tolerance limit, grind the
cr
ankshaft journal and pin, and assemble under si
ze
bear
ing.
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 an
d
pan.
3)
Assemble the bearing cap and tighten the bolt to th
e
spec
ified 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 t
he
sam
e procedure.
4. End play
1) Assemble the crankshaft in the cylinder block.
2) Install the dial gauge, and measure the end play of
crankshaft by pushing the crankshaft to axial direction.
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 30 kgf·m + 90°
Item Standard
Inner diameter
Ø90.00
Item Standard Limit
Clearance 0.066~0.132mm 0.166mm
A
8
8
Section
A-B
B
1
2
3
10
10