Doosan DX60R Shop Manual page 316

Disassembly of Crankshaft and Piston Components
Remonal of Pistons
Keep the piston pin parts, piston assemblies, and
connecting rod assemblies together to be returned to the
same position during the reassembly process. Label the
parts using an appropriate method.
Engines with high operating hours may have a ridge near
the top of the cylinders that will catch the piston rings and
make it impossible to remove the pistons. Use a suitable
ridge reamer to remove ridges and carbon prior to
removing the pistons.
NOTE: Pistons can fall from cylinder block if the engine is
inverted. Rotate the engine so the connecting rods
are horizontal before removing the connecting rod
caps.
1. Using a feeler gauge, measure the connecting rod side
clearance as shown (Figure 179). See "Connecting Rod
Big End" on page -99 for the standard limit. If the
measurement is out of specification, replace the
crankshaft, connecting rod, or both.
2. Measure bearing oil clearance prior to removing the
pistons and connecting rods to determine extent of wear.
Record the measurements.
Mark the connecting rod caps and connecting rods so
the caps and connecting rods stay together.
A. Remove the bearing cap. Do not remove the bearing
inserts at this time.
B. Wipe oil from the bearing insert and crankshaft
journal surfaces.
Engine
Page 136
CAUTION
IMPORTANT
IMPORTANT
Figure 179
SP001693