Doosan DX60R Shop Manual page 328

NOTE:
When honing a cylinder, with either a ridged
hone or a ball hone (1, Figure 209), move the
rotating hone up and down in the cylinder bore
to accomplish a 30° to 40° crosshatch pattern
(Figure 209). This will provide the ideal surface
for the proper seating of new piston rings.
Do not allow the honing tool to operate in one position for
any length of time. Damage to the cylinder wall will occur.
Keep the tool in constant up-and-down motion.
• Use a 50:50 mixture of diesel fuel and engine oil as a
honing fluid.
• Use a 300-grit hone at 300-1200 rpm (Figure 208).
Solvents woll not not adequately remove honing
resudue, resulting in premature piston and ring
wear. Always wash cylinders using hot, spapy
water.
• When honing is completed, wash the cylinder block
with hot water and soap. The cylinder wall is
adequately cleaned when a white rag wiped in
cylinder comes out clean. Use brushes to clean all
passages and crevices. Rinse withhot water and dry
with compressed air. Apply clean engine oil to all
steel surfaces to prevent rusting.
Reassembly of Crankshaft and Piston Components
NOTE:
Proceed slowly. Make no forced assemblies unless a
pressing operation is called for. All parts must be
perfectly clean
assembled.
Use new gaskets, seals and O-rings during assembly.
Liberally apply clean engine oil to all internal parts
during assembly.
All fasteners should be tightened to a given torque. If
a special torque is not provided in the Special Torque
Chart on page 6-23, tighten to standard torque
specifications. See "Tightening Torques for Standard
Bolts and Nuts" on page -48
Engine
Page 148
CAUTION
IMPORTANT
and lightly lubricated
Figure 209
when
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