Maintenance
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3.2.8. Piston assembly
1) Disassemby of piston assembly
Disassemble piston according to the disassembly process
2) Piston inspection
a) Visual check
Visually check the pistons for cracks, scuff or wear, paying particular attention to the ring groove.
b) Clearance between the piston and cylinder liner
With an outside micrometer,
measure the piston outside
diameter at a point 13mm away
from the lower end of piston skirt
in a direction at a right angle to the
piston pin hole.
Using a cylinder bore gauge,
measure cylinder liner inside
diameter at 3 points (cylinder top
ring contacting face, middle, and
oil ring contacting face on BDC) in
a direction at an angle of 45°.
Take the mean value with the largest
and smallest values excepted.
The clearance is computed by subtracting the piston outside diameter from the cylinder liner
inside diameter.
Replace either piston or cylinder liner, whichever damaged more, if the clearance is beyond
the specified limit.
<Main bearing oil clearance>
ED4OM053
Position of measuring
outside diameter
13mm
Standard
110.903 ~ 110.917 mm
Standard Limit
111
~
111.022
mm
111.122
mm
Standard Limit
0.083
~
0.119
mm 0.3
mm
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