POWR
5-41
6D45F11
Power unit
Checking the piston pin boss bore
1.
Measure the piston pin boss bore.
Replace the piston if out of specification.
Checking the piston pin
1.
Measure the piston pin diameter.
Replace if out of specification.
Checking the connecting rod small
end inside diameter
1.
Measure the connecting rod small end
inside diameter
a
. Replace the connect-
ing rod if out of specification.
Checking the connecting rod big
end side clearance
1.
Measure the connecting rod big end side
clearance
a
. Replace the connecting rod
or crankshaft, or both if out of specifica-
tion.
6D451240
a
6D451270
6D451265
a
6D451250
Piston ring side clearance:
Top ring
a
:
0.04–0.08 mm
(0.0016–0.0032 in)
Second ring
b
:
0.02–0.04 mm
(0.0008–0.0016 in)
Oil ring
c
:
0–0.22 mm
(0–0.0087 in)
Piston pin boss bore:
14.004–14.015 mm
(0.5513–0.5518 in)
Connecting rod big end side
clearance
a
:
0.050–0.220 mm
(0.0020–0.0087 in)
Connecting rod small end inside
diameter
a
:
14.015–14.029 mm
(0.5518–0.5523 in)
Piston pin diameter:
13.996–14.000 mm
(0.5510–0.5512 in)
6D45F11-05 03.10.9 20:44 Page 44
