Service manual
ENGINE
INSPECTION
CYLINDER
LINER
1.
Wear Inspection. Measure the liner bore at three
positions
of
upper, middle and lower portions with a cylinder
gauge in
X-X
and
Y-
Y directions as shown.
If
wearing
exceeds the limit, replace the liner.
Cylinder
Liner
Bore
71
Bn1
C 88.925 - 88.950
mm
(3.5010 - 3.5020 in)
Wear
Limit 0.20
mm
(0.008 in)
Y
X--I+--
---J+-X
'-'
.....
-/
X - X IS THE THRUST DIRECTION
y
CYLINDER
LINER
2.
Cylinder Liner Replacement. Hydraulic press or
similar device is needed.
a. Attach the cylinder liner puller and installer
to
the lower
rim
of
the cylinder liner, then press out the liner.
b. Check for scratches on the cylinder block side and,
if
any,
remove
them
by using extremely fine emery paper with
engine oil.
c.
To
install the liner, apply engine oil on the cylinder block
bore and the liner exterior, then set the liner on the
cylinder block.
Using the cylinder liner puller and
installer, press the liner into the cylinder block.
NOTE:
Press the liner
in
straight.
When
press
fitting
the
liner,
keep the pressure within a
range
of
1-3
tons
(2,200 - 6,600
[b).
Measure the liner protrusion and correct it
if
necessary.
Protrusion Limits
71 B 0.101 - 0.000
mm
(0.0040 - 0.0000 in)
71 C 0.659 - 0.790
mm
(0.026 -
0.031
in)
PROTRUDING
LENGTH
PISTON
AND
PISTON
RING
1.
Visual Inspection Check the sliding surface and ring
groove
of
the piston for wear, scratches
or
any other damage.
a. Inspecting the clearance between the piston and the
cylinder liner.
b. Check the clearance between the piston and the cylinder
liner by measuring the cylinder bore and the piston
diameter and,
if
the clearance exceeds the limit, replace
the cylinder liner
or
piston.
MEASURING
GAUGE
PISTON
LINER
c.
To
measure the piston
<1lameter,
measure
18
mm
(0.7
in)
above from the piston bottom at right angle to the
piston pin.
Piston
and
Cylinder Clearance
71B
0.044 - 0.70
mm
(0.0017 - 0.0028 in)
71C
0.054 - 0.080
mm
(0.0021 - 0.0031 in)
Standard Piston
Diameter
71 B 88.880 ± 0.013
mm
(3.4989 ± 0.0005
in)
71C
88.872 - 88.898
mm
(3.499 - 3.500 in)
_-;:::;::=::::::;;;-_..--SUB
COMBUSTION
CHAMBER
(71C)
TAKE
MEASURE
UP
.18
mm
(0.7 in)
3.
Piston Ring
Inspection
Check
the piston ring for
breaks, seizure
and
wear
and,
if
any
of
these conditions exist,
replace the ring.
Check
the clearance between the piston ring
and the ring groove and,
if
it exceeds the limit, replace the
ring.
Clearance limit
71Bn1C
0.30
mm
(0.012 in)
Engines & Generators
17