VI. ENGINE CONSTRUCTION AND MAINTENANCE,
1.
CYLINDER LINERS The
2TR13A, 2T73A
engine employs wet type
cylinder liners made of special cast iron.
Cylinder liners must provide a good fit with pis-
tons and piston rings, provide good heat dissi-
pation, and must also have ample wear resistance
(1)
Visual Inspection
The cylinder liner should be replaced when there
are visible scratches, traces of
rust,
or corrosion.
(2)
Inspecting
by
Testing Equipment
[Unit: in
lrnmll
NOTES:
(I)
Measure the inner diameter of the cylinder liner in the
axial
direction of the crank-
shaft
and in the direction of the piston at the following phces: a) at the upper part of
the liner
[l.I811.in (30
mm) below the rop of the linerj, b)
at
the center of the liner,
and c)
at the lower pan of the liner.
(2)
Whether the roundness of the cylinder liner
is
within the allowable
limits
is deter-
mined by
studying the differences in readings obtained in Item
1.
n
(3)
The cylinder liner projection is necessaty in order to reduce distortion
of
the cyl-
inder liner and also to provide
a
good
fit
with the gasket when the cylinder head is
tightened. Accordingly, check to see that the required projection
is
provided.
T&ng equipment
Cylinder gauge
-
Cylinder gauge
Dial gauge
Standard dimension
2.8740-2.8752
(73+0.030
0)
29527-2.9539
(75+0.030,
0
1.
Replacement limit
0.0066 (0.171
0.0066
(0.17)
Item
Inner diameter of
cylinder liner
I
YM135(D)
YM155(DI
2.
3.
Within
0.0008 (0.021
0.0019-0.0051
10.05-0.131
Roundness
Projection
of
cylinder liner
0.0039 (0.1)
-
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