which result after long periods of opera-
A cracked or excessively scored liner
tion.
Unless this glaze is removed, the
A slightly scored
must be discarded.
time required to seat new piston rings
liner may be cleaned up and reused.
will be lengthened.
Excessive liner-to-block clearance or
2. Remove the ridge (Figure 11B-133 on
block bore distortion will reduce heat
page 11B-86) formed at the top by the
transfer from the liner to the block and
piston ring travel. Otherwise, interfer-
Poor contact be-
to the engine coolant.
ence with the travel of the new compres-
tween the liner and the block bore may
sion rings may result in ring breakage.
be indicated by stains or low pressure
areas on the outer surface of the liner
Therefore, even though the taper and
(see Figure 11B-131 on page 11B-84).
out-of-round are within specified limits,
the glaze and ridge must be removed by
Examine the outside diameter of the liner
working a h o n e u p a n d d o w n t h e f u l l
for fretting.
Fretting is the result of a
length of the liner a few times.
slight movement of the liner in the block
bore during engine operation, which
Place the liner in a fixture (a scrap cyl-
cause material from the block to adhere
to the liner.
inder block makes an excellent honing
These metal particles may
be removed from the surface of the liner
f i x t u r e ) . H o w e v e r , if it is necessary to
with a coarse, flat stone.
hone a liner in the cylinder block that is
to be used in building up the engine, the
The liner flange must be smooth and flat
engine must be dismantled and then, af-
on both the top and bottom surfaces.
ter honing, the cylinder block and other
Check for cracks at the flange. The lin-
parts must be thoroughly cleaned to en-
sure
er insert must also be smooth and flat on
that
all
abrasive
material
is
the top and bottom surfaces.
removed.
Replace
the insert if there is evidence of brinell-
ing.
The hone J5902-01, equipped with 120
grit stones J 5902-14, should be worked
A used cylinder liner must be honed for
up and down the full length of the liner
the following reasons:
a few times in a criss cross pattern that
p r o d u c e s hone marks at a 45 axis.
NOTE
After the liner has been honed, remove
Do not modify the surface finish in
it from the fixture and clean it thorough-
a new service liner. Since the lin-
l y . Then dry it with compressed air and
er is properly finished at the fac-
check the entire surface for burrs.
t o r y , a n y change will adversely
affect seating of the piston rings.
After honing, the liner must conform to
the
same
limits
on
taper
and
out-of-round as a new liner and the pis-
1. B r e a k t h e g l a z e ( F i g u r e 1 1 B - 1 3 2 ) d u e
ton-to-liner clearance must be within the
t o the rubbing action of the piston rings
specified limits.
L i n e r Measurement
Measure the block bore and the outside
diameter
of
the
liner.
If
the
liner-to-block
clearance
(with
used
parts) exceeds 0.0025" or 0.001" press
fit, it will be necessary to bore the block
for an oversize liner.
Install the liner in the proper bore of the
c y l i n d e r b l o c k . M e a s u r e the inside diam-
eter of the liner at the various points
in
shown
page
11B-86.
Use cylinder bore gauge J
5347-01, which has a dial indicator cali-
brated in 0.0001" increments. Set the
Figure 11B-132. Glaze Surface of
cylinder bore gauge on zero in master
Cylinder Liner
11B-85
E n g i n e (Less Major Assemblies)
