top.
A rubber
joint
provides
tightness
between the
liner
and
the
cylinder
block.
The installed
liners must
protrude
above the top
surface of the cylinder block
by.015 to
.075mm. If
the
measurement
is less than this the
rubber
seals at the base of
the
liners
must be
reneured.
The liners are
identified at the
factory by
one,
two,
three or
four notches on the
lower rim. These
indicate
the
liner
diameter
range
and correspond
to the
Íour sizes
oÍ
piston
also
available. When
installing liners ensure
that these
grading
marks
are fitted to
face
the camshaÍt
side of the
engine.
The
cylinder
liners and the
grading
marks referred to above
can be seen
in
FIG
1 :20 and the
Íour sets of dimensions
are
given
in the table
following:
Liner ref. mark
1
11
111
1111
Liner bore
mm
84.000
to 84.01
1
84.012
to 84.022
84.023
to 84.033
84.034 to
84.044
FIG 1:20
The
cylinder
liner
from the caps.
Then
completely
remove the bolts and
detach
the
big-end
caps. Push the
prstons
out of
the
cylinder bores
and withdraw the assemblies.
lt may
be necessary to careÍully scrape the carbon
formation
away
from
the top of the cylinder
bore to facilitate
removal. Ensure that the connecting
rod bearing
shells and caps are
kept in theiÍ corÍect sets after
removal.
1 :1 1 Pistons,
rings
and
gudgeon
pins
and cylinder
liners
The
cylinder
liners are detachable
wet
type
liners made
oÍ centrifugal cast
iron. They
are
positioned
in the engine
by
a boÍe in the cylinder block at the bottom and
by a
shoulder in the cylinder head
gasket
joint
face at the
Pistons:
The low expansion
aluminium alloy
pistons
have an
elliptical skirt with
wide carving at
the bottom.
The
piston
skirts are
not
split.
DiÍÍerent
pistons
are used on
the later
XC5 engines
which
raise
the
BHP of the engine'from72
to 76. The diÍÍerences
in the measurements
can be seen
in FIG 1 :21
.
Each
piston
is fitted with two compression
and one oil
scraper
ring, the top compression
ring
being chrome
plated.
The reÍerencing oí the
pistons
is made by
means of one
letteÍ, A, B, C or
D which correspond
to the
reÍerence
marks
1,
2,3 or
4
on
the cylinder
liners, and
this is
stamped
on top of
the
pistons.
Also stamped on the top
of the
piston
is the
mark
'AV'
with an arrow.
When fitting
pistons
this arrow
must
point
towards
the
front
oÍ
the
eng
ine.
Earlier
instcllotion
(Also
used
on
3-moin
beoring
engines)
Loter
instollotion
(76
&
9ó hp engines)
404
.
5.04ó.809
404
J
-
4.529.913
404
C
404
L
XC 5 ENGINE
4.497.999
4.85r.595
Compression
rotio
:
7.6/
1
and
later
engines
404
404
J
-
5.04ó.810
-
4.529.914
4.498.001
4.851.59ó
404
C
404 L
P404
A
--(-1-+-
V
Comoression
rotio : 7
.4/
1
FtG 1 :21 Piston
dimensions
for XC5
17
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