Mazda RX-7 - Checks and Measurements

il
The
first location
is
referred
to
as
the vertical-type, with the oil
cool-
er
mounted
in
front of
the radiator
and attached
to
the
radiator sup-
port
brackets
with
rubber mounts.
The
second
location
is referred to
as
the horizontal-type and
is
su-
perior
to the
vertical-type,
as
it
effectively
lowers the oil tempera-
ture by
approximately
18' F
(10'
c).
(1)
The
installation of the oil cool-
er
in
the
horizontal location
requires
fabrication of mount-
ing brackets as
shown
in
the
illustration.
(2)
lnstall
the brackets by utiliz-
ing the
bumper
bracket
bolts,
as shown
in the illustration.
Brackets
Oilcooler
Note: Alldimenslons
are in mm.
Checks
and
Measurements.
A.
Side
housing.
1. Checks
(to
be done
before
clean-
ing)'
(1)
In
the area
where
the side
housing contacts
and
mates
with lhe
rotor
housing,
check
all
around
the
coolant
Pas-
sages
for signs
of coolant
or
gas
leakage
or surface
abra-
sion.
(2)
On
the
rubbing surface,
check
for
excessive
wear
or scuff
ing
on or
in the
paths
traced bY
the rotor
seals.
2. Cleaning.
Clean
off any
surface
dePosits
with MEK
or
paint
thinner.
lf
the
deposits are
resistant to cleaning
with either of these solvents, use
#400-#600
sandpaper wetted
with
oil.
3. Measurements.
(1)
Surface
flatness
(side
housing
distortion).
a)
To
check surface
flatness
use an accurate straight
edge and a set of
feeler
gauges.
b) Check the surface
in the
four locations shown
in
Figure 1. The limit for dis-
tortion
is
0.04
mm, and
if
this
limit is
exceeded
at
any
point,
the
side
housing
must be
replaced.
Stepped wear
from
side seal.
a)
To check the side
seal wear,
use a dial
indicator with a
sharp
tip and a suitable
dial
indicator stand,
and ch'eck
as shown
in Figure 2.
1.
2.
--
I
p
I
_Y_ _
(2)
I
60
>l
t*
r
l'f
t,
a
i
:
t
n
'I
It
!
b)
The
allowable
limit for wear
is
0.1
mm, and
if this limit
is exceeded,
the
side
hous-
ing must be
replaced.
Bumper
mounting
bracket
holes
Oilcooler
1
o
\
6
2oaq
'u
li
@
o
B
o
&
ooo4
#
o
@
Figure 1
\*r-.X"#
Figure 2
ENGINE
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