Mazda RX-7 - Differential Checks, Adjustments and Practices

CHASSIS/DRIVELINE
(4)
To
check
the
rear
universal
ioint,
attach
the
sliding
scale
io
the
f
lange
bolt
hole.
To
check
ihe
center
universal
ioint,
hang
the
driveshaft
ver'
iicariv
tro-m
tne
forward
end
anO
ittacn
the
sliding
scale
with
a
wire
around
the
drive-
shaft,
100
mm
from
the
center
of
tni
joint,
as
shown
in
the
illustration.
D.
Differentlal.
1.
Break'in.
A
new
dif
ferential
must
be
broken
in
before
using
in
comPetition'
This
can
be
done
in
a
standard
Passenger
car,
and
the
Procedure
is as
follows:
OPerate
at
or
For
this
-
below
this
number
of
speed:
kilometers:
60
km/h
(40 mi/h)
100
km
(gg
til
B0
km/h
(so
mffir)
100
km
(gqlni).
roo
lmrn
ioo
min)
2oo
km
t]fQ
m!)
'
Total:
4@
km
(240 mi)
Due
to
the
initial
Preload
on
the
oinion
gear,
lack
of
a
Proper
'break-in-will
result
in
an
exces'
iiuefy
high
oil
temPerature
and
scoring
of
the
gear teeth'
2.
Lubricant.
The
Proper
lubricant
is 90
wt
hYPoid
gear
oil'
The
amount
re'
qlireO
f6r
sufficient
lubrication
is
2.0
liters'
When
the
ambient
tem'
Perature
is
above
85
'
F'
us.e
a
hign"t
viscosity
lubricalion^than
th6
normallY-recommended
90
wt'
3.
Preload.
(1)
With
a
new
Pinion
bearing
the
Preload
should
b
e
9'14
Kg'cm'
After
break'in,
the
Proper
Pre-
load
is
2.3-3.5
kg-cm'
(2)
lf
using
a
used
bearing'
the
' '
Preload
should
be
the
same
as
it
was
before
disassembling
the
differential-
lf
it
is
not
Pos'
sible
to
achieve
that,
rePlace
the
distance
Piece'
4.
When
exchanging
the
ring
ancl.
oinion,
use
Loctite
on
the
bacK
oI
lne
rin'g
gear and
bolts'
The
tight'
ening
t-orque
is
6.5'7'5
kg'm'
5.
Breather.
According
to
the
layout
of
the.par'
ticular
race
course,
there
are
three
oositions
for
the
rear
axle
breath'
br.
"t
shown
in
the
illustration'
For
examPle:
(1)
On
a
course
with
Predominanl-
lY
lelt
hand
turns,
use
Posl-
tlons
1 andZand
block
off
3'
(2)
On
a
course
with
Predominant'
lv rioht
hand
turns,
use
Posl'
tioni
Z
and
3
and
block
off
1'
-2.0
0.8
kg
<-lFront