Mazda RX-7 - Operating Procedures

ENGINE
Vll.
Operating
Procedures.
Due to
the
high
noise
of the
rotary
engine,
we recommend
using
a
muffler
around
the
garage
or
Pit
area.
An air cleaner
is an
absolute
neces'
sity
at all
times
to
avoid
loss
of
compression
from
dirt
entering
the
engine.
C. Starting
and
warming
up the
engine.
Before
starting
the
engine,
alwaYs
check
the
engine
oil and
coolanl
and
the
V-belt
tension.
And
look
for
any
loose
parts
or
fasteners.
1.
Starting
procedure.
Depress
the
throttle
Pedal
a
cou-
ple
of
times
to squirt
some
fuel
into the
intake,
then crank
the en-
gine
while
holding
the
throttle
about
two-thirds
down.
Note:
On
cold
daYs,
circulate
the
engine
oil
for a short
time before
starting.
2. Warm-up
procedure.
(1)
First
remove
the
radiator
caP,
then start
the
engine.
lmmedi-
ately
after starting,
check
the
oil
pressure
and
release all air
bubbles
bY both
squeezing
the
water
hose bY
hand and
racing
the
engine a
couPle
of
times,
then re-tighten
the
cap secure-
ly.
The
engine should
be warmed
at an
idle
speed
of 2000-2500
RPM,
pntil
the oil
temPerature
reaches
70'C
or 160"
F.
During
warm-up,
watch
f
t,r
coolant
and oil
leaks, and
be
careful
not
to foul a
spark
plug.
D.
Driving
practices.
1.
The
maximum allowable
engine
speed
is
9000
RPM.
2.
Temperature
and
pressure reconl'
mendations
are
as
follows:
When
the oil or
coolant
tempera'
tures exceed
the
limits,
watch
carefully
and check
the sYstem
to
determine
the cause.
lf
the oil
pressure
falls
below
the
lower
limit, stop
the engine
immediate'
ly and
determine
the
cause before
proceeding.
Engine treatment
after
being
run.
1. Pour a
small
amount
of
engine
oil
through
the
carburetor
to
Prevent
internal
rust.
2.
During
the
winter,
drain
the
cool'
ant completely.
Overhaul
schedule.
Starting
with a
fresh
engine,
the
over'
haul schedules
are
based
on engine
rev limits used
during
racing, as
fol'
lows:
G.
Compression
check
Procedure.
Use
the
rotary
engine
cgmpression
tester,
part
number
49 0820
280K.
A
normal compression
tester
will
not
give
a
reading
on
the
condition
of
each
individual
working
chamber.
1. Prior
to measurement:
(1)
Warm
uP
the
engine.
(2)
Remove
the
trailing
spark
plug.
(3)
Screw
the comPression
tester
fitting
into the sPark
Plug
hole.
(4)
Disconnect
the
ignition
at
the
ignitor.
2.
Measurement
Procedure.
(1)
The
comPression
tester
oPer-
ates
on 12
volts.
(2)
To
prclperly
warm uP
the
trac'
ing
needle
the
comPression
tester
must be
turned on
five
(5)
seconds
Prior
to oPeration.
(3)
Crank
the
engine
with
the
throttle
wide
oPen
for 10
sec'
onos.
(4)
Turn
off the
Power
to the
com'
pression
tester.
(5)
Record
the
comPression
read'
i ngs.
A.
B.
E.
F.
(2\
(3)
With a
rev limit of:
Rebuild
after:
9OOO
RPM
2000-3000
km.
(1300-1900
mi.)
85OO
RPM
4000
km.
(2500
mi.)
Normal
Limit
Coolant
temperature
(outlet
side)
70-90' c
(160-195'F)
95'
C
(205'
F)
Oiltemperature
(oil
pan)
90-1
10
"
C
(195-230"
F)
120' c
(250
"
F)
Oil
pressure
(f
ilter
inlet)
5.5-7.5
kg/cm'
0
kg/cm'
24