Mazda RX-7 1989 Service manual

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•
RX-7
CONTENTS
TITLE
ENGINE
LUBLICATION SYSTEM
COOLING SYSTEM
-
FUEL AND EMISSION
CONTROL SYSTEMS
(NON- TURBO)
----- --- --- --- ---- ---
FUEL AND EMISSION
CONTROL SYSTEMS (TURBO)
- -- -
ENGINE ELECTRICAL SYSTEM
MANUAL TRANSMISSION
-- -- --
AUTOMATIC TRANSMISSION
(ELECTRONICALLY-CONTROLLED)
-- --- ---- - --
FRONT AND REAR AXLES
STEERING SYSTEM
BRAKING SYSTEM
-- -- -----
SUSPENSION
SECTION
1
2
3
4
5
7
9
10
11
13
BODY 14
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BODY ELECTRICAL SYSTEM 15

c
-ENGINE
OUTLINE .................................................. C- 2
OUTLINE OF CONSTRUCTION ................. C- 2
STRUCTURAL VIEW ................................ C- 2
SPECIFICATIONS .................................... C- 4
INTERCHANGEABILITY ............................ C- 5
TENSION BOLT ........................................ C- 6
FRONT COVER ......................................... C- 7
ROTOR .................................................... C- 8
97UOCX 501
e
e

OUTLINE
OUTLINE OF CONSTRUCTION
The 13B in the 1989 RX-7 is basically the same as in the previous model but with some modli c:=:- _
improved engine performance.
Major changes
1. Rotor : Lighter, rotor recess shape change to increase compression ratio
2. Tension bolt : Strengthening ribs added
3. Front cover : Shape changed for new metering oil pump
4. Side housings : Inlet port erea enlarged
STRUCTURAL VIEW
HOUSING-RELATED PARTS
FRONT ROTOR HOUSING
FRONT HOUSING
FRONT OIL SEAL
REAR HOUSING
REAR ROTOR HOUSING
INTERMEDIATE
HOUSING
C-2
97UOCX·502
._)
·-

~ TING-RELATED
;:;'"'TA PARTS
BALANCE WEIGHT
ECCENTRIC PULLEY
REAR ROTOR
FRONT ROTOR
' •
DRIVE PLATE
COUNTER WEIGHT
FLYWHEEL
-.
C-3

SPECIFICATIONS
Item Model Turbo Non-Turbo
Eng1ne type Rotary eng1ne
~~
Displacement
cc (cu 1n)
6S4 X 2 (40.0 X 2)
Number of cyl1nders and arrangement
2 rotors. longitudinal
Combustion chamber type
Bathtub
Compression
rat10
9.0 1 9.7 1
A1r Induction 4 port
1nduct1on
6 port 1nduct1on
Pnmary 4S0 ATOC
32° ATOC
Open
Secondary
32° ATOC
Auxiliary 4S0 ATOC
Intake Pnmary
S0° ABOC
40° ABOC
Port t1m1ng
Close Secondary
soo ABOC 30° ABOC
Auxil1ary
80" ABOC \
Open
7S0 BBDC
Exhaust Close
48° ATOC
Fuel supply system EGI
lgn1t1on t1ming (w1th test connector
Tra1l1ng
(Green 1-p1n) grounded)
Lead1ng
20°
± 2 ' ATOC (REO)
l,~
so ± 1o ATOC (YELLOW)
Idle speed (w1th test connector (Green 1-pln)
grounded) rpm 750 ± 25
97UOCX 504
C-4

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INTERCHANGEABILITY
::: ,.,,ng chart shows interchangeability of major components of the previous model and the 1989 mode'
... ousmg-
·~ ated
;:.a r1S
X Not interchangeable
Part
Front rotor hous1ng
Rear rotor hous1ng
Front hous1ng
intermed1ate housing
Rear housing
nner
seal1ng rubber
Outer sealing rubber
Front cover
Orl pan
Tens1on bolt
i
. - ---1
I
+
;; :~at1ng- ::ccentnc shaft
-~ a~ed
=~~s Rotor
~~pex seal
J
3a',ance weight I
J I pump dnve sprocket -~· .
: :centr1c shaft pulley t
'C =centnc shaft bypass valve - -
Sde seal
:::orner seal
-1
~ . ·ey lock bolt
~ . :. heel (MIT)
l
I,
•· beanng (MIT)
.1ter we1ght (A/T)
Interchangeability
X
X
0
X
0
X
0
X
0
0
0
X
0
X
0
0
X
0
X
C-5
Remark
• Knock sensor boss added
• Inlet port area enlarged
• Shape changed to Incorporate new metw
tng Oil pump
• Ribs added to center of shank
• We1ght reduct1on
• Combustion chamber shape changed
• Shape changed
• Shape changed
• Shape changed
• We1ght reduct1on
• Shape changed
' •
We1ght reduct1on

TENSION BOLT
OTHERS
(}1
No.18 BOLT
NOTE
No.1? SOL
T IS LONGER THAN
OTHERS. THERE IS AN IDEN-
TIFICATION MARK.
T
lllllllllllllllllllllllllllllll
STRENGTHNING RIBS
128 ± 2mm (5.04 ± 0.08 in)
HEAT-SHRINK PROTECTOR
No.18 BOLT
97UOCI 506
The strength of the tension bolts 1s increased by addit1on of strengthening ribs in the middle of the shank.
The tension bolt installed into the No.18 hole differs from others
in that it is not fully enclosed. lead1ng to
transmiss1on of eng1ne noise. To reduce this noise. the heat-shrik protector is used on the bolt where 1t goes
through the intermediate housing boss. The No.18 bolt
is supplied as an assembly (bolt w1th washer and
protector).
If the bolt is reused and the protector is damaged, replace the protector. The protector 1s easily
shrunk w1th a l1ghter or match.
C-6
...

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FRONT COVER
FRONT COVER GASKET
FRONT COVER
~BACKUP RING
0-RING
~ · 989 RX-7 front cover is changed to incorporate a new metering oil pump.
:::::ded between the front cover and front housing for improved sealing.
C-7
97UOCX 507

ROTOR
TURBO
~
~
\
RIBS A
A~
/J
10.9mm (0.43 in)
I
NON-TURBO
c--~~
v
~
RIBS A A
~-
r---/1
8.8mm (0.35 in)
97UOCX 508
The rotor in the 1989 RX-7 is lighter and provides a higher compression ratio (9.0 : 1 for turbo model and
9.7 : 1 for non-turbo model) than the previous engine.
These improvements results
in a engine with more power and torque.
The rotor ribs are redesigned for increased strength.
The combustion chamber rotor recess
1s made more uniform by utilizing a mechanical cutting process.
The rotor for turbo and non-turbo engines are distinguished by the rotor recess shape.
C-8
,_ 4