1990 MAZDA 232 Workshop Manual Suplement

D OUTLINE
OUTLINE
BUTLINE OF CONSTRUCTION
The
lubrication system of the 323 4WD engine is the same as for the 2WD model.
The Bf DOHC turbocharged engine oil circulation path is different than that of the BP DOtiC non-turbocharged
engine
because of the turbocharger lubrication.
LlJBRICATtON ClRCUlT 93GODX-702
o-2 93GODX.70:

E
COOLING SYSTEM
1NDEX . ..*....*~.....*..*~~**~=~~.~~.~...~..**.~.....*...~.. E- 2
OUTLINE .................................................. E- 4
OUTLlNE OF CONSTRUCTION.. ................ E- 4
COOLANT FLOW CHART.. ....................... E- 4
SPECIFICATKINS
.................................... E- 5
TWO-STAGE THERMOSTAT.. .................... E- 6
RADIATOR AND COOLING FAN.. .............. E- 7
ELECTRIC COOLING FAN SYSTEM ........... E- 8
SUPPLEMENTAL SERVICE INFORMATION E- 9
THERMOSTAT
.......................................... E- 9
INSPECTION
.......................................... E- 9
ELECTRIC COOLING FAN SYSTEM ............ E-l 0
SYSTEM INSPECTlON
.............................. E-l 0
FAN MOTOR
............................................. E-If
iNSPECTION .......................................... E-l 1
WATER THERMOSWITCH
.......................... E-l I
INSPECTION .......................................... E-f 1
RADIATOR THERMOSWITCH
..................... E-l 2
REMOVAL I INSPECTION I INSTALLATION.. E-12
FAN RELAY .............................................. E-l 3
REMOVAL I tNSPECTlUN .......................... E-l 3
93GOEX-701

E tNDEX
INDEX
-
- &ANT RESERVOlR
ENGiNE COOLANT
TOTAL CAPACITY
MTX: 5.0 liters (5.3 US qt, 4.4 Imp qt)
ATX: 6.0 liters (6.3 US qt. 5.3
tmp qt)
1. Fan motor
Inspection .._.....,._............._..........
page E-1 I
E-Z

INDEX E
BP DOHC TURBO
III 6 No.2 AND No.3 RELAY
1. Thermostat 4. Water thermoswitch
Inspection ...................................
page E- 9 inspection ...................................
page E-l 1
2. Electric cooling fan system 5. Radiator thermoswitch
System
inspection .......................
page E-l 0 Removal I Inspection I
3. Fan motor Instailation .................................
page E-1 2
Inspection ...................................
page E-l 1 6 Fan relay
Removal I Inspection .................. page E-1 3
E-3

E OUTLINE
OUTLINE
OUTttNE OF CONSTRUCTION
The cooling system in the 323 4WD model is basically the same as in the 323 2WD model.
Although there is no fundamental change from the BP DOHC of the 2WD model, the coolant circulation
path has been changed to direct coolant to the water-cooied turbocharger.
A two-stage thermostat is used in the BP DUHC turbocharged engine to stabilize the engine coolant tem-
peratu re.
The radiator and cooling fan specifications are different. The BP DOHC turbocharged engine of the 4WD
model uses a two-speed electric cooling fan.
93GOEX-704
COOLANT FLOW CHART (BP DOHC TURBO)
E-4

SPECIFICATlONS
-
km
Cootlng system
Coolant camacltv
EnginelTtansaxte
lrters [US Qt. Imo at)
8P SOHC ] 8P DOW Turbo
MTX ATX
I MTX
Water-cooled, forced crrculation
5.0 (5.3, 4.4)
I 6.0 t&3,5.3) -
1 Type
Water puma 1
I Water seal Centrifugal
Unified mechanical
seal
: Type I Wax,single stage”‘, Wax, two-stage*’ 1 Wax, two-stage
80.5-83.5 (177-182)“1
Opening temperature
“C (OF)
Main: 86.5-89.5 (188-l 93) *’ Main: 86.5-89.5 (lSS--193)
The:mosta! 1 Sub : 83.5-86.5 (182-188) Sub 83.G86.5 (182-188)
1 Full-open temperature OC
(OF) 95 (203)*‘, 100 (212)*’ i 100 (212)
L I
“...Except cold area, *2...Cotd area only
1 r 1 93GOEX-706 j Full-open lift mm (in) 8.5 (0.335) or more’l
Main: 8.0 (0.31).mln.‘2
Sub : 1.5 10.061 min * Main: 8.0 (0.31) min.
Sub : I.5 (0.06) mm.
Radiator 1 Type
Cap vaive opening-pressure ’
kPa (kglcm2, psi) Corrugated fin
74-l 03 (0.75-I .05, 11-l 5) j Tvm?
EIectnc I
Coohg fan f Outer drameter mm (in) 320 (12.6) 340 (13.4)
Blade
Number 4 5
Motor
/ Current A
6.6 * 1 Hi : 13.3 + 10% max.
Lo: 8.8 + 10% max. E-5

E OUTlANE
TWO-STAGE THERMOSTAT (BP DOHC TURBO)
MAIN VALVE
SINGLE-STAGE THERMOSTAT
(AMBIENT fEMP. -20% (4*f))
NTRANCE PORT TEMP
GINE EXIT PORT TEMP.
- 100 km/h
60 kndh
(63 mph) ~~~~~ (38 mph)
TWO-STAGE THERMOSTAT
A sub-valve is incorporated in the thermostat to stabilize the coolant temperature in the engine, to improve
cold weather performance, and to reduce heater output temperature fluctuations as noted in the diagram.
Operation
Stage 1
During cold weather operation, 83.5*C [182°F]-86.50C [t 88OF] only the sub-valve opens to control the
engine coolant temperature.
Stage 2
During normal operation, 86.5OC (1 88°F)-89.50C (I 93OF) the main valve opens to permit increased coul-
an: flow through the radiator.
E-6

RADIATOR AND COOLING FAN
The radiator and cooling fan specifications are revised.
Specifications
r
EnginelTransaxle BP SOHC 1 BP DOHC Turbo
ATX I
Item MTX MTX 1 Radiator I
Width 647 +
+
Core size
mm (in) H etght 390 t *-
Depth 16 25 e
Fm pnch
mm (in) 1.3 t c
Heat dissipaton capacity kcallh
38,800 43,800 C
Type -
Double tube - Transaxle oil cooler
Heat dissipation capacity
-
kcal/h I 1,650 -
Cooling fan
Number of biades
4 5 +
Outer drameter
mm (in> 320
340 C
Capacity
w-v 80-12 160-12 c
Current
A
1 I 6.6 * 1 Hi : 13.3 + 7 0% max. + Lo: 8.8 + 10% max.
93GOEX-708
OIL COOLER (ATX
;ECTION A-A
4WD MODEL ZWD MODEL
I
DEPTH E-7