1987 MAZDA 626 compression ratio

4A TROUBLESHOOTING GUIDE
FE 8VALVE—UNLEADED FUEL
The Troubleshooting Guide lists the systems most likely to cause a given symptom. After finding the
system(s) to check, refer to the pages shown for detailed guides for each system.
V POSSIBLE CAUSE
\ PAGE
SYMPTOM
Air

cleaner

(Air

cleaner

element)

Idle

adjustment

Fuel

system
(Carburetor,

Fuel

pump)
PTC

heater

system

Air

injection
system

Positive

crankcase

ventilation

system

Deceleration

control
system
Exhaust
gas

recirculation

(EGR)
system

Exhaust

system
Intake
air

temperature

control
system

Idle-up

control

system
Purge

control

system
Auto-return
choke
system
V POSSIBLE CAUSE
\ PAGE
SYMPTOM 4A-23 4A-38 4A-24 4A—42 4A-58 4A—67 4A—45 4A-96 4A-97 4A—60 4A—68 4A--63 4A—40
1 Hard start or won't start
(Cranks OK) 1 2
2 Engine stalls During warm up 6 1 2 5 3 4 2 Engine stalls After warm up 4 2 3 1
3 Rough Idle During warm up 5 1 2 4 3 6 3 Rough Idle After warm up 4 2 3 1
4 High idle speed after warm up 1 5 4 3 2
5 Poor acceleration, hesitation, or lack of power 1 2 5 3 4
6 Runs rough on deceleratio 2 1
7 Afterburn in exhaust system 2 1
8 Poor fuel consumption 4 1 2 3 5
9 Fails emission test 5 1 6 4 3 2
76G04A-020
The numbers of the list show the priorities of inspections from the most possible to that with the lowest
possibility.
These were determined on the following basis:
• Ease of inspection • Most possible system • Most possible point in system
TROUBLESHOOTING PROCEDURE:
1st Check the following items:
Electrical system
1) Battery condition
2) Fuses
Intake air system
1) Vacuum or air leakage
2) Vacuum hose routing
3) Accelerator cable
4) Choke cable
2nd Check the Fuel and Emission Control Systems
Ignition system
1) Spark plugs
2) Ignition timing
Engine
1) Compression
2) Overheating
Fuel system
1) Fuel level
2) Fuel leakage
3) Fuel filter
4) Idle speed
Others
1) Clutch slippage
2) Brake dragging
4A-22

TROUBLESHOOTING GUIDE 4B
TROUBLESHOOTING GUIDE
This troubleshooting guide shows the malfunction numbers and the symptoms of various failures.
Perform troubleshooting as described below.
Possible cause
Symptom
Input sensors and switches
o> Q.
C
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4B-14
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4B-1S
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4B-16
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co
4B-17
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4B-18
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a) £ a VI o E
4B-19
0 <0 c a> 0) c a> 01
S? o
4B-20
E a> in (0
o 10 A •o 0) 0> u.
4B-21
Output solenoid valves
o «
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0) 0) 01
0> > 10 >
•o o c V o tt)
4B-22
0)
OI

0> > CO >

TJ
O c 0> o CO
4B-23
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4B-23
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4B-23
ffl a 3 • a>
2
a> > 10 >
"O o c a> o
CO Q. >. JO
4B-24
Fault Indicated by SST
Code No. 01 08 09 10 12 14 15 17 25 26 28 34 35
Hard start or won't start
(Cranks OK)
Engine stalls
Rough
idle
While warming up
After warming up
While warming up
After warming up
High idle speed after
warming up
TROUBLESHOOTING PROCEDURE
Note
Step 1 under symptom is to quickly determine what system or unit may be at fault by use of the SST. (Self-Diagnosis Checker 49 H018 9A1)
1st:
Check input sensors and output solenoid valves with the
SST.
(Refer
to
page 4B—10.)

2nd:
Check other switches with the
SST.
(Refer
to
page 4B—26.)

3rd:
Check the following items:

11
Poor acceleration, hesita-
tion or lack of power
Runs rough on deceleration
Afterburn in exhaust system
Poor fuel consumption
Engine stalls or rough after hot starting
Electrical system
1) Battery condition
2) Fuses

Fuel system
1) Fuel level 2) Fuel leakage
3) Fuel filter 4) Idle speed

Engine
1) Compression 2) Overheating

Ignition system

1) Ignition spark 2) Ignition timing

Intake air system
1)
Air
cleaner element 2) Vacuum
or air
leakage 3) Vacuum hose routing
4) Accelerator cable

Others
1) Clutch slippage 2) Brake dragging

Fails emission test 4th:
Check Fuel and Emission Control Systems. (Refer
to
page 4B—8.)

76G04B-003
4B—7

TROUBLESHOOTING GUIDE 4C
TROUBLESHOOTING GUIDE
This troubleshooting guide shows the malfunction numbers and the symptoms of various failures.
Perform troubleshooting as described below.
Input sensors and switches
Possible cause
Page
Symptom and No. CO
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o at e 0) o>
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CM I o
Output solenoid valve
o> > <0 >
2
—.

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(0
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CVI I o
c 0 u « 01 w 3 a
o z «
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"O o c a> o (/)
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Fault Indicated by SST
Code No. 02 03 05 *i 08 09 11 12 *2 15 • 2 17 *2 25 26 *2 27 *2 28 • 2 34 36 • 2 41
Hard start or won't start
(Cranks OK)
Engine stalls
Rough
Idle
During warm up
After warm up
During warm up
After warm up
High idle speed after warm up
Poor acceleration, hesita-tion or lack of power
TROUBLESHOOTING PROCEDURE
Note
Code No. Is to quickly determine which system or unit may be at fault by use of the SST. (Self-Diagnosis Checker 49 H018 9A1 or Digital Code Checker 49 G018 9A0 with Adaptor harness 49 9200 180)
1st: Check input sensors and output solenoid valves with the SST. (Refer to
page
AC—11.)

2nd: Check other switches with the SST. (Refer to page AC—25.)
3rd: Check the following items:
Electrical system
1) Battery condition 2) Fuses
Runs rough on deceleration
Afterburn in exhaust
system
9
10
Poor fuel consumption
Engine stalls or runs
rough after hot starting
11
12
Knocking
Fuel system
1) Fuel level
2) Fuel leakage 3) Fuel filter 4) Idle speed (with test connec-tor grounded)
Engine
1) Compression 2) Overheating
Ignition system 1) Ignition spark
2) Ignition timing (with test connec-tor grounded)
Intake air system 1) Air cleaner element 2) Vacuum or air leakage 3) Vacuum hose routing 4) Accelerator cable
Others 1) Clutch slippage
2) Brake dragging
Fails emission test 4th: Check Fuel and Emission Control Systems. (Refer to page 4C—10.)
*1..
*2„
.Leaded fuel
.Unleaded fuel
76G04C-009
4C—9

30 TECHNICAL DATA
0. MEASUREMENT
Item Engine model Coupe/MX-6 Sedan Hatchback

Overall length mm (in) 4,450 (175.2) 4,515 (177.8) 4,515 (177.8)
Overall width mm (in) 1,690 (66.5) 1,690 (66.5) 1,690 (66.5)
Overall height (14 inch/13 inch) mm (in) 1,360 (53.5)/1,345 (52.9) 1,410 (55 5)/1,395 (54.9) 1,375 (54.1)/1,360 (53 5)
Wheel base mm (in) 2,515 (99.0) 2,575 (101.4) 2,575 (101.4)
Tread (14 inch/13 inch)
mm (in)
Front 1,455 (57.3)/1,460 (57.5) 1,455 (57.3)/(1,460 (57.5) 1,455 (57.3)/1,460 (57.5) Tread (14 inch/13 inch)
mm (in)
Rear 1,465 (57.7)/1,455 (57.3) 1,465 (57.7)/1,455 (57.3) 1,465 (57 7)/1,455 (57 3)
1
A. ENGINE (SOHC)
12-valve
— Engine model Item FE 12-valve
~vpe
Gasoline, 4-cycle
Cylinder arrangement and number In-line, 4-cylinders
Type
of
combustion chamber Pentroof
Valve system OHC, belt-driven
Bore
x
Stroke
mm (in)
86.0
x
86.0 (3.39
x
3.39)
Total piston displacement
cc
(cu
in)
1,998 (121.9)
Compression ratio 9.5
: 1

Compression pressure
kPa (kg/cm2, psi)-rpm
Standard 1,422 (14.5, 206)—280
Compression pressure
kPa (kg/cm2, psi)-rpm
Minimum 996 (10.2, 144)—280 Compression pressure
kPa (kg/cm2, psi)-rpm Maximum difference
between cylinders 196 (2.0,
28)

Valve timing
IN
Open
BTDC 14°
Valve timing
IN Close ABDC 56° Valve timing
EX Open BBDC 69° Valve timing
EX Close ATDC 13°
Valve clearance
mm (in)
IN 0; Maintenance free Valve clearance
mm (in)
EX 0; Maintenance free

Cylinder head

Heiaht
mm (inl
91.95-92.05 (3.620-3.624)
Distortion
mm (inl
Maximum 0.15 (0.006)
Grinding limit
mm (in)
Maximum 0.20 (0.008)

Valve and valve auide

Valve head diameter
mm (in)
IN 32.4-32.6 (1.276—1.283) Valve head diameter
mm (in)
EX 33.9-34.1 (1.335-1.343)
Valve head thickness (margin)
mm (in)
IN 0.8-1.2 (0.031—0.0471 Valve head thickness (margin)
mm (in)
EX 1.3—1.7 (0.051-0.067)
Valve face angle IN 45° Valve face angle EX 45°
Valve length
mm (in)

IN Standard 115.81 (4.55941
Valve length
mm (in)

IN Minimum 115.31 (4.5398) Valve length
mm (in)
cv Standard 116.21 (4.5752)
Minimum 115.71 (4.55551
Valve stem diameter
mm (in)
IN 6.970-6.985 (0.2744-0.2750) Valve stem diameter
mm (in)
EX 6.965-6.980 (0.2742-0.27481
Guide inner diameter
mm (in)
IN 7.01-7.03 (0,2760-0.2768) Guide inner diameter
mm (in)
EX 7.01-7.03 (0.2760-0.27681
Valve stem
to
guide clearance
mm (in)

IN 0.025-0.060 (0.0010-0.0024)
Valve stem
to
guide clearance
mm (in)
EX 0.030-0.065 (0.0012—0.0026) Valve stem
to
guide clearance
mm (in)

Maximum 0.20 (0.00791
Guide projection (Height "A")
mm (in)
19.8-20.3 (0.780-0.799)

30—2

TECHNICAL DATA 30
" Engine model Item FE 12-valve
Timing belt

Belt deflection
mm
(in)/98
N
(10 kg,
22 lb)
5.5—6.5 (0.22-0.26)

8-valve
Engine model
Item -••--.
FE 8-valve F8
F6
Engine model
Item -••--. ECE Middle
East
General
ECE General F6

Type Gasoline, 4-cycle
Cylinder arrangement and number In-line, 4-cylinders
Type
of
combustion chamber Multispherical
Valve system OHC, belt-driven
Bore
x
Stroke
mm
(in) 86.0
x
86.0 (3.39
x
3.39) 86.0
x
77.0
(3.39
x
3.03)
81.0
x
77.0 (3.19
x
3.03)
Total piston displacement
cc
(cu
in)
1,998 (121.9) 1,789 (109.1) 1,587 (96.8)
Compression ratio 8.6
: 1
9.0
: 1

Compression pressure kPa (kg/cm2, psi)-rpm
Standard 1,275 (13.0, 185)—270 1,128 (11.5, 164)—270
Compression pressure kPa (kg/cm2, psi)-rpm Minimum 893 (9.1, 129)—270 790 (8.1, 114)—270 Compression pressure kPa (kg/cm2, psi)-rpm Maximum difference
between cylinders 196 (2.0,
28)

Valve timing
IN Open BTDC 16° 20° 17°
Valve timing
IN Close ABDC 54° 65° 56° Valve timing
EX Open BBDC 54° 65° 64° Valve timing
EX Close ATDC 16° 20° 15°
Valve clearance
mm
(in) IN 0.30 (0.012) Valve clearance
mm
(in) EX 0.30 (0.012)

Cylinder head

Height
mm (in)
91.95-92.05 (3.620-3.624)
Distortion
mm
(in) Maximum 0.15 (0.006)
Grinding limit mm (in) Maximum 0.20 (0.008)

Valve and valve guide

Valve head diameter
mm
(in) IN 43.9-44.1 (1.728-1.736) Valve head diameter
mm
(in) EX 35.9-36.1 (1.413-1.421)
Valve head thickness (margin)
mm
(in) IN 0.8—1.2 (0.031-0.047) Valve head thickness (margin)
mm
(in) EX 1.3-1.7 (0.051-0.067)
Valve face angle IN 45° Valve face angle EX 45°
Valve length
mm
(in)
IN Standard 111.89 (4.4051)
Valve length
mm
(in)
IN Minimum 111.39 (4.3854) Valve length
mm
(in)
EX Standard 111.69 (4.3972) Valve length
mm
(in)
EX Minimum 111.19 (4.3776)
Valve stem diameter
mm
(in) IN 8.030-8.045 (0.3161-0.3167) Valve stem diameter
mm
(in) EX 8.025-8.040 (0.3159-0.3165)
Guide inner diameter
mm
(in) IN 8.07-8.09 (0.3177-0.3185) Guide inner diameter
mm
(in) EX 8.07-8.09 (0.3177-0.3185)
Valve stem
to
guide clearance
mm
(in)
IN 0.025-0.060 (0.0010-0.0024)
Valve stem
to
guide clearance
mm
(in) EX 0.030-0.065 (0.0012-0.0026) Valve stem
to
guide clearance
mm
(in)
Maximum 0.20 (0.0079)
Guide projection (Height "A")
mm
(in) 19.1-19.6 (0.752-0.772)

30-5

30 TECHNICAL DATA
~ ——Engine model
Item —
FE 8-valve
F8 F6
~ ——Engine model
Item —
Middle ECE East General
F8 F6
Thrust bearing (center main bearing)

Crankshaft end play
mm
(in) Standard 0.08-0.18 (0.0031-0.0071) Crankshaft end play
mm
(in) Maximum 0.30 (0.0118)
Bearing width
mm (in)

Standard 27.94-27.99 (1.100-1.102)
Bearing width
mm (in)
0.25 (0.010) oversize 28.04—28.09 (1.104-1.106) Bearing width
mm (in)
0.05 (0.020) oversize 28.12-28.17 (1.107-1.109) Bearing width
mm (in)

0.75 (0.030) oversize 28.20—28.25 (1.110—1.112)

Timing belt

Belt deflection
mm
(in)/98
N
(10 kg,
22 lb)
|5.5—6.5 (0.22-0 26) 4.0-5.0 (0.16-0.20)

1B. ENGINE (DOHC)
— Engine model FE DOHC
Item ~ Leaded fuel Unleaded fuel

Type Gasoline, 4-cycle
Cylinder arrangement and number In-line, 4-cylinders
Type
of
combustion chamber Pentroof
Valve system OHC. belt-driven
Bore
x
Stroke mm (in) 86.0
x
86.0 (3.39
x
3.39)
Total piston displacement cc (cu
in)
1,998 (121.9)
Compression ratio 10.0
: 1
9.2
: 1

Standard 1,422 (14.5, 206)—290 1,373 (14.0, 199)—310
Compression pressure Minimum 996 (10.2, 144)—290 961 (9.8, 139)—310
kPa (kg/cm2, psi)-rpm Maximum difference
between cylinders 196 (2.0, 28)
IN Open BTDC 10° 10°
Valve timing
IN Close ABDC 60° 55° Valve timing
EX Open BBDC 60° 55° EX Close ATDC 10° 10°
Valve clearance mm (in) IN 0; Maintenance free Valve clearance mm (in) EX 0; Maintenance free

Cylinder head

Heiaht mm (in) 133.95-134.05 (5.274-5.278)
Distortion mm (in) Maximum 0.15 (0.006)
Grinding mm (in) Maximum 0.20 (0.008)
HLA
to
cylinder head clearance mm (in) Standard 0.025-0.066 (0.0010-0.0026) HLA
to
cylinder head clearance mm (in) Maximum 0.18 (0.0071)

Valve and valve guide

Valve head diameter mm (in) IN 33.6-33.8 (1.323-1.331) Valve head diameter mm (in) EX 28.8-29.0 (1.134—1.142)
Valve head thickness (margin)
mm
(in) IN 1.0-1.7 (0.039-0.067) Valve head thickness (margin)
mm
(in) EX 1.1—1.7 (0.043—0.067)
Valve face angle IN 45° Valve face angle EX 45°
IN Standard 103.18 (4.0622)
Valve length
mm (in)

IN Minimum 102.68 (4.0425) Valve length
mm (in)

EX Standard 103.94 (4.0921) EX Minimum 103.44 (4.0724)
Valve stem diameter mm (in) IN 5.970-5.985 (0.2350-0.2356) Valve stem diameter mm (in) EX 5.965-5.980 (0.2348—0.2354)
Guide inner diameter mm (in) IN 6.01-6.03 (0.2366-0.2374) Guide inner diameter mm (in) EX 6.01—6.03 (0.2366-0.2374)
IN 0.025-0.060 (0.0010-0.0024)
Valve stem
to
guide clearance mm (in) EX 0.030-0.065 (0.0012-0.0026)
Maximum 0.20 (0.0079)
| Guide projection (Height "A") mm (in) 11.4-11.9 (0.449-0.469)

30-8

TECHNICAL DATA 30
1C. ENGINE (DIESEL)
— _____ Engine model Item . RF-CX RF-N

Type Diesel, 4-cycle
Cylinder arrangement and number In-line, 4-cylinders
Type
of
combustion chamber Swirl chamber
Valve system OHC, belt-driven
Bore
x
Stroke
mm (in)
86.0
x
86.0 (3.39
x
3.39)
Total piston displacement
cc
(cu
in)
1,998 (121.9)
Compression ratio 21.1
: 1 |
22.7
: 1

Compression pressure
kPa (kg/cm2, psi)-rpm
Standard 2,943 (30, 427)-200
Compression pressure
kPa (kg/cm2, psi)-rpm Minimum 2,649 (27, 384)-200 Compression pressure
kPa (kg/cm2, psi)-rpm Maximum difference
between cylinders 294 (3.0,
43)

Valve timing
IN Open BTDC 13° 13°
Valve timing
IN Close ABDC 15° 39° Valve timing
EX Open BBDC 60° 60° Valve timing
EX Close ATDC 8° 8°
Valve clearance
mm
(in) IN Cold: 0.25 (0.010), Warm: 0.30 (0.012) Valve clearance
mm
(in) EX Cold: 0.35 (0.014), Warm: 0.40 (0.016)

Cylinder head

Height mm (in) 133.9-134.1 (5.272-5.280)
Distortion mm (in) 0.10 (0.004) max.
Length
of
cylinder head bolt beiow head
mm
(in)
Standard 113.2—113.8 (4.457—4.480) Length
of
cylinder head bolt beiow head
mm
(in) Maximum 114.5 (4.508)

Combustion chamber insert

Recession
mm
(in) 0.020 (0.0008)
Projection
mm
(in) 0.005 (0.0001)

Valve and valve guide

Valve head diameter
mm
(in) IN 39.3-39.5 (1.547—1.555) 40.9-41.1 (1.610—1.618) Valve head diameter
mm
(in) EX 35.0-35.2 (1.378-1.386) 35.9-36.1 (1.413—1.421)
Valve head thickness (margin)
mm
(in) IN 1.80 (0.071) 0.80 (0.031) Valve head thickness (margin)
mm
(in) EX 1.65 (0.065) 0.80 (0.031)
Valve face angle IN 60° 45° Valve face angle EX 45°
Valve length mm (in) IN 106.9(4.209) Valve length mm (in) EX 106.8 (4.205)
Valve stem diameter
mm
(in) IN 7.970-7.985 (0.3138—0.3144) Valve stem diameter
mm
(in) EX 7.965-7.980 (0.3136-0.3142)
Guide inner diameter mm (in) IN 8.025-8.045 (0.3159—0.3167) Guide inner diameter mm (in) EX 8.025-8.045 (0.3159—0.3167)
Valve stem
to
guide clearance
mm (in)

IN 0.040-0.075 (0.0016-0.0030)
Valve stem
to
guide clearance
mm (in)
EX 0.045—0.080 (0.0018-0.0031) Valve stem
to
guide clearance
mm (in)

Maximum 0.1 (0.004)
Guide projection (Height "A")
mm
(in) 8.3-8.8 (0.327-0.346)

Valve seat

Seat angle IN 60° 45° Seat angle EX 45°
Seat contact width
mm
(in) IN 1.4-1.8 (0.055—0.071) 1.7-2.3 (0.067-0.091) Seat contact width
mm
(in) EX 1.64-2.04 (0.065-0.080) 1.7-2.3 (0.067-0.091)
Seat sinking (Measure valve recession)
mm
(in)
IN Standard 0.75-1.05 (0.030-0.041)
Seat sinking (Measure valve recession)
mm
(in)
IN Maximum 2.55 (0.100) Seat sinking (Measure valve recession)
mm
(in) EX Standard 0.75—1.05 (0.030-0.041) Seat sinking (Measure valve recession)
mm
(in) EX Maximum 2.55 (0.100)

Valve spring

Free length
mm
(in) Standard 45.11 (1.776) Free length
mm
(in) Minimum 44.8 (1.764)

30-11