1987 MAZDA 626 oil pressure

15 WARNING AND SENDER
86U15X-068
86U15X069
86U15X-070
Door Switch
1. Check for continuity of the switch with an
ohmmeter.
2. If continuity is not as specified, replace the switch.
Washer Level Sensor
1. Check for continuity between C (LY) terminal and
D (B) terminal of the washer level sensor con-
nector.
Oil Pressure Switch
1. Disconnect the connector from the oil pressure
switch.
2. Check for continuity between the switch and a
body ground with each condition.
Coolant Level Sensor
1. Remove the level sensor and connect the con-
nector.
2. With the sensor not grounded to the body, start
the engine.
3. After checking that the warning light illuminates,
ground the threaded part of the sensor.
4. If the warning light remains illuminated, the sen-
sor is faulty and replace it.
73G15X-013
15—40

Engine Continuity
Running Yes
Stop No
Terminals Float level Continuity
C (LY)—D
(B)
Bottom Yes C (LY)—D
(B)
Above bottom No

2. If continuity is not as specified, replace the sensor.

OUTLINE 16
TROUBLESHOOTING GUIDE
Problem Probable cause Remedy Reference page
No blower
1. Main fuse (30
A) is
open Replace
operation
2 Malfunction
of
the blower motor Replace 3. Faulty resistor Replace 4. Malfunction
of
the blower switch Replace 5. Open
or
loose connection
in an
electrical circuit Repair 16—6,
7
Insufficient
1. Obstruction
in
the inlet
of
the blower unit Remove the obstruction 16-26
air
2. Clogged evaporator Clean the evaporator
with compressed
air
16-27 3. Frosted evaporator Check the thermostat 16-30 4. Air leakage Check for leakage
at
16-26 both sides
of
the cool-
ing unit

Compressor
1. Malfunction
of
the A/C relay Check operation 16—30
does not run,
2. Malfunction
of
the thermostat Check operation 16—30
or runs
3. Malfunction
of
the refrigerant-pressure switch Check operation 16—31
insufficiently
4.
Air
conditioner fuse (15
A)
failure Replace 5. Compressor drive belt
is
loose Readjust 16—23
6. Internal problem
of
the compressor Repair
or
replace
the
16—13
compressor 7. Battery voltage too low Recharge the battery 8. Layer short
in
the magnet coil Replace 9. Clutch face dirty with
oil
Clean
or
replace the 16-13
clutch 10. Excessive gap between the drive plate and
the
Adjust the gap 16-13
pulley
11. Open circuit
in
the magnet coil Replace 16—13
12 Open circuit Repair 16-6,
7
Refrigeration
Normal pressures are:

pressure is
High pressure
1472—1765 kPa
abnormal (15—18 kg/cm2, 214—255 psi)
Low pressure
197—294 kPa
(2—3 kg/cm2, 29—42 psi)
when: ambient temperature 35°C (95°F)
engine speed 1,500
rpm
Low pressure
1. Internal malfunction
of
the compressor Repair
or
replace the 16-13

is too high
compressor
2. Faulty contact
of
the sensing bulb
of
the expan-Repair 16-26
sion valve 3. Faulty insulation
of
the sensing bulb
of
the expan-Repair 16—26
sion valve
4. Expansion valve open too much Replace 16—26

Low pressure
1. Insufficient refrigerant Charge with refrigerant 16-8

is too low
2. Receiver-drier
is
clogged Replace 16-25
3. Expansion valve
is
clogged Replace 16-26
4. Faulty thermostat Check operation 16-30 5. Frosted piping Clean
or
replace the 16—29
piping

High pres-
1. Poor cooling
of
condenser Check and clean 16-24

sure is too
2. Loose cooling fan drive belt Readjust 16—23

high
3. Too much refrigerant Discharge the excess 16-8
refrigerant 4.
Air in
the system Evacuate and charge 16-8
the system

High pres-
1. Insufficient refrigerant Charge with refrigerant 16-8
sure is too
2. Internal malfunction
of
the compressor Repair
or
replace the 16-13

low
compressor

76G16X-004
16—5

OUTLINE 16
Discharging the Refrigeration System
1. Connect the manifold gauge set to the system.
2. Place the free end of the center hose on a shop
towel.
3. Slowly open the high pressure manual valve to ad-
just the refrigerant flow. Open the valve only slightly.
Caution
If refrigerant is allowed to escape too fast, the
compressor oil will be drawn out of the
system.
4. Check the shop towel to make sure no oil is being
discharged.
If oil is present, partially close the manual valve.
5. After the manifold gauge reading drops below 343
kPa (3.5 kg/cm2, 50 psi), slowly open the low
pressure manual valve.
6. As the system pressure drops, gradually open both
the high- and low-pressure manual valves until both
gauges read 0 kPa (0 kg/cm2, 0 psi).
76G16X-631
Evacuation of the Refrigeration System
Whenever the air-conditioning system has been ex-
posed to the atmosphere, it must be evacuated.
1. Connect the manifold gauge set.
2. Connect the center hose of the gauge set to the
vacuum pump inlet.
3. Operate the vacuum pump, then open both man-
ual valves.
4. When the low pressure gauge indicates approxi-
mately 710 mmHg (28 inHg), close both manual
valves and stop the vacuum pump.
5. Check to be sure that the degree of pressure does
not change after 10 minutes or more in this condi-
tion.
If
the pressure changes, check the system for
leaks, and repair if necessary.
6. If no leaks are found, once again operate the vacu-
um pump and open both manual valves to obtain
760 mmHg (30 inHg).
7. Close both manual valves, and stop the vacuum
pump.
Disconnect the hose from the vacuum pump.
69G16X-019
16-9

COMPRESSOR 16
69G16X-026
M10X1.25^45
Low-pressure x pressure
hose hose Compressor
COMPRESSOR
ON-VEHICLE INSPECTION
1. Connect the manifold gauge set.
2. Run the engine at 1,500 rpm.
3. Check the compressor flow:
a) High pressure is not low and low pressure is not
higher than normal.
b) Metallic sound.
c) Check to be sure that the high-pressure and low-
pressure gauges show the same value immedi-
ately after the air conditioner is switched OFF.
If both gauges show the same value immediate-
ly, it can be assumed that the gasket or the valve
inside the compressor is damaged.
4. Stop the engine.
5. Check the shaft seal and others for leakage.
6. Inspect the drive plate pulley magnetic clutch for
signs of oil.
7. Check the clearance between the drive plate and
pulley. (Refer to page 16—21.)
If any of the above checks reveal faults, repair the
compressor or magnetic clutch.
76G16X-635
Bracket No.2 Adjusting Bolt Bracket

, ,shaft

' stay _ M8XI. 25^20 MIO X 1.25 Compressor
69G16X-028
REMOVAL OF COMPRESSOR
1. Perform the Oil Return Operation. (See below.)
2. Disconnect the battery ground cable.
3. Disconnect the clutch lead wire from the wiring
harness.
4. Discharge the refrigerant from the refrigeration
system.
5. Disconnect the two flexible hoses. Plug the open
fittings immediately to keep moisture out of the
system.
6. Loosen the drive belt.
7. Remove the compressor mounting bolts and the
compressor.
Bracket No.1 M
to* 1.25

^Compressor
MIOxl. 25^110 MIOxl. 25^125
Oil Return Operation
1. If the refrigerant level is low, charge the system to
the specified amount.
2. Run the engine and air conditioner at idle and at
maximum cooling for at least 20 minutes.
76G16X-636
16—13

1 6 COOLING UNIT
INSTALLATION OF COOLING UNIT
1. Install the cooling unit by using the two nuts.
Note
Adjust and position the unit so that its con-
nections match those of the heater unit and
the blower unit.
2. Connect the drain hose.
76G16X-625
Sealing plate
Heater I _ .. ' . . - V
unit Evaporator dealing plate Blower unit
3. Join the connections on both sides by using the
seal plates.
4. Connect the A/C harness to the cooling unit.
76G16X-626
76G16X-627
5. Connect the liquid line high-pressure pipe and suc-
tion low-pressure pipe to the cooling unit.
Tightening torque:
15—22 Nm (1.5—2.5 m-kg, 11—18 ft-lb)
6. Install the instrument lower panel, shower duct and
glove box.
7. If the evaporator is replaced, add compressor oil
to the compressor.
Compressor oil: 50 cc (3.05 cu in)
16-28

30 TECHNICAL DATA
Item Engine model FE 12-valve

Top 0.20—0.35 (0.008-0.0138)
End gap measured
in
cylinder
mm
(in) Second 0.15—0.30 (0.006-0.012) End gap measured
in
cylinder
mm
(in) Oil (rail) 0.20-0.70 (0.008-0.0276)
Maximum 1.0 (0.039)
Top 1.52-1.54 (0.0598-0.0606)
Ring groove width
in
piston mm (in) Second 1.52-1.54 (0.0598-0.0606)
Oil 4.02-4.04 (0.1583-0.1591)
Top 0.03—0.07 (0.0012—0.0028) Clearance
ot
piston ring
to
ring Second 0.03—0.07 (0.0012-0.0028)
Maximum 0.15(0.006)

Piston pin

Diameter mm (in) 21.974-21.980 (0.8651-0.8654)
Interference
in
connecting
rod
mm (in) 0.013-0.037 (0.0005-0.0015)
Piston
to
piston pin clearance mm (in) 0.008-0.024 (0.0003—0.0009)
Installation pressure N (kg,
lb)
4,900-14,700 (500-1,500, 1,100-3,300)

Connecting rod and connecting rod bearing

Length (Center
to
center) mm (in) 151.95—152.05 (5.982—5.986)
Twisting and bending mm (in) 0.06 (0.0024) max.
Small end bore mm (in) 21.943—21.961 (0.8640-0.8646)
Big end bore mm (in) 54.002-54.017 (2.1261—2.1266)
Big end width mm (in) 26.838-26.890 (1.0566—1.0587)
Connecting rod side clearance
mm
(in) Standard 0.110-0.262 (0.004-0.010) Connecting rod side clearance
mm
(in) Maximum 0.30 (0.012)

Crankshaft

Crankshaft runout mm (in) Maximum 0.03 (0.0012)
Standard size 59.937-59.955 (2.3597—2.3604)
0.25 (0.010) Standard 59.693-59.711 (2.3501-2.3508)
Main journal diameter mm (in)
undersize No.3 59.687-59.705 (2.3499-2.3506) Main journal diameter mm (in) 0.50 (0.020) No. 1,2,4,5 59.443-59.461 (2.3403-2.3410) Main journal diameter mm (in) undersize No.
3
59.437-59.455 (2.3400-2.3407)
0.75 (0.030) No. 1,2,4,5 59.193-59.211 (2.3304-2.3311)
undersize No.
3
59.187-59.205 (2.3302-2.3309)
Main journal taper and out-of-round mm (in) Maximum 0.05 (0.0020)
Standard 50.940-50.955 (2.0055-2.0061)
Crankpin diameter 0.25 (0.010) undersize 50.690—50.705 (1.9957-1.9963)
mm (in) 0.50 (0.020) undersize 50.440-50.455 (1.9858-1.9864)
0.75 (0.030) undersize 50.190-50.205 (1.9760-1.9766)
Crankpin taper and out-of-round
mm (in)
Maximum 0.05 (0.0020)

Main bearing

No. 1,2,4,5 Standard 0.025-0.043 (0.0010—0.0017)
Main journal bearing
oil
No. 1,2,4,5 Maximum 0.08 (0.0031) clearance
mm
(in) No.
3
Standard 0.031—0.049 (0.0012—0.0019) No.
3
Maximum 0.08 (0.0031)
Available undersize bearing mm fin} 0.25 (0.010), 0.50 (0.020), 0.75 (0.030)

Crankpin bearing

Crankpin bearing
oil
clearance
mm
(in) Standard 0.027-0.067 (0.0011-0.0026) Crankpin bearing
oil
clearance
mm
(in) Maximum 0.10 (0.0039)
Available undersize bearina mm (in) 0.25 (0.010), 0.50 (0.020), 0.75 (0.030)

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)
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)
0.50 (0.020) oversize 28.12-28.17 (1.107-1.109)
0.75 (0.030) oversize 28.20—28.25 (1.110—1.112)

30—4

TECHNICAL DATA 30
—Engine model
Item -
FE 8-valve
F8 F6
—Engine model
Item -
ECE Middle East General
F8 F6

0.75 (0.030) oversize
—
81.694—81.714
(3.2163-3.2171)
1.00 (0.039) oversize
—
81.944—81.964 (3.2261-3.2269)
Piston and cylinder clearance
mm
(in) Standard 0.036-0.075 (0.0014—0.0030) Piston and cylinder clearance
mm
(in) Maximum 0.15 (0.0059)

Piston ring

Thickness
mm
(in) Top 1.47-1.49 (0.0579-0.0587) Thickness
mm
(in) Second 1.47-1.49 (0.0579—0.0587)
End gap measured
in
cylinder
mm (in)

Top 0.20—0.35 (0.008—0.0138)
End gap measured
in
cylinder
mm (in)
Second 0.15-0.30 (0.006-0.012) End gap measured
in
cylinder
mm (in)
Oil (rail) 0.20—0.70 (0.008—0.0276) End gap measured
in
cylinder
mm (in)

Maximum 1.0 (0.039)
Ring groove width
in
piston
mm
(in)
Top 1.52—1.54 (0.0598-0.0606)
Ring groove width
in
piston
mm
(in) Second 1.52-1.54 (0.0598-0.0606) Ring groove width
in
piston
mm
(in)
Oil 4.02-4.04 (0.1583-0.1591)
Clearance
of
piston ring
to
ring
groove
mm
(in)
Top 0.03-0.07 (0.0012-0.0028) Clearance
of
piston ring
to
ring
groove
mm
(in) Second 0.03-0.07 (0.0012-0.0028) Clearance
of
piston ring
to
ring
groove
mm
(in) Maximum 0.15 (0.006)

Piston pin

Diameter
mm
(in) 21.974—21.980 (0.8651—0.8654)
Interference
in
connecting
rod mm
(in) 0.013—0.037 (0.0005—0.0015)
Piston
to
piston pin clearance
mm
(in) 0.008—0.024 (0.0003-0.0009)
Installation pressure
N
(kg,
lb)
4,900—14,700 (500—1,500, 1,100—3,300)

Connecting rod and connecting rod bearing

Length (Center
to
center)
mm
(in) 151.95-152.05 (5.982-5.986) 135.95—136.05
(5.352-5.356)
Twisting and bending
mm
(in) 0.06 (0.0024) max.
Small end bore
mm
(in) 21.943-21.961 (0.8640-0.8646)
Big end bore
mm
(in) 54.002-54.017 (2.1261—2.1266)
Bia end width
mm
(in) 26.838-26.890 (1.0566—1.0587)
Connecting rod side clearance
mm
(in) Standard 0.110-0.262 (0.004—0.010) Connecting rod side clearance
mm
(in) Maximum 0.30 (0.012)

Crankshaft

Crankshaft runout mm (in)
I
Maximum 0.03 (0.0012)
Main journal diameter
mm (in)
Standard size 59.937-59.955 (2.3597—2.3604)
Main journal diameter
mm (in)
0.25 (0.010) undersize
Standard 59.693—59.711 (2.3051—2.3508)
Main journal diameter
mm (in)
0.25 (0.010) undersize No.
3
59.687—59.705 (2.3499-2.3506) Main journal diameter
mm (in) 0.50 (0.020) undersize
No. 1,2,4,5 59.443-59.461 (2.3403—2.3410) Main journal diameter
mm (in) 0.50 (0.020) undersize No.
3
59.437-59.455 (2.3400—2.3407)
Main journal diameter
mm (in)
0.75 (0.030)
undersize
No. 1,2,4,5 59.193-59.211 (2.3304—2.3311)
Main journal diameter
mm (in)
0.75 (0.030)
undersize No.
3
59.187—59.205 (2.3302—2.3309)
Main journal taper and out-of-round mm (in) Maximum 0.05 (0.0020)
Crankpin diameter mm (in)
Standard 50.940-50.955 (2.0055-2.0061)
Crankpin diameter mm (in)
0.25 (0.010) undersize 50.690-50.705 (1.9957-1.9963) Crankpin diameter mm (in) 0.50 (0.020) undersize 50.440-50.455 (1.9858-1.9864) Crankpin diameter mm (in)
0.75 (0.030) undersize 50.190—50.205 (1.9760-1.9766)
Crankpin taper and out-of-round
mm
(in) Maximum 0.05 (0.0020)

Main bearlna

Main journal bearing
oil
clearance
mm
(in)
No. 1,2,4,5 Standard 0.025-0.043 (0.0010-0.0017)
Main journal bearing
oil
clearance
mm
(in)
No. 1,2,4,5 Maximum 0.08 (0.0031) Main journal bearing
oil
clearance
mm
(in) No.
3
Standard 0.031—0.049 (0.0012—0.0019)
Main journal bearing
oil
clearance
mm
(in) No.
3
Maximum 0.08 (0.0031)
Available undersize bearina
mm
(in) 0.25 (0.010), 0.50 (0.020), 0.75 (0.030)

Crankpin bearing

Crankpin bearing
oil
clearance
mm
(in) Standard 0.027-0.067(0.0011 -0.0026) Crankpin bearing
oil
clearance
mm
(in) Maximum 0.10 (0.0039)
Available undersize bearing
mm
(in) 0.25 (0.010), 0.50 (0.020), 0.75 (0.030)

30-7

TECHNICAL DATA 30
Item Engine model RF-CX RF-N
Connecting rod and connecting rod bearing

Length (Center
to
center) mm (in) 151.95-152.05 (5.9823—5.9862)
Maximum twisting and bending mm (in) 0.080 (0.0031)
per 50
(1.969)
Small end bushing inner diameter mm (in) 30.014-30.030 (1.1817-1.1823) 25.014-25.030 (0.9848-0.9854)
Big end bore mm (in) 54.002-54.017 (2.1261-2.1266)
Big end width mm (in) 25.900—26.100 (1.0197—1.0276)
Connecting rod side clearance mm (in) Standard 0.11-0.262 (0.0043-0.0103) Connecting rod side clearance mm (in) Maximum 0.30 (0.012)

Crankshaft

Crankshaft runout mm (in) 0.05 (0.002) max.
Standard Standard 59.937-59.955 (2.3597-2.3604)
size Minimum 59.89 (2.358)
0.25 (0.010) Standard 59.687-59.705 (2.3499-2.3506)
Main journal diameter undersize Minimum 59.64 (2.348) mm (in) 0.50 (0.020) Standard 59.437-59.455 (2.3400-2.3407)
undersize Minimum 59.39 (2.338)
0.75 (0.030) Standard 59.187-59.205 (2.3302-2.3309)
undersize Minimum 59.14 (2.328)
Main journal taper and out-of-round mm (in) 0.05 (0.002) max.
Standard Standard 50.940-50.955 (2.0055—2.0061)
size Minimum 50.89 (2.004)
0.25 (0.010) Standard 50.690-50.705 (1.9957-1.9963)
Crankpin diameter undersize Minimum 50.64 (1.994) mm (in) 0.50 (0.020) Standard 50.440-50.455 (1.9858—1.9864)
undersize Minimum 50.39 (1.984)
0.75 (0.030) Standard 50.190-50.205 (1.9760-1.9766)
undersize Minimum 50.14 (1.974)
Crankpin taper and out-of-round mm (in) 0.05 (0.002) max.

Main bearing

Main journal bearing
oil
clearance Standard 0.031-0.050 (0.0012-0.0020)
mm (in) Maximum 0.08 (0.0031)
Available undersize bearina mm fin) 0.25 (0.010), 0.50 (0.020), 0.75 (0.030)

Crankpin bearing

Crankpin bearing
oil
clearance mm (in) Standard 0.027-0.055 (0.0011-0.0022) Crankpin bearing
oil
clearance mm (in) Maximum 0.08 (0.0031)
Available undersize bearing mm (in) 0.25 (0.010), 0.50 (0.020), 0.75 (0.030)

Thrust bearina (center main bearina)

Crankshaft end play mm (in) Standard 0.04-0.282 (0.0016—0.0111) Crankshaft end play mm (in) Maximum 0.30 (0.012)
Bearing width mm (in) Standard size 2.00-2.05 (0.0787-0.0807) Bearing width mm (in) Oversize 2.175-2.225 (0.0856-0.0876)

Timing belt

Deflection mm (in)/N (ka,
lb)
9.0-11.5 (0.35--0.45V98 (10,
22)
Drive belt deflection

Alternator mm (in) New 8-10 (0.31-0.39) Alternator mm (in) Used 9-11 (0.35-0.43)
A/C compressor mm (in) New 8.5-9.5 (0.33-0.37) A/C compressor mm (in) Used 9.5-10.5 (0.37-0.41)
Vacuum pump mm (in) New 7.5-8.5 (0.30—0.33) Vacuum pump mm (in) Used 8.5-9.5 (0.33-0.37)
P/S pump with vacuum pump mm (in) New 6.5-7.5 (0.26—0.30) P/S pump with vacuum pump mm (in) Used 7.0-8.0 (0.28—0.31)
Pressure wave supercharger
mm
(in) New 4.0-5.0 (0.16-0.20) Pressure wave supercharger
mm
(in) Used 4.5-5.5 (0.18-0.22)

30—13