1987 MAZDA 626 lock

PCV SYSTEM 4A
POSITIVE CRANKCASE VENTILATION
(PCV)
SYSTEM
Air cleaner pcv valve
76G04A-131
This system reburns the blow-by gases and operates while the engine is running to reduce emissions.
PCV VALVE
Inspection
1. Warm up the engine to the normal operating tem-
perature and run it at idle.
2. Disconnect the PCV valve and the ventilation hose
from the cylinder head cover.
3. Block the PCV valve and check that the engine
speed drops.
4. Replace the PCV valve if necessary.
76G04A-132
4A—67

DECELERATION CONTROL SYSTEM 4B
86U04A-126
76G04B-092
76G04B-093
Lock nutLg*
rJpM
Lever-V- y"
4. Increase the engine speed to 4,000 rpm, then sud-
denly decrease the engine speed.
5. Check that the red indicator lamp stays illuminat-
ed during deceleration.
Dashpot
Preparation
Before checking this system, follow these directions.
• Switch OFF all accessories.
• Connect a tachometer to the check connector.
• Warm up the engine to normal operating tem-
perature.
Inspection
1. Open the throttle valve fully and push the dashpot
rod with a finger. Check that the rod goes into the
dashpot slowly.
2. Release the rod and check that it comes out
quickly.
Adjustment
1. Warm up the engine and run it at idle.
2. Connect a tachometer to the engine.
3. Increase the engine speed to 2,500 rpm.
4. Slowly decrease the engine speed and check that
the dashpot rod touches the lever at 1,900—2,100
rpm.
5. If not within specification, loosen the lock nut and
adjust by turning the dashpot.
76G04B-094
4B-67

4B EEC SYSTEM
Water Thermo Valve
1. Remove the water thermo valve.
2. Immerse the valve in a water-filled container.
3. Heat the water gradually and observe the tem-
perature.
4. Blow through the valve from one vacuum port and
verify that air comes out of the other port at
46—54°C (115—129°F).
86U04A-147
Three-way
check valve
86U04A-148
To canister
Pressure valve
3<> A To tank
Vacuum valve
Air filter
Three-Way Check Valve
1. Remove the check valve.
2. Blow through the valve from port A, and check that
air comes out of port B.
Next, block port B and check that air comes out
of port C.
3. Block port B.
4. Connect a vacuum pump to port A and verify that
no vacuum is held.
86U04A-149
Solenoid valve (Purge control)
Solenoid Valve (Purge control)
1. Remove the solenoid valve.
76G04B-128
4B-78

4B CONTROL SYSTEM
y
/OTaWX 1
rx
Throttle stop screw
76G04B-117
76G04B-11E
Counter clockwise i i
Clockwise
76G04B-119
3. Place a feeler gauge between the lever and the
throttle stop screw and check that the SST buzz-
er sounds or that there is continuity between ter-
minals B and D.
Feeler gauge 0 mm (0 in) 0.7 mm (0.028 in)
Buzzer Sounds Does not sound
Lamp ON OFF
Continuity YES NO
4. If not correct, adjust the throttle sensor as outlined
below.
Adjustment
1. Disconnect the connector and connect the SST
to the throttle sensor.
2. Place a 0.40 mm (0.016 in) feeler gauge between
the lever and the throttle stop screw.
3. Loosen the two attaching screws.
4. Rotate the throttle sensor clockwise about 30°, then
rotate it counterclockwise until the buzzer sounds.
5. If it does not buzz, replace the throttle sensor.
6. If it does buzz, substitute the feeler gauge with a
0.55 mm (0.022 in) gauge
7. Check that the buzzer does not sound.
8. If it buzzes, repeat steps 3 to 7.
If it still buzzes, replace the throttle sensor.
9. Tighten the two attaching screws.
Note
Be careful not to disturb the throttle sensor
position when tightening the screws.
10. Open the throttle valve fully a few times; then
recheck the adjustment of the throttle sensor.
11. Disconnect the SST from the throttle sensor and
reconnect the connector.
76G04B-120
4B-96

EEC SYSTEM 4C
76G04C-157
76G04C-158
Three-way
check valve
86U04A-148
BO
To canister
Pressure valve
O A To tank
Vacuum valve
Air filter
86U04A-149
No. 2 Purge Control Valve
1. Disconnect vacuum hose D from the evaporation
pipe.
2. Blow through the hose and verify that air flows
freely.
Vacuum Switch Valve
1. Remove the vacuum switch valve.
2. Connect a vacuum pump to the valve.
3. Blow through the valve from port A and verify that
air comes out of port B when vacuum is applied.
Specified vacuum:
66—106 mmHg (2.6—4.2 inHg)
Three-Way Check Valve
1. Remove the check valve.
2. Blow through the valve from port A, and check that
air comes out of port B.
Next, block port B and check that air comes out
of port C.
3. Block port B.
4. Connect a vacuum pump to port A and verify that
no vacuum is held.
4C—83

4D OUTLINE
OUTLINE
The Mazda 626 offers two diesel engines; a Comprex supercharged RF-CX engine, and a normally
aspirated RF-N engine.
SPECIFICATIONS
—Engine model
Item ———
ECE UK, GENERAL —Engine model
Item ——— RF-CX RF-N
Fuel tank Capacity liters (US gal, Imp gal) 60 (15.9, 13.2)
Fuel filter Type Cartridge, paper element
Sedimenter Type With detector
Injection pump
Type Bosch VE distributor
Injection pump
Manufacturer Diesel Kiki Co,, Ltd.
Injection pump
Direction of rotation Clockwise Injection pump
Drive method Timing belt
Injection pump
Plunger diameter mm (in) 9.0 (0.35) 8.0 (0.31)
Injection pump
Cam lift mm (in) 2.2 (0.087)
Injection nozzle Type Throttle Injection nozzle
Injection pressure kPa (kg/cm2, psi) 13,240 (135 , 1,920)
Injection timing ATDC
1
° TDC 0°
Idle speed rpm 720 _+f0
Fast idle speed (A/C ON) rpm 700-750
Cold start device Engine speed rpm 1.100 Cold start device
Advance degree 6°
Air cleaner Type Cartridge, paper element Air cleaner Type
Wet Dry
PCV system Type Open Closed
76G04D-002
4D—2

ON-VEHICLE MAINTENANCE 4D
INJECTION TIMING
1. Disconnect the negative battery cable.
2. Release the CSD using the screw driver.
3. Remove the cover on the clutch housing.
4. Turn the flywheel and set the indicator at TDC.
5. Disconnect the injection pipes from the injection
pump.
76G04D-008
6. Remove the hydraulic head plug from the injec-
tion pump.
7. Mount the SST into the plug hole on the hydraulic
head so the tip of the dial gauge pointer touches
the plunger end of the pump and the dial gauge
indicates approx. 2.0 mm (0.08 in).
76.G04D-009
8. Turn the crankshaft slowly counterclockwise to
30—50° BTDC.
9. Make sure the dial indicator pointer no longer
moves by slightly turning the crankshaft.
10. Set the dial gauge scale to Zero at the pointer.
76G04D-010
11. Turn the crankshaft clockwise to align the indica-
tor pin at ATDC 1° (RF-CX), TDC 0° (RF-N).
12. Read the dial gauge.
Cam lift: 0.98—1.02 mm (0.038—0.040 in)
13. If not within the specification, adjust the injection
timing. (Refer to page 4D—24.)
76G04D-011
4D-5

FUEL SYSTEM 4D
RF-CX
o
M
o
10-
RF-N
M
m
M
o TO"
5-
76G04D-059
76G04D-060
76G04D-061
3. Turn the crankshaft, and align the flywheel indica-
tor pin at ATDC 10 (RF-CX), or TDC 0° (RF-N).
4. Turn the injection pump until the dial indicator in-
dicates 1 mm (0.04 in).
Note
Refer to page 4D—4 for initial setting of the
dial indicator.
Cam Height Inspection
1. Set the SST into the injection pump as for injec-
tion timing adjustment. (Refer to page 4D—4.)
2. Turn the crankshaft clockwise and read the maxi-
mum difference of the indicator value, which gives
the cam height.
Cam height: 2.2 mm (0.08 in)
76G04D-062
4D—25