1987 MAZDA 626 Workshop Manual

4D EXHAUST SYSTEM
EXHAUST SYSTEM
STRUCTURAL VIEW
1. Exhaust manifold 4. Pre-silencer
2. Comprex supercharger (RF-CX) 5. Main silencer
3. Air funnel assembly
4D-18

EXHAUST SYSTEM 4D
EXHAUST MANIFOLD
Removal and Installation
1. Remove in the sequence shown in the figure.
2. Install in the reverse order of removal.
3. Check for exhaust leakage.
Inspection
1. Check the exhaust manifold for cracks and
damage.
2. Inspect the flatness of the mounting surface using
the straight edge and a feeler gauge. Replace if
necessary.
Distortion: 0.05 mm (0.002 in) max.
1. Comprex supercharger (Refer to page 4D—13.: only RF-CX)
2. Exhaust manifold
4D—19

EXHAUST SYSTEM 4D
EXHAUST PIPE AND MAIN SILENCER
Removal and Installation
1. Remove in the sequence shown in the figure.
2. Install in the reverse order of removal.
3. Check for exhaust leakage.
64—89 N-m
37—52 N-m (3.8—5.3 m-kg, 27—38 ft-lb)
76G04D-045
1. Front exhaust pipe bracket 4. Silencer hanger
2. Front exhaust pipe 5. Middle pipe
3. Pre-silencer 6. Main silencer
4D—20

FUEL SYSTEM 4D
FUEL SYSTEM
STRUCTURAL VIEW
RF-CX
RF-N
76G04D-046
1. Fuel tank
2. Fuel filter
3. Fuel injection pump
4. Fuel injection nozzle
5. Sedimenter
4D—21

4D FUEL SYSTEM
76G04D-047
76G04D-048
76G04D-049
FUEL FILTER
On-Vehicle Inspection
Check for water in the fuel filter. If present drain the
water. (Refer to page 4D—4.)
Replacement
Removal
1. Disconnect the water level sensor connector (ECE).
2. Remove the water level sensor. (ECE).
3. Remove the fuel filter cartridge.
Warning
Keep fire and open flame away from the fuel
area.
Installation
1. Apply fuel to the O-ring of the fuel filter cartridge
and install it onto the filter body.
2. Install the water level sensor (ECE).
3. Connect the water level sensor connector (ECE).
4. Bleed air from fuel filter. (Refer to page 4D—4.)
5. Check for fuel leakage.
SEDIMENTER (GENERAL)
On-Vehicle Inspection
Check for water in the sedimenter. If present, drain
the water. (Refer to page 4D—4.)
4D—22

FUEL SYSTEM 4D
Replacement
1. Remove the sedimenter from the body.
2. Apply fuel to a new O-ring, and install it onto the
sedimenter body with water level sensor.
76G04D-051
WATER LEVEL SENSOR
Inspection
1. Remove the water level sensor.
(ECE)
Remove the water level sensor from the fuel filter.
(GENERAL)
Remove the water level sensor from the sedimenter
body.
76G04D-052
2. Check the water level sensor for continuity with an
ohmmeter. Replace if necessary.
ECE
Continuity : Pulled condition
No continuity: Pushed condition
76G04D-053
GENERAL
Continuity : Pushed condition
No continuity: Pulled condition
3. Apply fuel to a new O-ring and install it onto the
sensor.
4. Install the water level sensor to the fuel filter (ECE)
or the sedimenter (General).
5. Check for fuel leakage.
76G04D-054
4D-23

4D FUEL SYSTEM
INJECTION PUMP
On-Vehicle Inspection
Fuel cut solenoid valve
1. Run the engine at idle.
2. Disconnect the solenoid valve connector, and let
the engine stop.
3. If the engine does not stop, replace the fuel cut
solenoid valve.
76G04D-055
Pick up coil
1. Disconnect the pick up coil connector.
2. Check for continuity of the coil using an ohmmeter.
3. Replace it if there is not continuity.
76G04D-056
O
o
>=
=<
t= —i V
' 1 -4
n
5-
U
o
1 mm (0.39 in) Injection Timing Adjustment
Inspection
Check the injection timing. (Refer to page 4D—5.)
Injection timing
RF-CX: ATDC 10
RF-N : TDC 0°
76G04D-057
Adjustment
1. Loosen the injection pump mounting nut.
2. Loosen the injection pump bracket bolt.
76G04D-058
4D—24

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