1987 MAZDA 626 torque

4B FUEL SYSTEM
Pressure Regulator
1. Disconnect the vacuum hose and fuel return hose.
2. Remove the pressure regulator.
3. Install in the reverse order of removal.
Tightening torque:
8—11 N-m (0.8—1.1 m-kg, 69—95 in-lb)
76G04B-084
Pulsation Damper
1. Loosen the pulsation damper and remove it.
2. Install in the reverse order of removal.
76G04B-085
^-Fuel hose
ML*? ^-Fuel pump
^silntank filter
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76G04B-086
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Fuel Filter
Low pressure side
Refer to page 4B—57.
86U04A-116
High pressure side
The fuel filter must be replaced at the intervals out-
lined in the maintenance schedule.
Warning
Always work away from sparks or open
flames.
1. Disconnect the fuel hoses from the fuel filter.
2. Remove the fuel filter and the bracket.
3. Install a new filter and the bracket.
4. Connect the fuel hoses.
Note
When installing the filter, push the fuel hoses
fully onto the fuel filter and secure the hoses
with spring clamps.
4B-60

4B FUEL SYSTEM
Inspection
1. Check the fuel tank for cracks and corrosion.
2. If any defect is found, repair or replace the tank.
Warning
Before repairing, clean the fuel tank thorough-
ly with steam to sufficiently remove all explo-
sive gas.
86U04A-118
Installation
Install in the reverse order of removal, referring to the installation note.
Torque Specifications
22—30 N-m (2.2—3.1 m-kg, 16—22 ft-lb)
4B—62
86U04A-119

4B EXHAUST SYSTEM
REMOVAL AND INSTALLATION
1. Remove in the sequence shown in the figure.
2. Install in the reverse order of removal.
Torque Specifications
1. Main silencer
2. Middle pipe
3. Pre-silencer
86U04A-159
4. Catalytic converter
5. Bracket
6. Front pipe
INSPECTION
1. Check the catalytic converter and exhaust pipe for
deterioration or restriction.
2. Check the insulation covers welded onto the cata-
lytic converter for damage.
Note
If the insulation cover is touching the catalytic
converter housing, excessive heat at the floor
will occur.
86U04A-160
4B—82

4C INTAKE AIR SYSTEM

(4)
Outer washer
©Spacer
ru , ©iNut and spring (2) Throttle lever Washer
69G04C-130
Inner washer
69G04C-131
Outer washer
Spacer
REPLACEMENT
Throttle Lever
Removal
Caution
When loosening the throttle lever nut, hold the
throttle valves fully open to prevent damag-
ing the idle switch.
Remove the throttle lever in the sequence shown in
the figure.
Installation
1. Check that the inner washer is in the proper posi-
tion as shown in the figure.
2. Assemble the spacer and outer washer and install
them onto the throttle shaft.
3. Install the throttle lever onto the throttle shaft.
Caution
When tightening the throttle lever nut, hold
the throttle valves fully closed to prevent
bending the stopper lever.
4. Tighten the throttle lever nut.
Tightening torque:
16—23 N m (1.6—2.3 m-kg, 12—17 ft-lb)
5. Check that the inner and outer washer and spacer
are assembled correctly as shown.
6. Check that No.1 and No.2 throttle valves move
smoothly and that No.2 throttle valve is closed com-
pletely when the No.1 throttle valve is closed.
7. Check the operation of the idle switch.
(Refer to page 4C—106.)
76G04C-061
4C—36

INTAKE AIR SYSTEM 4C
INSTALLATION
Install in the reverse order of removal, referring to the installation note.
Torque Specification
19—26 N-m (1.9—2.6 m-kg, 14—19 ft-lb)
8—11 N-m (0.8—1.1 m-kg, j 69—95 in-lb)
8—11 N-m (0.8—1.1 m-kg, 69—95 ft-lb)
19—26 N-m .9—2.6 m-kg, 14—19 ft-lb)
8—11 N-m (0.8—1.1 m-kg, 69—95 in-lb)
37—52 N-m (3.8—5.3 m-kg, ' 27—38 ft-lb)
4.2—6.2 N-m (43—63 cm-kg, 37—55 in-lb)
19—26 N-n (1.9-2.6 m-kg, 14—19 ft-lb)
B6U04A-D55
4C—37

VIC SYSTEM 4C
VARIABLE INERTIA CONTROL
(VIC)
SYSTEM
The VIC system supplements the intake air's inertial effect to create a torque band that runs from low
rpm through the high rpm range.
The system consists of the intake manifold, shutter valves, dynamic chambers, actuator, one-way check
valve, three-way solenoid valve, and engine control unit.
Shutter valve
Shutter valve
76G04C-065
Intake Inertia Effect
The air within the dynamic chamber and intake manifold begins to flow during the first half of the air
intake process. This air flow pushes air into the cylinder by its own inertial force during the second
half of the air intake process. This improves the charging of the cylinder.
To most effectively put this inertia charging to use, the length of the manifold leading to the dynamic
chamber needs to be changed in response to the engine rpm.
Length of intake manifold Intake inertia effect
Long Effective at low and middle speed
Short Effective at high speed
The VIC system controls the length of the intake manifold travel by switching the shutter valve either
open or closed at the specified engined rpm.
expert22 fl/i* http://rutracker.org
4C—39

4C FUEL SYSTEM
4. Disconnect the main fuel hose from the delivery
pipe assembly.
5. Disconnect the fuel return hose from the fuel re-
turn pipe.
6. Remove fuel return pipe mounting bolt.
76G04C-115
7. Remove the delivery pipe assembly mounting bolts
and insulators.
76G04C-116
Remove the grommets, injectors, and insulators.
Install in the reverse order of removal, referring to
the installation note.
Tightening torque:
Delivery pipe, dynamic chamber, and en-
gine hanger
19—25 N m (1.9—2.6 m-kg, 14—19 ft-lb)
76G04C-117
O-ring Injector / Correct
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Grommet Delivery pipe
Wrong
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Installation note
Injector
1. Use new O-rings.
2. Apply a small amount of engine oil to the O-rings
when installing.
86U04A-108
4C-62

FUEL SYSTEM 4C
3. Install the injectors and the injector insulators.
86U04A-109
O-ring
Grommet
Injector
Insulator
Bolt
,J| Delivery
XM P'pe
\1 \>_ - ( ^ ,r- Insulator
Insulator
Install the insulators between the intake manifold and
the delivery pipe.
76G04C-118
Delivery Pipe
1. Remove the injectors. (Refer to page 4C—61.)
2. Separate the fuel return pipe from the delivery pipe
assembly.
76G04C-119
3. Replace the delivery pipe.
4. Install in the reverse order of removal, referring to
the installation note.
Tightening torque:
Fuel return pipe 8—11 N-m
(0.8—1.1 m-kg, 69—95 in-lb)
76G04C-120
4C-63