oil pressure MAZDA 626 1987 Repair Manual

7B TROUBLESHOOTING (G4A-HL)
Line Pressure Test
Preparation
1. Connect the SST to the line pressure output point
(square head plug L).
2. Connect a tachometer to the engine.
3. Perform the preparation procedure shown in STEP
3 (STALL TEST).
STEP 6 (OIL PRESSURE TEST)
This step checks line, throttle, and governor pressures to check the operation of hydraulic compo-
nents and for oil leakage.
83U07B-047
Procedure
76G07B-062
1. Start the engine and check that the idle speed is 900 rpm.
2. Shift the selector lever to D range.
3. Read the line pressure at idle.
4. Depress the brake pedal firmly with the left foot and gradually depress the accelerator pedal with
the right foot.
5. Read the line pressure as soon as the engine speed becomes constant, then release the accelera-
tor pedal.
Caution
Steps 4 to 5 must be performed within 5 seconds.
5. Shift the selector lever to N range and run the engine at idle for at least one minute.
6. Read the line pressure at idle and engine stall speeds for each range in the same manner.
7B—58

TROUBLESHOOTING (G4A-HL) 7B
Specified Line pressure:
Condition Line pressure kPa (kg/cm2, psi)
Range DSL R
When idling 350-490 (3.6-5.0, 51-71) 600-830 (6.1-8.5, 87-121)
At stall speed 980-1230 (10.0—12.5, 142—178) 1470-1960 (15.0-20.0, 213-284)
76G07B-063
Evaluation
Condition Possible Cause
Below specification
In all ranges
Worn oil pump
Below specification
In all ranges
Fluid leakage from the oil pump, control valve body
and/or transaxle case
Below specification
In all ranges Stuck pressure regulator valve
Below specification
In all ranges
Stuck throttle valve
Below specification
In all ranges
Stuck pressure modulator valve
Below specification
In D, 2 and 1 range
Fluid leakage from the forward clutch hydraulic circuit
Below specification
In D, 2 and 1 range Fluid leakage from the governor valve hydraulic circuit
Below specification
In D, 2 and 1 range
Fluid leakage from the N-R accumulator seal rings
Below specification In D and 1 range Fluid leakage from the 2-3 accumulator seal rings Below specification In D and 1 range Fluid leakage from the 1-2 accumulator seal rings Below specification
In D and R range Fluid leakage from the N-D accumulator seal rings
Below specification
In 2 and 1 range Fluid leakage from the coasting clutch hydraulic circuit
Below specification
In 2 and 1 range Stuck throttle backup valve
Below specification
In R and 1 range Fluid leakage from the low and reverse brake hydraulic
circuit
Below specification
In 2 range only Fluid leakage from 2-4 brake servo hydraulic circuit
Below specification
In 1 range only Stuck low reducing valve
Below specification
In R range only Fluid leakage from reverse clutch hydraulic circuit
Excessive line pressure
Stuck throttle valve
Excessive line pressure Stuck throttle modulator valve Excessive line pressure Stuck pressure regulator valve Excessive line pressure
Stuck throttle backup valve
76G07B-216
7B—59

7B ON-VEHICLE MAINTENANCE
Installation
Install in the reverse order of removal referring to in-
stallation note.
Installation note
Control valve body
Install the control valve body.
Tightening torque: 11—15 N-m
(110—150 cm-kg, 95—130 in-lb)
86U07B-083
Note
a) To place the manual plate in the correct po-
sition of the manual valve, shift into "R" be-
fore installation.
b) Verify that the manual plate and manual
valve are assembled correctly by using a
mirror, then tighten the mounting bolts.
86U07B-084
w v
ATF level
After installation, add ATF, and with the engine idling,
check the fluid level and for leaks.
(Refer to page 7B—71)
76G07B-100
Throttle cable
Adjust the throttle cable with the oil pressure test.
86U07B-086
7B-78

INSPECTION AND REPAIR 7B
6. Check for the clutch operation as follows.
(1) Set the clutch assembly onto the oil pump.
(2) Check the clutch operation by applying com-
pressed air through the fluid passages as
shown.
Applied air pressure:
392 kPa (4.0 kg/cm2, 57 psi)
86U07B-217
(3) Pour in ATF so that the reverse piston, coast-
ing clutch drum, and coasting clutch piston are
fully submerged.
86U07B-218
(4) Check that no bubbles come from between the
piston and drum seal when applying com-
pressed air through the fluid passages as
shown.
Caution
The compressed air must be under 392 kPa
(4.0 kg/cm2, 57 psi), and should not applied
for over 3 seconds.
86U07B-219
7. Apply petroleum jelly to the thrust bearings to se-
cure them; then install them on both sides of the
reverse and forward drum.
Thrust bearing outer diameter
Oil pump side: 86.0 mm (3.39 in)
Small sun gear and one-way clutch side:
56.1 mm (2.21 in)
86U07B-220
7B-121

INSPECTION AND REPAIR 7B
Inspection
Check the following and replace any faulty parts.
1. Damaged or worn valves
2. Damaged oil passage
3. Cracked or damaged valve body
4. Operation of each valve
5. Weakened spring
Spring

Spring name Outer dia.
mm
(in) Free length
mm (in)
Wire dia.
mm
(in) Spring color
Pressure modifier spring 8.3 (0.327) 26.5 (1.043) 0.8 (0.031)
—

Low reducing spring 8.7 (0.343) 38.3 (1.508) 0.9 (0.035) Black
1-2 shift spring 8.7 (0.343) 41.3 (1.626) 1.0 (0.039) Yellow
2-3, 3-4 shift spring 7.4 (0.291) 36.6 (1.441) 0.8 (0.031) Gray
Throttle backup spring 9.65 (0.380) 26.9 (1.059) 0.55 (0.022) Red
Throttle modulator spring 6.3 (0.248) 47.9 (1.886) 0.8 (0.031)
—

Throttle assist spring 5.15 (0.203) 32.3 (1.272) 0.55 (0.022) Dark green
Throttle spring 5.4 (0.213) 47.2 (1.858) 0.8 (0.031) Pink
Converter relief ball spring 6.9 (0.272) 24.1 (0.949) 0.9 (0.035) Maroon
Orifice check valve spring 5.0 (0.197) 12.5 (0.492) 0.23 (0.009)
—
76G07B-219
]
Assembly
1. Install the throttle adjust plug, throttle assist spring,
throttle valve, and throttle plug assembly.
86U07B-288
Caution
Install the throttle plug assembly with the
groove aligned with the bolt hole.
86U07B-289
7B-145

7B INSPECTION AND REPAIR
Inspection
Check the following and replace any faulty parts.
1. Damaged or worn valves
2. Damaged oil passage
3. Cracked or damaged valve body
4. Operation of each valve
5. Weakened spring
Spring

Spring name Outer dia.
mm
(in) Free length
mm
(in) Wire dia.
mm (in)
Spring color
Pressure regulator spring 11.5 (0.453) 26.5 (1.043) 1.0 (0.039) Maroon
Lock-up control spring 5.0 (0.197) 35.2 (1.386) 0.6 (0.024) Purple

86U07B-295
Assembly
1. Install the lock-up control spring, lock-up control
valve, stopper plug, and stopper pin.
86U07B-296
Install the pressure regulator valve, pressure regu-
lator spring, pressure regulator spring seat, pres-
sure regulator plug, pressure regulator plug sleeve,
pressure regulator backup plug, stopper plug, and
stopper pin.
Note
Install the stopper plug larger end first.
86U07B-297
3. Install the manual valve.
86U07B-298
7B-148

INSPECTION AND REPAIR 7B
Inspection
Check the following and replace any faulty parts.
1. Damaged or worn valves
2. Damaged oil passage
3. Cracked or damaged valve body
4. Operation of each valve
5. Weakened spring
Spring

Spring name Outer dia.
mm (in)
Free length
mm
(in)
30.7 (1.209)
46
2
(1 819)
52
3
(2.059)
Wire dia.
mm (in)
Spring color
Blue
Yellow
Red"
Pressure regulator spring 9.5 (0.374)
Free length
mm
(in)
30.7 (1.209)
46
2
(1 819)
52
3
(2.059)
0.7 (0 028)
0
8
(0.031)
1.0 (0.039)
0.8 (0.031)
Spring color
Blue
Yellow
Red"
Lock-up control spring 7,3 (0 287)
Free length
mm
(in)
30.7 (1.209)
46
2
(1 819)
52
3
(2.059)
0.7 (0 028)
0
8
(0.031)
1.0 (0.039)
0.8 (0.031)
Spring color
Blue
Yellow
Red"
Lock-up support spring 7.0 (0.276)
Free length
mm
(in)
30.7 (1.209)
46
2
(1 819)
52
3
(2.059)
0.7 (0 028)
0
8
(0.031)
1.0 (0.039)
0.8 (0.031)
Spring color
Blue
Yellow
Red" OD lock-up spring 7.1 (0.280) 66.5 (2.618)
0.7 (0 028)
0
8
(0.031)
1.0 (0.039)
0.8 (0.031)
Spring color
Blue
Yellow
Red"

76G07B-166
Assembly
1. Install the lock-up support spring, lock-up support
valve, stopper plug, and stopper pin.
Note
Install the stopper plug large end first.
83U07B-305
2. Install the pressure regulator valve, pressure regu-
lator spring, pressure regulator spring seat, pres-
sure regulator plug, pressure regulator plug sleeve,
pressure regulator backup plug, stopper plug, and
stopper pin.
Note
Install the stopper plug large end first.
83U07B-306
7B—169

INSTALLATION 7B
86U07B-453
86U07B-454
76G07B-198
20. Install the tie-rod ends and cotter pins.
Tightening torque:
29—44 N-m (3.0—4.5 m-kg, 22—33 ft-lb)
21. Install the oil cooler outlet and inlet hoses.
22. Install the splash shields.
Tightening torque:
8—11 N-m (80—110 cm-kg, 69—95 in-lb)
23. Install the front wheels.
Tightening torque:
88—118 N-m (9—12 m-kg, 65—87 ft-lb)
24. Connect the throttle cable.
Note
Adjust the throttle cable with the oil pressure
test. (Refer to page 7B—75, 76)
25. Connect the selector cable.
Tightening torque:
Nut
29—39 N-m (3.0—4.0 m-kg, 22—29 ft-lb)
Bolts
16—22 N-m (1.6—2.3 m-kg, 12—17 ft-lb)
26. Connect the ground wires to the transaxle case.
Tightening torque:
8—11 N-m (80—115 cm-kg, 69—99 in-lb)
86U07B-456
7B—219

OD
IV) K>
2-4 brake band
—Coasting clutch pressure brake pressure
To oil cooler
N-R accumulator 12-3 accumulator
2-3 Timingr valve 18 Coasting bypass valve Bypass valve Servo control y valve (Blocked)
Pressure modifier valve (Blocked)
3-4 shift valve
Low reducing valve
Pressure regulator valve 3-2 timing valve 3-2 Icapacity valve
Manual valve
Throttle valve
Oil pump
• Throttle pressure
1 Throttle modulated pressure
• Line pressure
I Torque converter pressure Forward clutch pressure\^
Reverse clutch pressure—_____
1-2 accumulator
Throttle back-up valve (Blocked)
-j Throttle J modulator I valve
Apply side 9
Lock-up control valve
-< O
u >
o
o
J3 o
Q >
• m
-< o
3D >
C n
O
O
J3 o
a •C* > • m
-si
CD

Apply side 9
Throttle pressure
Throttle modulated pressure
Line pressure
Operating line pressure

1
Torque converter pressure
30 >
Z o m
U)
< O X >
o
o

55
o
0 >
1 m
I Oil pump