1987 MAZDA 626 oil

7B INSPECTION AND REPAIR
OIL PUMP
Disassembly
Disassemble in the sequence shown in the figure.
8—11 Nm (82—112 cm-kg, 71—97 in-lb)
24—35 N-m (2.4-3.6 m-kg, 17-26 ft-lb)
1. Bearing race
2. Seal rings
3. Oil pump cover
4. Pump flange
5. Guide ring and guide spring
6. Vane
7. Rotor
8. Spring
86U07B-174
9. Cam ring
10. Pivot roller
11. Seal pin and spring
12. Spring
13. Valve
14. Oil pump body
15. O-ring
Inspection
Check the following and replace any faulty parts.
1. Sliding surfaces of the oil pump cover and oil pump
body for damage or wear
2. Broken or worn seal ring
3. Weakened spring
Free length of springs:
(1) For the cam ring (No. 8)
41.6 mm (1.64 in)
(2) For the valve (No. 12)
35.0 mm (1.38 in)
86U07B-175
7B—108

INSPECTION AND REPAIR 7B
replace the oil pump.
1. Seal pin—Oil pump cover
Standard:
0.005—0.020 mm
(0.0002—0.0008 in)
Maximum: 0.060 mm (0.002 in)
2. Rotor—Oil pump cover
Standard:
0.005—0.020 mm
(0.0002—0.0008 in)
Maximum: 0.030 mm (0.0012 in)
3. Cam ring—Oil pump cover
Standard:
0.005—0.020 mm
(0.0002—0.0008 in)
Maximum: 0.080 mm (0.003 in)
4. Vane—Oil pump cover
Standard:
0.015—0.050 mm
(0.0006—0.0020 in)
Maximum: 0.080 mm (0.003 in)
5. Vane—Rotor groove
Standard:
0.010—0.045 mm
(0.0004—0.0018 in)
Maximum: 0.065 mm (0.0026 in)
5. Wear limit
Check each part for wear; if not within specification, replace the oil pump.
1. Oil pump body sleeve., outer di-
ameter
Standard: 28.00 mm (1.102 in)
2. Rotor bushing.... inner diameter
Standard: 28.00 mm (1.102 in)
Maximum: 28.05 mm (1.104 in)
3. Guide ring outer diameter
Standard: 57.85 mm (2.278 in)
Minimum: 57.70 mm (2.272 in)
4. Valve outer diameter
Standard: 12.00 mm (0.472 in)
Minimum: 11.86 mm (0.467 in)
5. Seal pin outer diameter
Standard: 5.00 mm (0.197 in)
Minimum: 4.90 mm (0.193 in)
4. Clearance
Measure the clearances below; if not within specification,
7B-109

7B INSPECTION AND REPAIR
Assembly
1. Install the valve and spring into the oil pump body,
and check that the valve moves smoothly.
2. Install the plug.
Tightening torque:
24—35 Nm (2.4—3.6 m-kg, 17—26 ft-lb)
86U07B-178
86U07B-179
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3. Install the cam ring and pivot roller onto the oil
pump body.
4. Install the rotor onto the oil pump body.
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5. Install the vanes into the rotor as shown.
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7B—110

INSPECTION AND REPAIR 7B
Guid spring
86U07B-182
86U07B-183
86U07B-184
6. Install the guide spring and guide ring while ex-
panding the vanes toward the cam ring.
7. Install the pump flange onto the rotor.
8. Install the spring between the cam ring and oil
pump body.
9. Install the seal pins and springs with the pins fac-
ing toward the oil pump body.
Note
Install the seal pins round end first.
10. Install the O-rings.
86U07B-185
7R
1 11

7B INSPECTION AND REPAIR
86U07B-186
86U07B-187
11. Install the oil pump cover to the oil pump body.
Tighten the bolts in sequence.
Tightening torque:
8—11 Nm (82—112 cm-kg, 71—97 in-lb)
12. Install the oil pump shaft and check for smooth oil
pump operation.
13. Install the seal rings.
14. Apply petroleum jelly to the bearing race
to
secure
it to the oil pump cover; then install it on the oil
pump cover.
Bearing race outer diameter:
88.0 mm (3.46 in)
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7B—112

INSPECTION AND REPAIR 7B
3. Remove one end of the snap ring from the groove
with snap ring pliers.
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4. Remove the SST from the reverse and forward
drum.
5. Remove the snap ring with a screw driver.
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6. Place the reverse and forward drum on the oil
pump.
7. Remove the reverse piston by applying com-
pressed air through the fluid passage.
86U07B-19G
86U07B-197
Inspection
Check the following and repair or replace any faulty
parts.
1. Drive and driven plates for damage or wear
Drive plate thickness
Standard: 1.6 mm (0.063 in)
Minimum: 1.4 mm (0.055 in)
2. Clutch piston for damage or cracks
3. Clutch drum for damage or deformation
4. Seal contact area for damage
5. Check ball for leaking sticking
6. Broken or worn snap ring
7. Broken or weakened spring
7B—115

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)
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(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
2-4 BRAKE BAND
Inspection
Check the following and replace if necessary.
1. Damaged or worn 2-4 brake band
86U07B-261
BAND SERVO
Inspection
Check the following and replace any faulty parts.
1. Damaged or worn piston
2. Weakened return spring
Free length of spring:
G4A-EL: 43.25 mm (1.703 in)
G4A-HL: FE engine 42.0 mm (1.654 in)
F8 engine 43.25 mm (1.703 in)
76G07B-140
OTHER INSPECTION
Check the following and replace any faulty parts.
1. Damaged or worn output shell
2. Damaged or worn internal gear
3. Damaged or worn turbine shaft
4. Damaged or worn oil pump shaft
5. Damaged or worn anchor strut and shaft
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6. Damaged or cracked valve body cover
7. Damaged or cracked oil pan
8. Damaged or clogged oil strainer
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7B—135