1991 MAZDA MIATA Factory Service Manual

Fig. 11: Exploded View of Alternators
Courtesy of MAZDA MOTORS CORP.

1991 Mazda MX-5 Miata
ALTERNATOR & REGULATOR 1990-92 ELECTRICAL Alternators & Regulators - Mitsubishi
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1990-91 ENGINE COOLING
Cooling System Specifications - MX-5 Miata
COOLING SYSTEM SPECIFICATIONS
COOLING SYSTEM SPECIFICATIONS
ApplicationSpecification
Coolant Replacement Interval30 Months Or 30,000 Miles
Coolant Capacity6.3 qts. (6.0L)
Pressure Cap11-15 psi (0.75-1.05 kg/cm2 )
Thermostat Open Temperature
Starts
Main Valve188-193°F (86.5-89.5°C)
Sub Valve182-188°F (83.5-86.5°C)
Fully Open212°F (100°C)
Thermostat Open Lift
Main Valve0.31" (8 mm)
Sub Valve0.06" (1.5 mm)

1991 Mazda MX-5 Miata
1990-91 ENGINE COOLING Cooling System Specifications - MX-5 Miata

1991 Mazda MX-5 Miata
1990-91 ENGINE COOLING Cooling System Specifications - MX-5 Miata
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1990-91 DRIVE AXLES
Differentials & Drive Axles - 929, B2200, B2600i, MX-5 Miata, MPV, Protege & RX-7
AXLE RATIO & IDENTIFICATION
See AXLE RATIO SPECIFICATIONS . To determine axle ratio, divide number of ring gear teeth by number
of pinion teeth.
AXLE RATIO SPECIFICATIONS
DESCRIPTION
An optional Limited Slip Differential (LSD) is available on Miata and RX7 models. Rear drive axles are
retained in the housing by tapered bearings and bearing retainers at axle housing outer ends on B2200 and
B2600i. Rear drive axle bearings on MPV 4WD are held in place by a pressed-on collar.
On front axle on B2600i (4WD) and MPV 4WD, and rear axle on Miata, Protege 4WD, RX7 and 929, drive
axles use CV joints to connect differentials to drive hubs.
LUBRICATION
CAPACITY
Application
No. of Teeth
Pinion/Ring Gear
Ratio
B220011/433.91:1
B2600i
Front & Rear11/413.73:1
MiataN/A4.30:1
MPV (Front & Rear)
A/T10/414.01:1
M/T11/433.91:1
Protege & 929N/AN/A
RX7
A/T (1) 11/433.9:1 or 4.1:1
M/T Non-TurboN/A4.1:1 or 4.3:1
M/T TurboN/A4.1:1
(1)Non-Turbo convertible only.
NOTE: For models with independent suspension, see REAR AXLE SHAFTS (vehicles
that are normally only FWD), or AXLE SHAFTS
- FRONT article in this section
for axle shaft overhaul.

1991 Mazda MX-5 Miata
1990-91 DRIVE AXLES Differentials & Drive Axles - 929, B2200, B2600i, MX-5 Miata, MPV, Protege & RX-7

1991 Mazda MX-5 Miata
1990-91 DRIVE AXLES Differentials & Drive Axles - 929, B2200, B2600i, MX-5 Miata, MPV, Protege & RX-7
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DIFFERENTIAL CAPACITY SPECIFICATIONS (1)
FLUID TYPE
DIFFERENTIAL LUBRICATION SPECIFICATIONS
(1)
TROUBLE SHOOTING
See TROUBLE SHOOTING - BASIC PROCEDURES article in the TROUBLE SHOOTING Section.
REMOVAL & INSTALLATION
REAR AXLE SHAFTS & BEARINGS
Removal (B2200 & B2600i)
1. Raise and support vehicle. Remove rear wheels. Remove brake drum and shoes. Using a dial indicator,
measure axle flange lateral movement. If bearing play is not within specification, bearing shim must be
adjusted during installation. See END PLAY SPECIFICATIONS
.
2. Disconnect brake line from wheel cylinder. Plug line openings. Disconnect parking brake cable. Remove
backing plate retaining nuts. Remove axle shaft and backing plate as an assembly.
ApplicationQts. (L)
B2200 (Front & Rear)1.3 (1.2)
B2600i
Front1.6 (1.5)
Rear1.8 (1.7)
Miata.69 (.65)
MPV 2WD1.6 (1.5)
MPV 4WD
Front1.8 (1.7)
Rear1.6 (1.5)
Protege 4WD.69 (.65)
RX7
Non-Turbo1.4 (1.3)
Turbo1.5 (1.4)
9291.4 (1.3)
(1)Fill to lower edge of filler plug hole.
ApplicationSpecification
Above 0°F (-18°C)GL-5/SAE 90W
Below 0°F (-18°C)GL-5/SAE 80W
(1)Fill to lower edge of filler plug hole.

1991 Mazda MX-5 Miata
1990-91 DRIVE AXLES Differentials & Drive Axles - 929, B2200, B2600i, MX-5 Miata, MPV, Protege & RX-7
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3. Using Bearing Nut Wrench (49 0603 635A ) and Shaft Holder (49 S120 645A ), remove bearing lock nut
from axle shaft. Remove bearing and bearing retainer from axle using Puller (49 S120 520A ). Remove
outer race from hub.
END PLAY SPECIFICATIONS
(1)
Installation
1. Press new oil seal and bearing outer race into bearing retainer. Coat bearing race and outer seal with
grease. Tap inner oil seal flush with end of axle housing. Coat inner seal lip with grease.
2. Position brake backing plate onto axle shaft. Install spacer against backing plate with chamfer facing
backing plate. Using Press Attachment (49 S120 748 ) and a press, install wheel bearing onto axle shaft.
Standard press force is 4.6-6.7 tons (4200-6100 kg). If press fit force is too high or too low, replace the
bearing collar or shaft.
3. Using Bearing Nut Wrench (49 0603 635A ), install bearing lock nut to axle shaft and tighten to 145-217
ft. lbs. (196-245 N.m). Bend tab up into groove. Install one axle shaft into axle housing. Tighten backing
plate nuts to specification. Install dial indicator on backing plate and check drive axle end play.
4. To adjust end play, remove axle and insert appropriate size adjustment shim between axle hub and
housing. End play for second drive axle installed should be set to normal end play clearance of .002-
.010" (.05-.25 mm), with both axles installed.
5. Install parking brake cable, attaching pin and brake line. Install brake shoes and actuating hardware.
Bleed brake system. Install wheel and tire.
BEARING RETAINER SHIMS (B2200 & B2600i)
MPV 4WD
NOTE: On B2200 and B2600i, left axle bearing lock nut has left-hand threads.
ApplicationIn. (mm)
B2200 & B2600i
One Axle Installed.026-.037 (.65-.95)
Both Axles Installed.002-.010 (.05-.25)
(1)Check at axle flange with dial indicator.
NOTE: Ensure end play for first drive axle is within specification before inserting
second drive axle. Use shims to adjust end play if necessary.
Part NumberThickness In. (mm)
083 26 165.004 (.10)
083 26 166.006 (.15)
083 26 167.020 (.50)
083 26 168.030 (.75)

1991 Mazda MX-5 Miata
1990-91 DRIVE AXLES Differentials & Drive Axles - 929, B2200, B2600i, MX-5 Miata, MPV, Protege & RX-7
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1. Raise and support vehicle. Remove rear wheels. Remove brake drum and shoes. Using a dial indicator,
measure axle flange lateral movement. Replace bearing if play exceeds If bearing play exceeds .023" (.57
mm). Disconnect brake line from wheel cylinder. Plug line openings. Disconnect parking brake cable.
2. Remove backing plate retaining nuts. Remove axle shaft and backing plate as an assembly. Use puller or
slide hammer to pull axle and bearing from axle housing. With axle removed, remove retaining ring and
bearing collar. See Fig. 1
.
Fig. 1: Exploded View of Rear Drive Axle (MPV; Others Similar)

Courtesy of MAZDA MOTORS CORP.
3. To remove bearing collar, grind collar until a section of it is .020" (.5 mm) and cut through it with a
chisel. Use a puller or press to remove bearing and brake backing plate. Check axle shaft for straightness.
Maximum runout is .059" (1.5 mm).
4. Use a press to replace wheel studs (if necessary), never use a previously used wheel stud as a
replacement. Lubricate seal lips before replacement. DO NOT lubricate bearing retainer collar before
replacement. Use a press to install bearing collar. If press-fit of collar requires less than 2.7 tons (2699
kg.) replace collar or axle shaft. Reverse removal procedures to complete installation.
DIFFERENTIAL ASSEMBLY

1991 Mazda MX-5 Miata
1990-91 DRIVE AXLES Differentials & Drive Axles - 929, B2200, B2600i, MX-5 Miata, MPV, Protege & RX-7
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Removal (Front - B2600i & MPV 4WD)
1. Raise and support vehicle. Remove engine skid plate. Drain differential. On MPV 4WD, remove tie rod
end and lower arm. Remove front axle shafts. See AXLE SHAFTS
- FRONT article. Mark drive shaft
position, and remove drive shaft.
2. On B2600i, remove differential subframe mounting bolts and nuts. Remove differential, Remote Free
Wheel (RFW) and subframe assembly from vehicle. Remove RFW assembly from right side of
differential housing. Pull drive coupler from carrier. Remove differential carrier retaining bolts. Remove
differential carrier.
3. On MPV 4WD, remove differential housing mounting bolts and mount at end of Remote Free Wheel
(RFW) extension housing. Remove differential and extension housing from vehicle. Remove RFW
assembly from right side of differential housing. Pull drive coupler from carrier. Remove differential
carrier retaining bolts. Remove differential carrier.
Installation
To install, reverse removal procedure. See Fig. 2 or Fig. 3 . Apply Sealant (8527 77 739 ) to carrier mating
flange. Align marks made during removal. Refill differential with lubricant. Tighten all fasteners to
specification. See TORQUE SPECIFICATIONS
.

1991 Mazda MX-5 Miata
1990-91 DRIVE AXLES Differentials & Drive Axles - 929, B2200, B2600i, MX-5 Miata, MPV, Protege & RX-7
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Fig. 2: Installing Front Differential (B2600i)
Courtesy of MAZDA MOTORS CORP.

1991 Mazda MX-5 Miata
1990-91 DRIVE AXLES Differentials & Drive Axles - 929, B2200, B2600i, MX-5 Miata, MPV, Protege & RX-7
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