differential FORD FESTIVA 1991 User Guide

Fig. 2: Compressing Band Apply Servo

Courtesy of FORD MOTOR CO.
DIFFERENTIAL OIL SEALS R & I
Removal
1. Raise and support vehicle. Drain transaxle fluid. Carefully raise staked portion of axle nut. Apply brakes and loosen, but DO NOT
remove, axle nut. Remove lower control arm ball joint clamp bolt. Pry downward on lower control arm to separate control arm from
knuckle.
2. Insert pry bar between transaxle case and axle flange. Carefully apply force to pry bar until axle circlip is disengaged. Slide knuckle
assembly off axle shaft, and remove axle from vehicle. Quickly install appropriate plug in transaxle. Using appropriate puller, remove
seal.
Installation
1. Apply lubrication to new seal. Using appropriate driver, install seal. Install new circlip on transaxle end of axle. Remove transaxle plug,
and carefully install axle into transaxle. Ensure circlip snaps into retaining groove.
2. Install axle into hub. Install NEW axle nut. Tighten bolts to specifications. See TORQUE SPECIFICATIONS
. Stake NEW axle nut
with blunt nose chisel. To complete installation, reverse removal procedure. Fill transaxle fluid to correct level.
OIL COOLER FLUSHING
Contaminates MUST be removed from oil cooler before transmission is put back into service. Replace cooler supply tubes if leaking.
Thoroughly flush oil cooler and lines if a major service or transaxle removal has occurred. It is recommended that a mechanically agitated
cleaner, such as Rotunda (014-00028), be used.
VACUUM THROTTLE VALVE DIAPHRAGM (MODULATOR) R & I
Removal
1. Drain transaxle fluid. Disconnect vacuum hose from modulator. Unscrew modulator from transaxle. Remove control rod. With beveled
side out, insert Vacuum Diaphragm Rod Gauge (T87C-77000-A) into mounting hole until gauge bottoms out.
2. Place gauge rod through opening of gauge until rod bottoms out against vacuum throttle valve. Tighten lock knob on gauge and remove
tool. Using depth gauge, measure distance from flat surface of gauge to end of rod. See Fig. 3
. Select proper length throttle valve rod.
See THROTTLE VALVE ROD DIMENSION CHART
.
THROTTLE VALVE ROD DIMENSION CHART
Installation
Install selected throttle valve rod. Coat threads of modulator with appropriate sealant. To install, reverse removal procedures.
NOTE:If replacing m odulator, it is necessary to replace throttle control valve rod.
Measurement In. (mm)Applicable Rod Length In. (mm)
1.0 (25.4)1.16 (29.5)
1.0-1.02 (25.4-25.9)1.18 (30.0)
1.02-1.04 (25.9-26.4)1.20 (30.5)
1.04-1.06 (25.9-26.4)1.22 (31.0)
1.06-1.08 (26.9-27.4)1.24 (31.5)
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Differential Noise
ATF contaminated or level incorrect. Bearings worn or has excessive preload. Teeth on gears worn or damaged or has excessive backlash.
TESTING
PARK/NEUTRAL SWITCH TEST
1. Ensure engine starts in "P" or "N". Ensure back-up lights glow when ignition is on and selector lever in "R". If park/neutral switch is not
operating properly, disconnect connector at transaxle and check continuity between terminals. See Fig. 4
. If continuity is not as
indicated, replace park/neutral switch.

Fig. 4: Testing Park/Neutral Switch

Courtesy of FORD MOTOR CO.
KICKDOWN (DOWNSHIFT) SOLENOID TEST
1.Check Fuse

Ensure ignition is off. Inspect condition of 15 amp METER fuse located in interior fuse junction panel. If fuse is okay, go to step 4). If
fuse is blown, go to next step.
2.Check System

Ensure ignition is off. Replace 15 amp fuse. Turn ignition on. If fuse blows, go to next step. If fuse is okay, go to step 4).
3.Check For Short To Ground

Turn ignition off. Remove 15 amp METER fuse. Disconnect kickdown switch harness connector. Check continuity between
Black/Yellow wire terminal of interior fuse holder and ground. If continuity exists, inspect and repair short circuit as needed. If
continuity does not exist, replace 15 amp fuse. Go to next step.
4.Check Power Supply To Kickdown Switch

Ensure ignition is off. Disconnect kickdown switch harness connector. Turn ignition on. Measure voltage between Black/Yellow wire
terminal of kickdown switch harness connector and ground. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less,
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snap ring. Release the "C" clamp and remove the servo piston. See Fig. 2 . R e mo ve go ve r n o r c o ve r a n d p u l l go ve r n o r fr o m t r a n sa xl e
case. Remove transaxle case-to-torque converter housing bolts. Separate case halves.
7. Remove differential assembly. Remove oil pipes and parking pawl assembly. Remove drum hub assembly. Remove one-way clutch inner
race assembly. See Fig. 8
. Remove rear planetary carrier with needle bearing and thrust washer. Before disassembling one-way clutch,
measure and record clearance between one-way clutch and low-reverse brake retaining plate. Clearance should .032-.041" (.8-1.05
mm).
8. Remove snap ring, one-way clutch and low-reverse brake retaining plate. Remove low-reverse brake plates. Compress low-reverse brake
piston with appropriate compressor. See Fig. 9
. Remove snap ring with screwdriver and remove low-reverse brake hub and springs.
Apply air pressure to low-reverse oil passage to remove piston. See Fig. 10
.
9. Remove output bearing and idler support assembly by lightly tapping on idler shaft with a soft-faced hammer. Drive out idler gear roll
pin and remove idler gear from output bearing and idler support. See Fig. 11
. Remove output gear assembly, press out bearing race
from output bearing and idler support and save adjusting shim for reassembly.

Fig. 9: Removing Snap Ring & Low
-Reverse Brake
Courtesy of FORD MOTOR CO.

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Fig. 10: Identifying Transaxle Oil Passages
Courtesy of FORD MOTOR CO.

Fig. 11: Torque Converter Housing Components

Courtesy of FORD MOTOR CO.
COMPONENT DISASSEMBLY & REASSEMBLY
BAND SERVO
Inspection
Remove seal rings and inspect piston for damaged or worn piston. Ensure spring free length is 1.890" (48.00 mm). If less than specified,
replace spring. Install new seal rings on piston and servo retainer.
DIFFERENTIAL
Disassembly
1. Remove ring gear retaining bolts and ring gear. Using hammer and pin punch, drive out roll pin. See Fig. 12. Push out pinion gear shaft.
Remove pinion and side gears, with washers, from differential housing.
2. Using appropriate puller, remove side bearings from differential housing. DO NOT remove speedometer drive gear unless damaged.
Removal will damage speedometer drive gear.
Inspection
Check all gears for signs of excessive wear or damage. Check differential gear case for cracks or other damage. Replace as needed.
Reassembly
1. Reverse removal procedure to reassemble. Measure side gear and pinion gear backlash by inserting drive shafts into differential side
gears and supporting shafts in "V" blocks. Position dial indicator with plunger resting on teeth of pinion gear. See Fig. 13
. Measure
backlash. Repeat procedure with plunger on other pinion gear.
2. Backlash readings should be less than .004" (.10 mm). If backlash is not within specification, adjust backlash by changing thrust
washers. Thrust washers are available in .079" (2.00 mm), .083" (2.10 mm) and .087" (2.20 mm) thicknesses. Use thrust washers of t h e
same thickness on both sides whenever possible.
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Fig. 12: Exploded View Of Differential Assembly

Courtesy of FORD MOTOR CO.

Fig. 13: Measuring Pinion Gear Backlash

Courtesy of FORD MOTOR CO.
DRUM HUB
Disassembly, Inspection & Reassembly
Remove parking gear spring from park gear. Push in the parking gear retaining pins with screwdriver and remove parking gear. See Fig. 14 .
Remove snap ring and lift internal gear assembly from drive hub. Check gear for excessive wear or damage and replace if needed. Reverse
disassembly procedure to reassemble drum hub.
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Fig. 24: Measuring Output Shaft Bearing Preload

Courtesy of FORD MOTOR CO.
3. Unthread gauge tool until output shaft bearings are seated and no play exists. Install Torque Adapter (T87C77000-E) over splined end
of output shaft. Using INCH lb. torque wrench, rotate output shaft while unthreading gauge tool. Unthread gauge tool until 4.42-7.97
INCH lbs. (.5-.9 N.m) of turning torque is obtained.
4. Using feeler gauge, measure gap of gauge tool. Select correct thrust shim(s) that match measured gauge tool gap. Shims are available
from in thicknesses of .004" (.10 mm) to .007" (.18 mm) in .02 mm increments. One shim is available in thickness of .019" (.50 mm).
5. Disassemble output bearing and idler support from converter housing. Remove gauge set and spacers. Install selected shim(s) in output
bearing and idler support. DO NOT exceed 7 shims. Remove bearing race from gauge tool and install race in support. Reassemble
converter housing and output bearing and idler support. Install bolts and tighten retaining bolts to specification. Refer to TORQUE
SPECIFICATIONS .
6. Install Torque Adapter (T87C77000-E) over splined end of output shaft. Using INCH lb. torque wrench, rotate output shaft to confirm
correct bearing preload. Turning torque should be .26-7.96 INCH lbs. (.03-.9 N.m). If turning torque is not within specification, repeat
steps 1) through 6).
7. Once correct output shaft bearing preload is obtained, remove output bearing and idler gear support. Replace idler gear shaft seal on
idler gear shaft. Install idler gear into converter housing. Install output gear and bearing support. Ensure alignment groove in idler gear
shaft is aligned with support ridge of output bearing and idler support.
8. Install new idler gear shaft roll pin. Install output gear and bearing support bolts and tighten bolts to specification. See TORQUE
SPECIFICATIONS .
DIFFERENTIAL BEARING PRELOAD ADJUSTMENT
1. Install differential assembly into converter housing. Position differential side bearing race in recessed end of Gauge Tool (T87C-
770002DJ). Place gauge tool on differential. See Fig. 25
.
2. Ensure gauge tool is completely threaded together so that no gap is present. Position spacer collars and assemble case halves using
supplied bolts and washers of tool set. See Fig. 25
. Tighten bolts to 22-34 ft. lbs. (292D46 N.m).
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Fig. 25: Measuring Differential Bearing Preload

Courtesy of FORD MOTOR CO.
3. Unthread gauge tool until differential bearings are seated. Install Differential Rotator into differential assembly. Using INCH lb. torque
wrench, rotate differential assembly while unthreading gauge tool. Unthread gauge tool until 4.3 INCH lbs. (.5 N.m) of turning torque is
obtained.
4. Using feeler gauge, measure gap of gauge tool. Select correct thrust shim(s) by adding .006" (.15 mm) to measured gauge tool ga p . S h ims
are available from in thicknesses of .043" (1.08 mm) to .079" (2.00 mm) in .040 mm increments.
5. Disassemble case halves. Remove gauge set and spacers. Install selected shim(s) in transaxle case. DO NOT exceed 3 shims. Remove
bearing race from gauge tool and install race in transaxle case. Reassemble transaxle case halves. Install bolts and tighten bolts to
specification. See TORQUE SPECIFICATIONS
.
6. Install Differential Rotator (T88C-77000-L) into differential assembly. Using INCH lb. torque wrench, rotate differential assembly to
confirm correct bearing preload. Turning torque should be 18-25 INCH lbs. (21.-2.8 N.m). If turning torque is not within specification,
repeat steps 1) through 6).
FINAL REASSEMBLY
1. Install low-reverse brake piston by applying even pressure on perimeter of piston while rotating slowly. Install 20 return springs and
low-reverse brake hub. Using appropriate compressor, compress return spring and install snap ring. See Fig. 9
.
2. Install dished plate with small end of dish facing away from piston. Install clutch discs, retainer ring and one-way clutch. Install one-
way clutch machined surface toward retainer ring. Install snap ring.
3. Using a feeler gauge, ensure clearance between one-way clutch and retainer plate is .031-.041" (.80-1.05 mm). If clearance is not within
specification, select correct retainer plate to obtain correct clearance. Retainer plates are available in thicknesses of .063" (1.60 mm)
to .102" (2.60 mm) in .20 mm increments. Apply air pressure to low-reverse oil passage and check for proper clutch operation. See Fig.
10 .
4. Place converter housing on bench with output shaft facing upward. Install needle bearing over output shaft. Install drum hub assembly
onto output shaft spline. Install needle bearing with thrust washer in recess of drum hub. Install rear planetary carrier onto one-way
clutch race. Install snap ring. Install rear planetary assembly into drum hub. Install oil tubes into transaxle case.
5. Install governor into transaxle case. Ensure alignment mark on governor sleeve is aligned with mark on transaxle case. Install go ve r n o r
cover.Tighten bolts to specification. Refer to TORQUE SPECIFICATIONS
. Apply appropriate gasket sealant to converter housing
and install transaxle case. Once case halves are secured in place, ensure all parts previously installed rotate without resistance.
6. Lubricate servo piston with ATF. Assembly servo retainer, piston, piston large seal and spring. Insert assembly into transaxle. Usin g "C"
clamp and socket, compress assembly and install snap ring.
7. Install thrust bearing and thrust washer. Install sun gear shell with sun gear spacer and sun gear. See Fig. 8
. Install front planetary
carrier with thrust washer onto sun gear. Install thrust washer and thrust bearing onto front of front planetary carrier.
8. Install seal sleeve to center of front planetary carrier. Install front ring gear. Install front ring gear needle bearing with rollers facing
upward. Install thrust washer. Match tangs on thrust washer with mating holes in rear clutch assembly.
9. Install rear clutch assembly. Install needle bearing. Companion thrust washer is fitted to oil pump support later in reassembly procedure.
Install front clutch assembly. Install band, band strut and band adjusting stop. Tighten band adjusting stop until band is secured in
place.
TOTAL END PLAY ADJUSTMENT
1. Remove oil pump cover from oil pump housing. Set oil pump housing aside. Coat pump support thrust washer with petroleum jelly and
install on end of pump support. Ensure washer tangs mate with holes in pump support.
2. Install pump cover in front clutch drum. DO NOT have front drum adjusting thrust shim installed. Place a straightedge across transaxle
NOTE:Low/reverse snap ring m ay not have been installed during production. Snap ring is required
during overhaul reassem bly.
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Differential Backlash.004 (.01)
Front Clutch Drum Bushing Diameter1.735 (44.08)
Front Clutch Pack Clearance.063-.071 (1.6-1.8)
Front Drum End Play.020-.031 (.5-.8)
Front Planetary Pinion Clearance.031 (.8)
Low/Reverse Clutch Pack Clearance.032-.041 (.8-1.05)
Oil Pump Gear Clearance.010 (.25)
Oil Pump Sealing Ring Clearance.016 (.40)
Outer Gear-To-Housing Clearance (1) .10 (.25)
Output Gear End Play.003 (.08)
Rear Clutch Pack Clearance.031-.039 (.8-1.0)
Rear Planetary Pinion Clearance.031 (.8)
(1)Oil pump outer gear.
Copyr ight 2009 Mitchell Repair Information Company, LLC. All Rights Reserved.
Article GUID: A00025375
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1. Check pressure plate surfaces for scoring, cracks or discoloration. Remove minor scratches or discoloration with fine emery cloth. Check
pressure plate diaphragm spring fingers for discoloration, scoring, broken or bent segments. Ensure all spring ends are the same height.
2. Check clutch disc lining surface for hardening or presence of oil. Check for worn clutch disc lining. Check for loose lining rivets.
Measure depth of rivet heads. Minimum allowable rivet depth is .012" (0.3 mm). Check for wear or rust on splines. Rust may be
removed with emery cloth.
3. Check flywheel surface for marks, scoring or discoloration. Minor surface repairs may be removed with fine emery cloth. Flywheel must
be machined if scoring, runout, or discoloration is excessive. Maximum flywheel runout is .008" (0.2 mm). Check for damaged or worn
ring gear teeth.
4. Check pilot bearing for wear. Check clutch release/throw out bearing for damage or wear at contact points. Rotate bearing in both
directions and check for binding or abnormal noise.
Installation
1. Replace release bearing and/or pilot bearing as necessary. Clean sealant from flywheel attaching bolt threads. Replace bolts if sealant
cannot be removed. Coat bolt threads with Stud/Bearing Mount Sealer (EOAZ-19554-B ), and install flywheel. Tighten bolts in a
diagonal sequence to specification. See TORQUE SPECIFICATIONS
at the end of this article.
2. Position clutch disc on flywheel with damper springs facing away from flywheel. Hold clutch disc in place with Clutch Aligner (T77F-
7137-A ). Position pressure plate over clutch disc. See Fig. 4
.
3. If reusing original pressure plate, align marks made during removal. Install pressure plate retaining bolts. Alternately tighten bolts to
specification. See TORQUE SPECIFICATIONS
at the end of this article. Remove clutch aligner. Place transaxle on transmission jack.
4. Lightly coat input shaft splines with Clutch Grease (C1AZ-19590-B ). Install transaxle, taking care to align input shaft through the
clutch disc spline. Align clutch housing onto engine guide bushings.
5. Install transaxle lower attaching bolts and tighten to specification. Using transaxle jack, raise transaxle to correct height and tighten
engine bracket bar hook. Install front engine mount and bracket and tighten to specification. Install starter and lower mounting b o l t s,
tighten to specification.
6. Install control rod to transaxle and tighten bolts and nuts to specification. On Festiva, install crossmember and support braces. Install
support braces. On all models, install exhaust hanger to crossmember. Remove transaxle jack.
7. Install new circlips on each half-shaft with gap at top of clip grove and slide into transaxle differential. After circlip snaps into place,
pull outward on hubs to confirm half-shafts are retained by circlip. Install front suspension components, wire harness, underbody and
fender splash shields and front tire assemblies.
8. Connect neutral and back-up light switch and ground wire. Fill transaxle with Mercon ATF transmission fluid to specification. In st al l
and adjust clutch cable or slave cylinder line bracket. Lower vehicle and remove engine support bar. Install speedometer cable into
transaxle.
9. Install battery and/or connect battery cable. Install air cleaner. Adjust pedal free play. See CLUTCH PEDAL FREE PLAY
under
ADJUSTMENTS. Recheck transaxle fluid level and road test vehicle.

Fig. 4: Exploded View Of Clutch Assembly

Courtesy of FORD MOTOR CO.
CLUTCH RELEASE BEARING & FORK
Removal
Remove transaxle. Remove release lever bolt and slide release bearing off. See Fig. 4 . Remove release lever shaft and remove release lever. CAUT ION: T ransaxle alum inum alloy construction requires precise tightening of m ounting bolts. T orque
specifications m ust be strictly adhered to. See T ORQUE SPECIFICAT IONS
.
NOTE:T he clutch release bearing is pre-lubricated and perm anently sealed. DO NOT clean release bearing in
solvent.
Page 3 of 5 MITCHELL 1 ARTICLE - CLUTCH 1988-93 Clutch
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