A/T and M/T - 4EAT/MTX Gear Noise/Wear/Failure
9210ford01
Article No.
92-2-7
01/16/92
TRANSAXLE - 4EAT AND MTX - GEAR NOISE OR GEAR WEAR/FAILURE AND POOR QUALITY SHIFTING - VEHICLES BUILT PRIOR TO 8/1/91
FORD: 1991 ESCORT
LINCOLN-MERCURY: 1991 TRACER
ISSUE: Transaxle final drive noise may be heard and gear wear/failures along with poor quality shifting (4EAT) also may be experienced. These conditions occur because the differential pinion shaft may not provide sufficient lubrication to the differential and side gears.
ACTION: Perform the following evaluations and, if necessary, replace the differential or 4EAT/MTX transaxle assembly.
1. Evaluate the vehicle to determine the level of differential noise and poor shifting (4EAT). Also, check the fluid level, color and odor for evidence of contamination.
NOTE: IF THE FLUID CONDITION AND/OR VISUAL INSPECTION INDICATES AN INTERNAL GEAR WEAR/FAILURE, PROCEED WITH TRANSAXLE REMOVAL, DISASSEMBLY AND INSPECTION AS OUTLINED IN STEP 4. IF THE FLUID IS OK, PROCEED TO STEP 2 FOR 4EAT UNITS OR STEP 3 FOR MTX UNITS.
2. If the 4EAT fluid is OK, perform the line pressure test as outlined in the Service Manual.
NOTE: IF THE 4EAT TRANSAXLE THROTTLE CABLE REQUIRED AN ADJUSTMENT TO LINE PRESSURE AND THIS RESOLVED THE CONCERN, ROAD TEST AND RETURN THE VEHICLE TO THE OWNER. IF THE NOISE WAS EXPERIENCED, PROCEED TO STEP 4.
3. Road test and evaluate the shift concerns. Also, listen for abnormal final drive gear noise, especially on corners.
4. If gear noise is evident, proceed as follows:
^ 4EAT GEAR NOISE - If the gear noise concern on 4EAT units requires transaxle removal and disassembly, refer to the 1991 Escort/Tracer Service Manual, Section 07-01 for repair details.
^ MTX GEAR NOISE - Refer to the 1991 Escort/Tracer Service Manual, Section 07-03, for service details about the manual transaxles.
5. Perform the following inspections of the internal components of the final drive differential gear assembly. A complete replacement of the 4EAT/MTX assembly will be required if...
^ The final drive differential assembly is seized.
^ Broken, cracked, or chipped gears are found.
^ A cracked/broken pinion shaft or differential case or a damaged transaxle assembly case (housing) is observed.
Refer to the parts block of this TSB article for correct parts usage.
6. Repair or replacement of the differential assembly could be required if there is excessive wear of the differential gear and side gears, or there is too much pinion shaft to bore clearance.
7. If the differential gear assembly required replacement, inspect the internal components of the transaxle for contamination. Clean and flush as needed. Also, flush the oil cooler(s) and lines.
8. If the 4EAT transaxle required repairs, be sure to inspect the valve body for contamination and metal particles.
a. Disassemble and clean as needed.
b. Refer to the Parts Catalog/Micro fiche for the vehicle application for parts or parts kit needed.
9. After completing all repairs, reassembly, installation, line pressure adjustments (4EAT), road test for proper operation and shifting.
PART NUMBER PART NAME CLASS
F1CZ-4026-A Differential Assy. (1.8L 4EAT) C
F1CZ-4026-B Differential Assy. (1.9L 4EAT) C
F0CZ-7000-A 4EAT Transaxle (1.8L) C
F0CZ-7000-B 4EAT Transaxle (1.9L) C
F1CZ-7002-C MTX Transaxle (1.8L) C
F1CZ-7002-B MTX Transaxle (1.9L, Pony) C
F1CZ-7002-A MTX Transaxle (1.9L) C
OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: Eligible Under Basic Warranty
Coverage, Major Component
Warranty Coverage,
Powertrain Warranty
Coverage
OPERATION DESCRIPTION TIME
920207A Road Test, Check 0.8 Hr.
Transmission Fluid, Adjust
Line Pressure
920207B Road Test, Check 7.1 Hr.
Transmission Fluid, Remove
Transaxle And Overhaul
Differential Assembly - 4EAT
And 1.8L
920207C Road Test, Check 6.8 Hr.
Transmission Fluid, Remove
Transaxle And Overhaul
Differential Assembly -
4EAT And 1.9L
920207D Road Test, Check 6.8 Hr.
Transmission Fluid, Remove
Transaxle And Replace
Differential Assembly - 4EAT
And 1.8L
920207E Road Test, Check 6.5 Hr.
Transmission Fluid, Remove
Transaxle And Replace
Differential Assembly - 4EAT
And 1.9L
920207F Road Test, Check 4.7 Hr.
Transmission Fluid, Replace
Transaxle Assembly And
Flush Cooling Lines - 4EAT
And 1.8L
920207G Road Test, Check 4.4 Hr.
Transmission Fluid, Replace
Transaxle Assembly
And Flush Cooling Lines - 4EAT
And 1.9L
920207H Replace MTX Transaxle 3.8 Hr.
Assembly - 1.8L
920207I Replace MTX Transaxle 3.4 Hr.
Assembly - 1.9L
DEALER CODING
BASIC PART NO. CONDITION CODE
4026 56
OASIS CODES: 501000, 502000, 503000, 503300,
504000, 505000, 505200, 509000,
597997