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Home >> Mazda >> 1990 >> 929 Base >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Overhaul - JATCO E4N71B, L4N71B & JM600, & MAZDA N4A-El & N4A-Hl >> Transmission Reassembly

Transmission Reassembly

  1. Replace "O" rings and seals before reassembly. Lubricate components with ATF during reassembly. Use petroleum jelly to hold components in place (as necessary). Install manual plate and parking rod assembly (if removed). See Fig 1 . Note location of bearing race and thrust washers. See Fig 2 , Fig 3 and Fig 4 .
    Fig 1: Exploded View Of E4N71B, L4N71B, JM600 & N4A-HL/EL
    G00212187Courtesy of MAZDA MOTORS CORP.
    Fig 2: Identifying Bearing, Race & Thrust Washer Locations (N4A-EL)
    G93I23547Courtesy of MAZDA MOTORS CORP.
    Fig 3: Mazda Thrust Washer, Bearing & Race Location (L4N71B, N4A-HL & JM600)
    G00212189Courtesy of MAZDA MOTOR CORP.
    Fig 4: Nissan Thrust Washer, Bearing & Race Locations (E4N71B & L4N71B)
    G00212190Courtesy of MAZDA MOTORS CORP.
  2. Lubricate and install low and reverse piston into main case. See Fig 5 . Mazda (1989-90) low reverse piston return spring free length is measured at .209-.244" (5.30-6.20 mm). See Fig 6 . All models install piston return spring, thrust washer and one-way clutch inner race. Ensure return spring is centered on race and torque bolts to specifications.
    Fig 5: Low & Reverse Brake Assembly
    G00212191Courtesy of MAZDA MOTORS CORP.
    Fig 6: Checking Low Reverse Return Spring
    G93E23550Courtesy of MAZDA MOTORS CORP.
  3. Install low and reverse clutch pack with steel plate first. Alternate friction and steel plates, followed by retaining plate and snap ring. With low and reverse brake assembled, measure clearance between snap ring and retaining plate with feeler gauge. See RETAINER PLATE-TO-SNAP RING SPECIFICATIONS  table. Retaining plate is available in different thicknesses.
  4. Check operation of assembled low and reverse brake by applying air pressure to oil passage. See Figure . Install bearing in rear of transmission. Install oil distributor with governor assembly and bearing race. Insert output shaft. N4A-EL does not use a governor on oil distributor.
  5. Install connecting drum, internal gear and rear planetary pinion carrier as an assembly. Install snap ring on output shaft. Check operation by applying air pressure to oil passage. See Figure .
  6. Install extension housing and ensure output shaft locks with manual lever in "P". Install speedometer pinion assembly. Install rear clutch assembly on top of front clutch assembly. Install rear clutch hub and front planetary pinion carrier in rear clutch assembly.
  7. Install connecting shell and sun gear from top of front planetary pinion carrier. Install clutch and front carrier assembly as an assembly in transmission. Ensure bearings and/or thrust washers are installed to correct position.
  8. Place transmission on work stand with extension housing downward. To check and adjust total end play, insert drum support bearing and race on rear clutch. Install a new drum support gasket in transmission. Measure and record distance "A". Measure and record distance "B" of drum support. See Fig 7 .
    Fig 7: Measuring Rear Clutch (Distance "A" & "B")
    G93F23551Courtesy of MAZDA MOTORS CORP.
  9. Subtract distance "B" from distance "A" and record total. Subtract .004" (.10 mm) from this total. This is total end play. Total end play should be .010-.020".(.25-.50 mm). If not within specifications, select different size bearing race.
  10. With total end play achieved, check and adjust front clutch end play. Install thrust washer on front clutch. Ensure drum support gasket is in place. Measure and record distances "C" and "D". See Fig 8 .
    Fig 8: Measuring Front Clutch (Distance "C" & "D")
    G93G23552Courtesy of MAZDA MOTORS CORP.
  11. Subtract distance "D" from distance "C" and record total. Subtract .0.04" (.10 mm) from this total. This is total front clutch end play. Total front clutch end play must be .020-.031" (.50-.80 mm). If not within specifications, select different size thrust washer.
  12. On Mazda RX7, install 2nd brake band and strut. Reassemble and install 2nd band servo with original spacer See Figure for location. Attach dial indicator. See Fig 9 . Apply 64-78 psi (4.5-5.5 kg/cm2 ) air pressure to oil passage. DO NOT exceed specified air pressure. Measure amount of movement. Select spacer (as necessary). See SELECTING RX7 2ND BAND SERVO SPACER  table. Check operation of 2nd brake band. See Figure .
    Fig 9: Selecting Mazda RX7 2nd Band Servo Spacer
    G00212192Courtesy of MAZDA MOTORS CORP.
  13. All other models install 2nd brake band, strut and band servo. Tighten 2nd brake servo adjusting screw lightly. Install and center drum support on OD case. See DRUM SUPPORT  under COMPONENT DISASSEMBLY & REASSEMBLY. Install gasket on transmission case. Align matching marks on OD case and transmission case and install OD case. Temporarily install 2 bolts to hold OD case in place. To check and adjust OD planetary gear total end play, position OD case upward.
    SELECTING RX7 2ND BAND SERVO SPACER

    Movement In. (mm) Selected Spacer In. (mm)
    .002-.022 (.05-.55) (1) .059 (1.50)
    .022-.041 (.56-1.05) (1) .039 (.99)
    .042-.061 (1.06-1.55) (1) .020 (.51)
    .061-.081 (1.56-2.05) Use Original Spacer
    .081-.100 (2.06-2.55) (2) .020 (.51)
    .100-.120 (2.56-3.05) (2) .039 (.99)
    .120-.140 (3.06-3.55) (2) .059 (1.50)
    (1) Add this amount to thickness of original spacer.
    (2) Subtract this amount from thickness of original spacer.
  14. Install bearing and race. Install planetary carrier, sun gear and connecting shell as an assembly. DO NOT install direct clutch at this time. Install bearing and race on connecting shell. Measure and record distances "E" and "F". See Fig 10 . On N4A-EL, install sensing rotor before measuring distance "E". See Fig 11 . Install a new oil pump gasket on OD case.
    Fig 10: Measuring Distance "E" & "F"
    G93H23553Courtesy of MAZDA MOTORS CORP.
    Fig 11: Measuring Distance "E" On N4A-EL
    G93I23554Courtesy of MAZDA MOTORS CORP.
  15. Subtract distance "F" from "E" and record difference. Subtract .004" (.10 mm) from difference. Standard OD total end play should be .010-.020" (.25-.50 mm). If not within specifications, replace bearing race installed in drum support. See Fig 10 .
  16. With OD total end play within specifications, remove components from OD case. Check and adjust direct clutch end play by installing thrust rasher in OD case. Install direct clutch, sun gear, connecting shell, bearing and race. On N4A-EL, install sensing rotor. See Fig 11 . DO NOT install planetary pinion carrier.
  17. Measure and record distance "G" and "H". See Fig 12 . Subtract distance "H" from "G" and record this difference. Subtract .004 (.10 mm) from this difference. Standard direct clutch total end play should be .020-.031" (.50-.80 mm). If not within specifications, select different size thrust washer.
    Fig 12: Measuring Distances "G" & "H"
    G93J23555Courtesy of MAZDA MOTORS CORP.
  18. Install intermediate shaft. On some Mazda models, oil hole towards the front. Mazda MPV and MX-5/Miata long splines to front. On Nissan models, See Fig 13 . Install OD brake servo assembly. Install OD brake and strut. Install bearing and race, thrust washer and OD direct clutch assembly.
    Fig 13: Installing Intermediate Shaft On Nissan
    G00212193Courtesy of MAZDA MOTORS CORP.
  19. Tighten servo piston stem to hold direct clutch in place. Remove 2 bolts holding OD case to transmission. Align matching marks and install oil pump assembly. Install input shaft. On N4A-EL install input shaft trough oil pump. Install bearing, sensing rotor and snap ring. Install oil pump and input shaft as a unit on OD housing. Ensure input shaft is installed in proper direction as noted at disassembly.
  20. Apply sealant to bolt flanges and bellhousing-to-OD case mating surface. Some models utilize "O" rings between converter housing to oil pump, install new "O" rings. Align match marks and install converter housing. Torque bolts to specifications. Loosen OD servo piston stem lock nut and make adjustments according to OD & 2ND BRAKE BAND ADJUSTMENT SPECIFICATIONS  table. Tighten lock nut.
  21. Air check components to ensure proper operation. See Fig 14 . Install valve body assembly and torque to specifications. On N4A-EL, install solenoid valve electrical connector in transmission case. Install new oil pan gasket and oil pan. Torque to specifications. Install OD band servo cover. To complete reassembly, reverse disassembly procedure. Ensure torque converter is completely seated.
    Fig 14: Air Checking Locations
    G93A23556Courtesy of MAZDA MOTORS CORP.
  22. For clutch and band operation (elements in use) for N4A-EL, see Fig 15 . For all others, see CLUTCH & BAND APPLICATION - ELEMENTS IN USE (E4N71B, L4N71B, N4A-HL & JM600)  or  22 tables.
    OD & 2ND BRAKE BAND ADJUSTMENT SPECIFICATIONS

    Application OD Stem Torque INCH Lbs. Back Off Turns 2nd Stem Torque INCH Lbs. Back Off Turns
    Mazda RX7 (1989-90) & 929/929S (1988-90) 104-130 2 109-126 2 1/2
    Mazda MPV (1988-89), MX-5/Miata (1990), Pickup (1989-90), Chrysler & Mitsubishi (1988-89) 104-130 2 109-126 3
    All Other Mazda, Nissan 61-87 2 108-132 3
    CLUTCH & BAND APPLICATION - ELEMENTS IN USE (E4N71B, L4N71B, N4A-HL & JM600)

    Lever Position Elements In Use
    Park Direct Clutch, Low-Reverse Brake
    Reverse Direct Clutch, Front Clutch, Low-Reverse Brake
    Neutral Direct Clutch
    Drive (1) Direct Clutch, Rear Clutch, One-Way Clutch
    Drive (2) Direct Clutch, Rear Clutch, Brake Band
    Direct Direct Clutch, Front Clutch, Rear Clutch
    O.D. O.D. Band, Front Clutch, Rear Clutch
    Second Direct Clutch, Rear Clutch, Brake Band
    Low (2) Direct Clutch, Rear Clutch, Brake Band
    Low (1) Direct Clutch, Rear Clutch, Low-Reverse Brake, One-Way Clutch
    CLUTCH & BAND APPLICATIONS (ELEMENTS IN USE - N4A-HL)

    Selector Lever Position Elements In Use
    "D" (Drive)
    1st Gear Direct Clutch, Forward Clutch & One-Way Clutch
    2nd Gear Direct Clutch, Brake Band & Forward Clutch
    3rd Gear Direct Clutch, High-Reverse (Front) Clutch & Forward Clutch
    Overdrive Overdrive Band, High-Reverse (Front) Clutch & Forward Clutch
    "2" (Intermediate)
    2nd Gear Direct Clutch, Brake Band & Forward Clutch
    "L" (Low)
    1st Gear Direct Clutch, Forward Clutch & Low & Reverse Brake
    2nd Gear Direct Clutch, Brake Band & Forward Clutch
    "R" (Reverse) Direct Clutch, High-Reverse (Front) Clutch & Low & Reverse Brake
    "N" Or "P" (Neutral Or Park) All Clutches & Bands Released Or Ineffective
    Fig 15: Clutch & Band Application Chart (Elements In Use - N4A-EL)
    G93J23514Courtesy of MAZDA MOTORS CORP.
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