Complete disassembly, inspection, rebuild and reinstallation of the U660E 6-speed automatic transmission for the 2012-2017 Toyota Camry 2.5L I4, including replacement of wear components, seals, and clutch packs.

Warnings

Tools required

Parts

• U660E transmission rebuild kit (includes gaskets, seals, O-rings) × 1 — Use OEM specification
• Clutch pack set (C1, C2, C3, C4, B1, B2) × 1 — Use OEM specification
• Torque converter (inspect first, replace if damaged) × 1 — Use OEM specification
• Transmission filter × 1 — 35330-06010
• Transmission pan gasket × 1 — 35168-06010
• Valve body gasket set × 1 — Use OEM specification
• Solenoid set (if replacement required) × 1 — Use OEM specification
• Front pump seal × 1 — 90311-35058
• Output shaft seal × 1 — 90311-T0003
• Drain plug crush washer × 1 — 90430-12031
• Axle seals (both sides) × 2 — Use OEM specification

Fluids

• Toyota WS ATF — 10 qt

Preparation

1. Park vehicle on level ground and engage parking brake
2. Disconnect negative battery terminal and wait 90 seconds for airbag system discharge
3. Raise vehicle on lift or support securely on jack stands at all four corners
4. Remove front wheels and engine under covers
5. Drain transmission fluid completely via drain plug and pan removal
6. Prepare clean, organized workspace with parts trays labeled for each assembly group
7. Review factory service manual or rebuild manual for U660E transmission specifications
8. Install engine support fixture to hold engine weight during transmission removal
9. Remove air intake assembly and battery tray for access

Procedure

1. 1

   Remove transmission from vehicle
   Disconnect shift cable, wiring harnesses, cooler lines, and all electrical connectors from transmission. Remove starter motor. Disconnect both front axle shafts from transmission. Support transmission with transmission jack. Remove engine-to-transmission mounting bolts and carefully separate transmission from engine, ensuring torque converter remains with transmission. Lower transmission from vehicle.
2. 2

   External inspection and torque converter removal
   Mount transmission on workbench with front facing up. Remove torque converter and inspect for cracks, worn splines, or clutch material damage. Check converter endplay (should be 0.010-0.020 inch). Inspect flex plate contact area for scoring. Set aside for replacement decision after internal inspection reveals clutch material condition.
3. 3

   Remove transmission pan and valve body
   With transmission positioned vertically, remove pan bolts in criss-cross pattern. Remove pan and gasket. Remove transmission filter. Disconnect all solenoid harness connectors. Remove valve body mounting bolts carefully, noting different bolt lengths and locations. Lower valve body assembly carefully while guiding manual valve out of detent. Place valve body in clean solvent tank for later disassembly.
   Torque spec

   Pan Bolts16 Nm (12 lb-ft)
4. 4

   Disassemble front pump and input shaft assembly
   Remove front pump bolts and carefully extract pump assembly using slide hammers or pry points. Remove front pump seal. Measure front pump clearances with feeler gauge (body-to-gear clearance should be 0.0016-0.0059 inch, gear side clearance 0.0008-0.0028 inch). Remove thrust washers and note their positions and thickness. Pull input shaft and C1/C2 clutch drum assembly. Measure input shaft endplay before disassembly.
5. 5

   Remove and disassemble clutch pack assemblies
   Remove C3 clutch pack assembly from case. Remove snap rings retaining C4 clutch pack and extract assembly. Remove B1 and B2 brake assemblies. For each clutch pack: compress return springs using press, remove snap ring, extract pressure plate, clutch discs, and separator plates. Keep all components organized by assembly. Measure clutch pack clearances and disc thickness to determine wear.
6. 6

   Disassemble planetary gear sets and internal components
   Remove center support bolt and extract center support assembly. Remove planetary gear sets (front and rear) as complete assembly. Inspect all gear teeth for damage, scoring, or excessive wear. Check all thrust bearings and races for wear patterns. Remove one-way clutches and verify operation (should lock in one direction only). Measure all endplay specifications per service manual.
7. 7

   Remove output shaft and park pawl mechanism
   Extract output shaft assembly with bearing. Remove park pawl rod, spring, and pawl. Inspect park gear teeth for wear or damage. Remove governor assembly if equipped. Check all bushings in case for wear (maximum 0.004 inch clearance). Remove all remaining seals and O-rings from case.
8. 8

   Clean and inspect all components
   Thoroughly clean transmission case, all hard parts, and components in solvent. Dry completely with compressed air (blow out all passages). Inspect case for cracks, porosity, or damaged threads. Check all bushings with telescoping gauge. Inspect all gear teeth under magnification for cracks. Air test all clutch pistons (apply 14-57 psi and verify no leaks). Replace any questionable components. Verify all snap ring grooves are undamaged.
9. 9

   Rebuild valve body assembly
   Disassemble valve body on clean workspace. Remove all valve body bolts and separate sections. Extract all valves, springs, and check balls (note exact positions). Clean all valves and bores with lint-free cloth and solvent. Inspect valves for scoring or wear. Replace all seals and O-rings from rebuild kit. Test fit valves in bores (should slide freely under their own weight). Reassemble valve body with new gaskets, torquing separator plate bolts to specification. Test all solenoids with multimeter (resistance typically 11-15 ohms).
10. 10

    Reassemble clutch packs with new friction discs
    Soak new friction discs in Toyota WS ATF for 30 minutes minimum. Install new seals on all clutch pistons using seal installation tools. Assemble each clutch pack: install piston with return springs, install snap ring, then install clutch pack starting with waved plate or cushion plate per specifications. Alternate friction discs and separator plates per rebuild manual. Install pressure plate and selective snap ring. Measure clutch pack clearance with feeler gauge (typically 0.024-0.055 inch depending on pack). Adjust with selective snap rings if needed. Air test each clutch assembly at 14-57 psi to verify piston operation and seal integrity.
11. 11

    Reassemble internal components into case
    Install new output shaft seal in case using seal driver. Install output shaft assembly with new bearing if needed. Install park pawl mechanism with new spring. Install rear planetary gear set with correct thrust washers (coat with assembly lube). Install center support with new seals and O-rings. Install front planetary assembly. Install B1 and B2 brake assemblies with correct snap rings. Verify one-way clutch operation. Install C4 clutch assembly followed by C3 assembly. Check all endplay specifications with dial indicator mounted on case.
12. 12

    Install input shaft and front pump assembly
    Install C1/C2 clutch drum assembly onto input shaft with new seals. Insert complete assembly into case, aligning splines carefully. Install correct selective thrust washer on front of assembly. Install new front pump seal using seal installation tool. Apply thin coat of ATF to pump seal lip. Install front pump assembly, ensuring pump gears engage with crescent correctly. Install and torque front pump bolts in star pattern. Verify input shaft rotates freely and has correct endplay (0.012-0.035 inch typical).
13. 13

    Install valve body and transmission pan
    Position transmission with pan surface facing up. Install new filter. Clean pan rail surface thoroughly. Position valve body assembly carefully, guiding manual valve into detent lever. Install valve body bolts finger tight, then torque in sequence from center outward. Reconnect all solenoid harness connectors. Apply thin bead of RTV sealant to pan (if not using gasket), or install new pan gasket. Install pan and torque bolts in criss-cross pattern.
    Torque spec

    Pan Bolts16 Nm (12 lb-ft)
14. 14

    Final assembly and transmission installation preparation
    Install new drain plug with new crush washer. Install torque converter (new or inspected/approved original), ensuring it fully seats on all three engagement points (should click three times as you push and rotate). Verify converter is fully seated by measuring from bell housing face to converter lugs (should be minimum 0.75 inch recessed). Apply small amount of grease to converter hub seal contact area. Install new axle seals in differential area using seal driver.
    Torque spec

    Transmission Drain Plug30 Nm (22 lb-ft)
15. 15

    Install transmission into vehicle
    With transmission on jack, carefully raise into position. Ensure torque converter remains fully seated during installation. Align transmission with engine, ensuring converter hub engages pump fully. Install engine-to-transmission mounting bolts and torque larger bolts to 61 Nm (45 lb-ft) and smaller mounting bolts to 27 Nm (20 lb-ft). Install torque converter to flex plate bolts, torquing in star pattern to 95 Nm (70 lb-ft) - these are often TTY bolts, use new bolts. Reconnect axle shafts, shift cable, all wiring harnesses, cooler lines, and starter motor. Remove engine support fixture.
    Torque spec

    Mounting Bolts61 Nm (45 lb-ft)

    Flywheel Bolts95 Nm (70 lb-ft)

Reassembly

1. Install air intake assembly and battery tray
2. Reinstall front wheels and torque lug nuts to specification
3. Reinstall all under covers and splash shields
4. Reconnect negative battery terminal
5. Lower vehicle to ground

Verification

• Fill transmission with 4 quarts Toyota WS ATF initially through dipstick tube
• Start engine and verify no leaks from pan, cooler lines, or axle seals
• With engine at idle and parking brake applied, shift through all gear ranges, pausing 3 seconds in each position
• Check ATF level with engine at operating temperature, in Park on level ground - add fluid to bring to proper level (typically 6-10 quarts total)
• Perform road test: verify smooth shifts in all gears, no slipping, no harsh engagement, proper shift points
• Recheck fluid level after road test and top off if needed
• Connect scan tool and verify no transmission DTCs are present
• Monitor transmission temperature during test drive (should stabilize at 170-200°F)
• Verify no leaks after test drive - inspect all connections, pan, seals
• Reset transmission adaptation values using scan tool per manufacturer procedure

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