Automatic Transmission Overhaul & Testing - 4l30-e Cadillac Catera I

APPLICATION

TRANSMISSION APPLICATIONS

IDENTIFICATION

Identification plate is located on side of transmission case. (Scheme 32) Identification plate information may be required when ordering replacement components. Transmission RPO code is ML4.

Scheme 32

DESCRIPTION & OPERATION

Automatic transmission is electronically controlled, providing 4 forward speeds and reverse. Transmission uses a gear-type oil pump to supply all hydraulic pressure needed for operation. Transmission consists of a torque converter, 4 clutch assemblies, planetary gears and brake band. (Scheme 33)

Transmission shifting and torque converter lock-up are controlled by Transmission Control Module (TCM), located behind right side kick panel. TCM receives information from various input devices and uses this information to control shift solenoids, band apply solenoid and Torque Converter Clutch (TCC) solenoid. TCM uses input signals to control force motor solenoid (also called pressure control solenoid) operation, which activates pressure regulator valve for controlling line pressure.

A torque management control system is used to reduce engagement shock caused by a change in vehicle speed during shifting. TCM contains a self-diagnostic system which stores a Diagnostic Trouble Code (DTC) if a specified failure or problem is present in transmission electronic control system. If DTC has set, transmission light (exclamation symbol) on instrument panel will light. DTC may be retrieved to determine transmission problem area. For additional information on self-diagnostic system, see AUTO TRANS DIAGNOSIS article.

Transmission is capable of 3 different shift modes. These modes are economy mode, sport mode and winter mode. Economy and sport mode may be selected by pressing sport mode switch, located on top of gear selector. Sport mode indicator light ("S" symbol) on instrument panel will light. Winter mode may be selected by pressing button mounted on center console, near gear selector. Shift modes are used to change transmission shift points for various vehicle operating conditions.

Depressing sport mode switch changes transmission operating mode between economy and sport modes. In sport mode, TCM delays part throttle upshifts for greater acceleration. TCM also signals pressure control solenoid to increase line pressure for additional torque requirements in sport mode. Higher line pressure creates firmer shifts and more holding force for clutches and band.

Economy mode provides for better fuel economy by having TCM initiate earlier part throttle upshifts. Line pressure is lower in order to provide smoother upshifts and downshifts.

In winter mode, TCM changes shift solenoid states in order to start transmission in 3rd gear. By starting off in 3rd gear, less torque is created, thereby reducing tire slippage on ice and snow. When winter mode is selected, TCM overrides all other modes. TCM only enters winter mode when gear selector is in "D" (Overdrive), vehicle speed is less than 6 MPH, transmission fluid temperature is less than 266°F (130°C), wide open throttle switch is off and throttle opening is less than 7 percent. Winter mode is canceled if winter mode button is depressed, gear selector is moved to "P" position or a lower drive range, ignition is turned off, transmission fluid temperature is more than 266°F (130°C), or wide open throttle switch is activated. When winter mode is canceled due to one of these conditions, TCM returns vehicle to economy mode, regardless of operating mode before selecting winter mode.

Transmission is equipped with shift lock system. Shift lock system prevents gear selector from being moved from "P" position unless brake pedal is depressed, ignition is on and release button on gear selector is depressed.

Scheme 33

LUBRICATION

See TRANSMISSION SERVICING - A/T article in the TRANSMISSION SERVICING section.

ON-VEHICLE SERVICE

The following components can be serviced without removing transmission from vehicle

1. Converter-To-Flexplate Bolts
2. Filler Tube
3. Servo Assembly
4. Extension Housing
5. Shift Linkage
6. Solenoids
7. Speedometer Driven Gear & Seal
8. Speed Sensor
9. Main Case Oil Pan & Filter
10. Adapter Case Oil Pan & Filter
11. Main Valve Body
12. Adapter Case Valve Body
13. Transmission Range Switch & Wiring Harness
14. Wiring Harness
15. Accumulator Assemblies

ELECTRICAL COMPONENTS

For servicing of electrical components, see AUTO TRANS DIAGNOSIS article.

BRAKE BAND ADJUSTMENT

1. Drain fluid. Remove bolts, main case oil pan and gasket. (Scheme 37) Remove bolts, servo cover and gasket. Loosen lock nut on servo adjusting screw.
2. Using an INCH-lb. torque wrench, tighten servo adjusting screw to 40 INCH lbs. (4.5 N.m). Back off servo adjusting screw 5 revolutions. Hold sleeve on servo piston. Tighten lock nut to 14 ft. lbs. (19 N.m). Ensure servo adjusting screw does not rotate while tightening lock nut.
3. Using a NEW gasket, install servo cover. Install and tighten bolts to specification. See «TORQUE SPECIFICATIONS»(/cadillac/catera/i-1996-2001/remont/automatic-trans/#automatic-transmission-overhaul-testing-4l30-e__torque-specifications). Using a NEW gasket, install main case oil pan. Install and tighten bolts to specification. Fill transmission with Dexron-III ATF.

SHIFT LINKAGE ADJUSTMENT

Place gear selector in "P" position. Raise and support vehicle. Loosen adjustment bolt at end of shift linkage rod enough to allow transmission range switch adjuster to slide freely. Push adjuster toward shift linkage rod. Ensure gear selector is still in "P" position and tighten adjustment bolt to 71 INCH lbs. (8 N.m). Lower vehicle and ensure engine starts in "P" and "N".

VALVE BODIES

See TRANSMISSION DISASSEMBLY .

OIL COOLER FLUSHING

1. If available, fill line flusher with solution and install Oil Cooler and Line Flusher (J-35944) to top transmission cooler line on transmission. Follow manufacturer's instructions to flush oil cooler and cooler lines.
2. If flusher tool is not available, flush cooler and cooler lines with a mixture of clean solvent and water. Flush cooler in both directions until all old fluid and debris are removed. If necessary, replace plugged or damaged cooler and/or lines.

ADJUSTMENTS

See TRANSMISSION SERVICING - A/T article in the TRANSMISSION SERVICING section.

TROUBLE SHOOTING

Note. For electrical trouble shooting, see procedures in the AUTO TRANS DIAGNOSIS article. Before trouble shooting transmission, perform trouble shooting preliminary procedure. See PRELIMINARY PROCEDURE . Once trouble shooting preliminary procedure is performed, proceed to symptom diagnosis. See SYMPTOM DIAGNOSIS. For elements in use at specified gear selector positions, see CLUTCH & BAND APPLICATION CHART under CLUTCH & BAND APPLICATION.

PRELIMINARY PROCEDURE

1. Before performing transmission trouble shooting, check fluid level, fluid condition and shift linkage adjustment. Check for stored DTCs. See AUTO TRANS DIAGNOSIS article. If any DTCs are present, diagnose and repair all computer-related DTCs. If no DTCs are present, go to next step.
2. Perform road test, stall speed test and hydraulic pressure test to identify problem. See ROAD TEST, STALL SPEED TEST and HYDRAULIC PRESSURE TESTS under «TESTING»(/cadillac/catera/i-1996-2001/remont/automatic-trans/#automatic-transmission-overhaul-testing-4l30-e) . For specific complaints, see appropriate condition(s) listed under SYMPTOM DIAGNOSIS.

Delayed Gear Engagement In "D" & "R" Positions

1. Defective Teflon Seal Rings On Turbine Shaft
2. Low Line Pressure

Delayed Gear Engagement In "R" Position Only

1. Defective Main Valve Body-To-Transmission Case Gasket
2. Low Line Pressure
3. Missing Check Balls In Valve Body
4. Restricted Orifice At Transfer Plate & Valve Body

Engine Flare During 1-2 Or 2-3 Shift

1. Defective Band Apply Solenoid
2. Defective Or Stuck 1-2 Accumulator Valve
3. Defective Servo Piston Or Seal Ring
4. Low Line Pressure

Engine Will Not Start With Shift Lever In "P" Or "N" Position

1. Defective Mode Switch Or Wiring Circuit
2. Defective Or Improperly Adjusted Mode Switch
3. Improper Shift Linkage Adjustment

Harsh Coasting Downshifts Or Clunk At 3-2 Shift

1. Defective Band Apply Solenoid
2. Excessive Line Pressure

Harsh Or Soft Shifts In All Gears

1. Defective Accumulator Piston Or Servo
2. Defective Band Apply Solenoid
3. Defective Clutch Plates Or Brake Band
4. Defective Or Missing Check Ball

In 2nd And 3rd Clutch Pistons

1. Defective Seal Rings
2. Excessive Clutch Piston Travel
3. Improper Line Pressure

Harsh Shift Into "D" Position Or Accelerating From A Stop

1. Defective Band Apply Solenoid
2. Excessive Line Pressure

Harsh 1-2 Shift

1. Defective Or Stuck 1-2 Accumulator Valve
2. Excessive Line Pressure

Harsh 3-4 Shift

1. Defective Or Stuck 3-4 Accumulator Piston
2. Defective Or Stuck 3-4 Accumulator Valve
3. Excessive Line Pressure

Improper 3-2 Shift

1. Defective Band Apply Solenoid
2. Low Line Pressure

Intermittent 4-2 Downshift At Steady Speed

1. Defective Mode Switch Or Wiring
2. Defective Speed Sensor Or Wiring

No Engine Braking

1. Damaged Piston Seal Ring On Overrun Clutch Piston
2. Defective Or Stuck Overrun Lock-Out Valve On Center Support
3. Defective Teflon Seal Rings On Turbine Shaft
4. Defective Turbine Shaft
5. Defective 3-4 Accumulator Piston
6. Excessive Overrun Clutch Piston Travel
7. Low Line Pressure

No Forward Or Reverse Gears

1. Defective Overdrive Roller Clutch
2. Defective Shift Linkage
3. Defective Turbine Shaft
4. Low Line Pressure

No 1st & 2nd Gears, Or No 3rd & 4th Gears

1. Defective Shift Solenoid

No 1st & 4th Gears, Or No 2nd & 3rd Gears

1. Defective Shift Solenoid

Shudder During Torque Converter Clutch (TCC) Application

1. Defective Oil Filter Or Gasket
2. Defective Torque Converter
3. Defective Turbine Shaft "O" Ring

Vehicle Will Not Move In 3rd Gear In Winter Mode

1. Defective Accumulator Piston
2. Defective Or Missing Check Ball

In 2nd Clutch Piston

1. Defective 2nd Clutch Seals
2. Excessive 2nd Clutch Piston Travel
3. Internal Hydraulic Pressure Leakage

Whine Or Buzzing Noise From Transmission

1. Defective Oil Filter Gasket
2. Low Fluid Level
3. Restricted Oil Filter

CLUTCH & BAND APPLICATION CHART

ELECTRONIC SELF-DIAGNOSTICS

Note. See AUTO TRANS DIAGNOSIS article.

ROAD TEST

Note. Shift speed charts reference throttle position angle instead of minimum or wide open throttle position. This measurement is more accurate. Shift speed charts apply when transmission is in "D" position while vehicle is driven in 4 forward gears. Solid line represents upshifts. Dash line represents downshifts. A scan tool should be used to monitor throttle position angle. Before road testing vehicle, engine and transmission must be at operating temperature. Torque converter clutch will not engage if engine coolant has not reached operating temperature.

Gear Selector Position "D" (Overdrive)

1. With gear selector in "D" (overdrive) position, steadily increase throttle pressure to accelerate vehicle. Note shift speed engagement points in 2nd gear, 3rd gear and overdrive gear. Use shift speed charts as a reference for correct shift speeds. (Scheme 34)and (Scheme 35). Also note when Torque Converter Clutch (TCC) engages while in 3rd gear or overdrive. NOTE: Ensure TCC engages in 3rd gear or overdrive during the following steps. If necessary, a scan tool may be used to indicate TCC and shift solenoid operation.
2. At vehicle speeds of 40-50 MPH, quickly depress accelerator to half open position (part throttle detent downshift). TCC should release,1-2 shift solenoid turns off, and transmission should immediately downshift to 3rd gear.
3. At vehicle speeds of 40-50 MPH, quickly depress accelerator to wide open position (full throttle detent downshift). TCC should release, shift solenoids turn off, and transmission should immediately downshift to 2nd gear.
4. At vehicle speeds of 40-55 MPH, release accelerator pedal while moving gear selector to "3" (3rd gear) position. TCC should release, transmission should downshift to 3rd gear, and engine braking should slow vehicle.
5. Move gear selector to "D" (overdrive) position, and accelerate to 40-45 MPH. Release accelerator pedal while moving gear selector to "2" (2nd gear) position. TCC should release, transmission should downshift to 2nd gear immediately, and engine braking should slow vehicle.
6. Move gear selector to "D" (overdrive) position, and accelerate to 30 MPH. Release accelerator pedal while moving gear selector to "1" (1st gear) position. TCC should release, transmission should downshift to 1st gear, and engine braking should slow vehicle.
7. With gear selector in "D" (overdrive) position, accelerate vehicle to overdrive gear with TCC applied. Release accelerator pedal, and lightly apply brakes. The TCC should release. Note speeds at which vehicle downshifts. (Scheme 34)and (Scheme 35).

Gear Selector Position "3" (3rd Gear)

With vehicle stopped, move gear selector to "3" (3rd gear) position. Steadily increase throttle pressure to accelerate vehicle. Note speeds at which vehicle shifts into 2nd and 3rd gears. (Scheme 34)and (Scheme 35). Ensure TCC engages while in 3rd gear.

Gear Selector Position "2" (2nd Gear)

With vehicle stopped, move gear selector to "2" (2nd gear) position. Accelerate vehicle, and note speed at which vehicle shifts from 1st gear to 2nd gear. Accelerate vehicle to 35 MPH. Transmission should not shift into 3rd gear, and TCC should not engage.

Gear Selector Position "1" (1st Gear)

With vehicle stopped, move gear selector to "1" (1st gear) position. Accelerate vehicle to 20 MPH. Transmission should not upshift, and TCC should not engage.

Gear Selector Position "R" (Reverse)

With vehicle stopped, move gear selector to "R" (Reverse) position. Verify shift solenoids are on.

Scheme 34

Scheme 35

HYDRAULIC PRESSURE TESTS

Note. TCM controls pressure control solenoid in order to control pressure regulator valve. During line pressure test, compare scan tool value for pressure control solenoid current draw and transmission fluid pressure at oil pressure gauge to ensure line pressure specifications are correct. Values on scan tool may deviate slightly.

Pressure Test Preparation

Warm engine to normal operating temperature. Ensure transmission fluid level is correct. Turn engine off. Apply parking brake. Connect scan tool to Data Link Connector (DLC).

Line Pressure Test

1. Raise and support vehicle. With engine off, remove oil pressure tap plug from line pressure tap, located near torque converter housing on driver's side of transmission case, just above adapter case oil pan. (Scheme 36)
2. Install oil pressure gauge and adapter on line pressure tap. Start engine and allow it to idle. Line pressure is checked in each transmission shift mode with engine idling and at stall speed with gear selector in specified position. Shift mode may be selected by depressing sport mode switch mounted on gear selector for sport mode, or by depressing winter mode switch, located to right of gear selector. When neither sport or winter mode are selected, transmission will remain in economy mode.
3. With engine idling, place gear selector in specified position and note line pressure reading. Line pressure should be within specification. See «LINE PRESSURE SPECIFICATIONS»(/cadillac/catera/i-1996-2001/remont/automatic-trans/#automatic-transmission-overhaul-testing-4l30-e) table.
4. To check line pressure at stall speed, fully depress brake pedal. Place gear selector in "D" position and in proper shift mode. Fully depress accelerator no more than 5 seconds and note line pressure reading. CAUTION: Stall speed should be more than 1500 RPM. Normal stall speed RPM is about 2200 RPM. DO NOT perform line pressure test for more than 5 seconds at stall speed or transmission damage may occur. Transmission must be cooled between pressure tests by placing gear selector in "N" position and operating engine at idle for at least one minute. Use scan tool to monitor transmission fluid temperature. Under normal conditions, transmission fluid temperature is 158-248°F (70-120°C).
5. Place gear selector in "N" position. Operate engine at idle for at least one minute to cool transmission. Repeat line pressure test procedure at stall speed with gear selector in "3", "2", "1" and "R" positions in proper shift mode.
6. Line pressure should be within specification. See «LINE PRESSURE SPECIFICATIONS»(/cadillac/catera/i-1996-2001/remont/automatic-trans/#automatic-transmission-overhaul-testing-4l30-e) table. If line pressure is not within specification, see «LINE PRESSURE TEST TROUBLE SHOOTING»(/cadillac/catera/i-1996-2001/remont/automatic-trans/#automatic-transmission-overhaul-testing-4l30-e) table. Turn engine off.
7. Remove oil pressure gauge and adapter. Apply Loctite 242 on threads of oil pressure tap plug. Install and tighten tap plug to 10 ft. lbs. (14 N.m).

Scheme 36

LINE PRESSURE SPECIFICATIONS

LINE PRESSURE TEST TROUBLE SHOOTING

STALL SPEED TEST

1. Apply parking brake. Block all wheels. Connect tachometer and start engine. Warm engine to normal operating temperature. Ensure transmission fluid level is correct.
2. Fully depress brake pedal. Place gear selector in "D" position. Fully depress accelerator for no more than 5 seconds and note highest engine speed. This is the torque converter stall speed.
3. Place gear selector in "N" position. Operate engine at idle for at least one minute to cool transmission. Repeat test procedure with gear selector in "3", "2", "1" and "R" positions.
4. Torque converter stall speed should be 1500-2200 RPM. If torque converter stall speed is not within specification, an internal torque converter or transmission failure is present. Check for faulty oil pump, pressure control solenoid, oil filter, pressure regulator oil screen, pressure limiting valve, throttle valve switch or wiring harness between components.

TORQUE CONVERTER INSPECTION

Note. For diagnosing torque converter clutch, see AUTO TRANS DIAGNOSIS article.

Torque converter must be replaced for any of the following reasons.

1. Damage To Oil Pump Assembly
2. Metal Particles Present In Oil
3. Leaks In Hub Weld Area
4. Crankshaft Pilot Broken Or Damaged
5. Hub Scored Or Damaged
6. Stator Failure
7. Torque Converter Imbalance
8. Engine Coolant Contamination
9. Excessive End Play

TORQUE CONVERTER STALL TEST

1. Torque converter whine is usually noticed when vehicle is stopped and transmission is in Reverse or Drive. Whine will increase when engine RPM is increased and will stop when vehicle is moving or when torque converter clutch is applied. This test is to ensure whine is coming from torque converter.
2. Start engine, and allow it to reach normal operating temperature. Apply parking and service brakes. Put transmission in Drive. Depress accelerator to about 1200 RPM for less than 6 seconds. DO NOT depress accelerator for more than 6 seconds or transmission damage may occur. Torque converter noise will increase under this load.

Note. Torque converter whine should not be confused with pump whine, which is usually noticeable in Park, Neutral and all other gear ranges. Pump whine will vary with pressure.

TORQUE CONVERTER STATOR CHECK

1. Torque converter stator roller clutch can either remain locked up at all times or freewheel in both directions. If stator is freewheeling at all times, vehicle tends to have poor acceleration from a stop. Vehicle may act normal at speeds above 30-35 MPH.
2. If poor acceleration is noted, ensure exhaust system is not blocked, engine timing is correct and transmission is in 1st gear when starting from a stop. If stator is locked up at all times, performance from a stop appears normal. Engine RPM and acceleration is limited at high speeds. Engine may overheat from this condition.
3. A visual inspection of torque converter may reveal converter is Blue from overheating. If torque converter has been removed from vehicle, stator roller clutch can be checked by inserting a finger into splined inner race of roller clutch and trying to turn race in both directions. Inner race should turn freely clockwise but should not turn or should be difficult to turn counterclockwise.

REMOVAL & INSTALLATION

See TRANSMISSION REMOVAL & INSTALLATION - A/T article in the TRANSMISSION SERVICING section.

Disassembly

1. Remove torque converter. Remove "O" ring from end of turbine shaft. Using spring compressor, compress 3-4 accumulator cover. Remove snap ring from adapter case. Remove spring compressor. Using slide hammer screwed into center of cover, pull cover from adapter case. Remove spring and 3-4 accumulator piston. (Scheme 37) Remove all seal rings.
2. Remove screws, cover, transmission range switch and wiring harness. (Scheme 37) Remove bolts, adapter case oil pan and gasket.
3. Disconnect electrical connectors at components on adapter case valve body. Note location of adapter case valve body bolts for reassembly reference. Remove bolts, adapter case valve body, transfer plate, transfer plate gasket and valve body gasket. Remove check ball from adapter case. (Scheme 38)
4. Remove wiring harness for solenoids on adapter case valve body. Remove bolts, main case oil pan, magnet and gasket. Remove bolts and oil filter.
5. Remove bolts and manual detent. Disconnect wiring harness at solenoids on main case valve body and case electrical connector. Remove electrical connector.
6. Remove bolts, servo cover and gasket. Position transmission case with main case valve body facing upward. Note location of main case valve body bolts for reassembly reference. Note position of manual valve link, as long end fits into manual valve and short end fits into range selector.
7. Remove bolts, main valve body with manual valve link, transfer plate gasket, main case gasket and transfer plate. Note location of 2 check balls in transmission case. (Scheme 39) Remove check balls from transmission case.
8. Using spring compressor, compress servo piston and return spring. Remove servo piston retaining ring. Slowly release spring compressor. Remove spring compressor, servo piston, apply rod and return spring. (Scheme 37)
9. Remove bolt and speed sensor with "O" ring from extension housing. Remove drive shaft flange nut, drive shaft flange and "O" ring from rear of transmission. Remove bolts, extension housing and gasket from transmission case.
10. Remove retaining ring, speed sensor drive gear and parking lock gear with seal ring from output shaft. Position transmission case in vertical position with torque converter housing facing upward.
11. If removing oil pump assembly from torque converter housing, loosen but DO NOT remove 5 inner bolts on torque converter housing. These are oil pump assembly-to-torque converter housing bolts.
12. Remove 7 torque converter housing-to-adapter case outer bolts. Remove torque converter housing, "O" ring seal, oil pump, gasket and selective thrust washer.
13. Remove 4th clutch retainer from the turbine shaft. (Scheme 40) Pull upward on turbine shaft and lift overrun clutch assembly and 4th clutch plates and clutch discs from transmission case. Remove thrust bearing, overdrive internal gear and thrust washer.
14. Remove adapter case and center support assembly with 4th clutch piston. (Scheme 37)and (Scheme 40). Remove seal ring, selective thrust washer and "O" rings from transmission case.
15. While holding intermediate shaft, twist and pull out 2nd and 3rd clutch assemblies with reverse clutch plates and clutch discs from transmission case while holding onto output shaft. (Scheme 41) Separate 2nd and 3rd clutch assemblies. Remove thrust washer, reverse clutch plates and pressure plate.
16. Remove bearing, washer, planetary carrier and thrust bearing assembly from transmission case. (Scheme 41) Remove reaction sun gear, needle bearing, brake drum, brake band and thrust bearing assembly.
17. For reassembly reference, measure height of spring pin in relation to transmission case. Spring pin retains selector shaft in transmission case. (Scheme 42)
18. Insert wire into center of spring pin to prevent spring pin from collapsing during removal. Protect machined surface of transmission case. Remove spring pin.
19. Remove selector shaft nut from end of selector shaft. Remove parking lock and range selector lever with actuator rod from selector shaft. Remove selector shaft. (Scheme 42) Remove main case breather and seal. (Scheme 37)

Cleaning & Inspection

1. Clean components with solvent and dry with compressed air. Inspect all gears and shafts for chipped gears, excessive wear and damage. Replace components as necessary.
2. Using feeler gauge, measure planetary carrier pinion end clearance. (Scheme 43) Planetary carrier pinion end clearance should be.005-.035" (.13-.89 mm). Replace planetary carrier if pinion end clearance is not within specification.

Scheme 37

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

1. Remove oil pump assembly-to-torque converter housing bolts from center of torque converter housing. Remove torque converter housing, outer seal ring and wear plate from oil pump assembly. (Scheme 44)
2. Remove bolts and oil seal ring from center of torque converter housing. Using feeler gauge and straightedge, measure oil pump gear clearance. (Scheme 45) Clearance should be.0005-.0033" (.013-.084 mm). Replace components as necessary. If disassembling oil pump assembly, place reference marks on drive and driven gears for reassembly reference to ensure gears are installed in original direction.
3. Remove components from oil pump assembly. (Scheme 44) Use care when removing pins and snap rings, as they are under spring pressure.

Clean components with solvent and dry with compressed air. Inspect for damage and excessive wear. Replace components as necessary.

Note. DO NOT remove TCC control valve, pressure regulator valve or reverse boost valve unless line pressure test determines these components are malfunctioning.

Reassembly

1. Lubricate all components with Dexron-III ATF. To reassemble oil pump assembly, reverse disassembly procedure. Ensure spring seat is installed on pressure regulator valve with flat side of spring seat against shoulder on pressure regulator valve. Ensure spring seat is installed on throttle signal accumulator piston spring with flat side of spring seat away from spring. Ensure drive and driven gears are installed in original direction.
2. To reassemble torque converter housing, install NEW oil seal ring on torque converter housing. Install and tighten bolts to specification. See «TORQUE SPECIFICATIONS»(/cadillac/catera/i-1996-2001/remont/automatic-trans/#automatic-transmission-overhaul-testing-4l30-e__torque-specifications). Install wear plate on oil pump assembly. Install NEW gasket and NEW outer seal ring. Install torque converter housing on oil pump assembly.
3. Install Guide Pins (J-38588) in torque converter housing and oil pump assembly. (Scheme 46) Loosely install oil pump assembly-to-torque converter housing bolts.
4. Using Oil Pump Centering Adapter (J-38557), center oil pump assembly on torque converter housing. Tighten oil pump assembly-to-torque converter housing bolts to specification in a crisscross pattern. Remove oil pump centering adapter and guide pins.

Scheme 44

Scheme 45

Scheme 46

MAIN VALVE BODY

Remove transfer plate-to-main valve body bolts. Remove transfer plate gasket/transfer plate from main valve body. (Scheme 37) Note location of check ball in main valve body. (Scheme 47) Remove components from main valve body. Use care when removing pins and plugs, as components are under spring tension.

Clean components with solvent and dry with compressed air. Inspect components for damage or signs of wear. Replace components as required. Ensure valves slide freely in bores on main valve body.

Note. The use of a honing stone, fine sandpaper or crocus cloth is not recommended for servicing stuck valves. If it is necessary to clean valves, use micro fine lapping compound 900 grit or finer. Valve lands have sharply machined corners that are used to clean bores.

1. Lubricate all components with Dexron-III ATF. To reassemble, reverse disassembly procedure using NEW transfer plate gaskets. Make sure components are installed in correct location. (Scheme 47)
2. Use guide pins in main valve body when installing transfer plate gaskets and transfer plate on main valve body. Install and tighten transfer plate-to-main valve body bolts to specification. See «TORQUE SPECIFICATIONS»(/cadillac/catera/i-1996-2001/remont/automatic-trans/#automatic-transmission-overhaul-testing-4l30-e__torque-specifications).

Note. A delayed forward engagement condition may be caused by a clogged band apply solenoid. Solenoid screen assembly may break apart, clogging solenoid. If screen assembly is broken, replace both screen assembly and solenoid.

Scheme 47

ADAPTER CASE VALVE BODY

Remove components from adapter case valve body. (Scheme 48) Use care when removing spring pins and plugs, as components are under spring tension. When removing plug for screen assembly, screw a 5-mm bolt in center of plug to aid in plug removal.

Clean components with solvent and dry with compressed air. Inspect components for damage or signs of wear. Replace components as required. Ensure valves slide freely in bores on adapter case valve body.

Lubricate all components with Dexron-III ATF. To reassemble, reverse disassembly procedure using NEW "O" rings. Ensure force motor solenoid is positioned with electrical connections on solenoid facing toward mounting surface on adapter case valve body. Tighten force motor solenoid and torque converter clutch solenoid retaining bolts to specification. See TORQUE SPECIFICATIONS .

Scheme 48

1. Place 3rd clutch drum and intermediate shaft upright, using overdrive internal gear as a support. (Scheme 49) Locate end of retaining ring at opening on side of 3rd clutch drum. Using screwdriver, compress one end of retaining ring and install one Retaining Ring Compressor (J-38450) near end of retaining ring to hold retaining ring clear of groove in 3rd clutch drum. (Scheme 49)
2. Compress other end of retaining ring and install retaining ring compressor near end of retaining ring. Repeat procedure by installing 3 remaining retaining ring compressors at equal intervals between retaining ring and 3rd clutch drum. Ensure retaining ring is fully disengaged from 3rd clutch drum.
3. Pull upward on input sun gear assembly until retaining ring clears groove in 3rd clutch drum. Remove retaining ring compressors. Remove input sun gear assembly from 3rd clutch drum.
4. Remove retaining washer, thrust bearing and thrust washer from 3rd clutch drum. Remove clutch plates, clutch discs and spring cushion plate from 3rd clutch drum. Note number and direction of clutch plates, clutch discs and spring cushion plate installation for reassembly reference. (Scheme 41)
5. To remove clutch piston from 3rd clutch drum, using spring compressor, compress return springs and return spring seat. DO NOT over compress return springs and return spring seat.
6. Remove retaining ring from center of 3rd clutch drum. Release spring compressor. DO NOT allow return spring seat to bind in groove for retaining ring.
7. Remove spring compressor, return spring seat and return springs. Remove clutch piston from 3rd clutch drum. Remove seal rings from clutch piston.
8. To remove sprag assembly from input sun gear, remove sprag assembly outer race. (Scheme 41) Note direction of sprag assembly installation on input sun gear for reassembly reference. Remove sprag assembly from input sun gear.

Scheme 49

Clean metal components with solvent and dry with compressed air. Inspect components for damage or signs of wear. Replace components as required. Ensure check ball is located in clutch piston. Shake clutch piston to ensure check ball moves freely in clutch piston.

Scheme 50

1. Lubricate all components with Dexron-III ATF. Place input sun gear on flat surface with sun gear facing upward. CAUTION: Sprag assembly must be installed on input sun gear so flared shoulder on sprag assembly is toward input sun gear.
2. Install sprag assembly outer race on sprag assembly. Install sprag assembly with outer race on input sun gear with flared shoulder on sprag assembly toward input sun gear. Push downward on sprag assembly while rotating input sun gear counterclockwise until sprag assembly seats on input sun gear.
3. To check sprag assembly operation, hold input sun gear. Rotate sprag assembly outer race. Sprag assembly outer race should rotate freely counterclockwise and lock when rotated clockwise. (Scheme 50) If sprag assembly operation is not as specified, sprag assembly is incorrectly installed on input sun gear.
4. Install NEW seal rings on clutch piston so lip on seal ring faces toward shaft end of 3rd clutch drum (toward front of transmission). Lubricate seal rings with Dexron-III ATF.
5. Install clutch piston in 3rd clutch drum. Use care not to damage seal rings. Install return springs and return spring seat.
6. Using spring compressor, compress return springs and return spring seat. Use care to not allow return spring seat to bind in groove for retaining ring or overcompress return springs and return spring seat.
7. Install retaining ring at center of 3rd clutch drum. Remove spring compressor. Place 3rd clutch drum and intermediate shaft upright, using overdrive internal gear as a support. CAUTION: Spring cushion plate MUST be installed in 3rd clutch drum so beveled side of spring cushion plate is toward 3rd clutch drum. (Scheme 41)
8. Install spring cushion plate in 3rd clutch drum with beveled side of spring cushion plate toward the 3rd clutch drum. (Scheme 41) Install clutch plates and clutch discs in 3rd clutch drum, starting with clutch plate and alternating with clutch disc.
9. Install thrust washer, thrust bearing and retaining washer on 3rd clutch drum. Install input sun gear assembly on 3rd clutch assembly. Ensure splines on sprag assembly fully engages with tangs on clutch discs. Rotate input sun gear assembly back and forth to ensure sprag assembly outer race engages with 3rd clutch drum.
10. Install retaining ring compressors at each side of retaining ring. Using screwdriver, compress retaining ring while pushing downward on sprag assembly outer race until retaining ring aligns with groove on 3rd clutch drum. Remove retaining ring compressors. Ensure retaining ring fully engages in groove in 3rd clutch drum.

1. Remove retaining ring, ring gear, retaining ring and spacer from 2nd clutch drum. (Scheme 41) Remove clutch plates, clutch discs and waved plate from 2nd clutch drum. Note number and direction of clutch plates, clutch discs and waved plate installation for reassembly reference.
2. To remove clutch piston from 2nd clutch drum, using spring compressor, compress return springs and return spring seat. Remove retaining ring from center of 2nd clutch drum.
3. Release spring compressor. DO NOT allow return spring seat to bind in groove for retaining ring. Remove spring compressor, return spring seat and return springs. Remove clutch piston from 2nd clutch drum. Remove seal rings from clutch piston.

Clean metal components with solvent and dry with compressed air. Inspect components for damage or signs of wear. Replace components as required. Ensure check ball is located in clutch piston. Shake clutch piston to ensure check ball moves freely in clutch piston.

1. Lubricate all components with Dexron-III ATF. Install NEW seal rings on clutch piston so lip on seal ring faces toward inside of 2nd clutch drum (toward front of transmission). Install clutch piston in 2nd clutch drum. Use care not to damage seal rings. Install return springs and return spring seat.
2. Using spring compressor, compress return springs and return spring seat. Use care to not allow return spring seat to bind in groove for retaining ring.
3. Install retaining ring at center of 2nd clutch drum. Remove spring compressor. Install waved plate in 2nd clutch drum. Ensure waved plate is installed in original direction.
4. Install clutch plates and clutch discs in 2nd clutch drum, starting with clutch plate, alternating with clutch disc. (Scheme 41) Install spacer with waved end facing clutch plates. (Scheme 41) Install retaining ring, ring gear and remaining retaining ring. Ensure ring gear is installed with grooved edge facing up.

1. The 3-4 accumulator is located in the adapter case. (Scheme 51) Using spring compressor, depress cover. Remove snap ring from adapter case. Remove spring compressor.
2. Using slide hammer screwed into center of cover, pull cover from adapter case. Remove spring and 3-4 accumulator piston. Remove all seal rings.

Clean metal components with solvent and dry with compressed air. Inspect components for damage or signs of wear. Replace components as required.

To reassemble, reverse disassembly procedure using NEW seal rings. Lubricate seal rings with Dexron-III ATF.

Scheme 51

1. Using Spring Compressor (J-23327), compress return springs and return spring seat on center support. (Scheme 52) DO NOT over compress return springs and return spring seat or damage to return spring seat may result.
2. Remove retaining ring. Remove spring compressor, return spring seat and return springs. Remove the reverse clutch piston. (Scheme 41) Remove bolts, center support, gasket, transfer plate and gasket from adapter case. (Scheme 37) Remove restrictor from adapter case. (Scheme 53)
3. Remove retainer plate from side of center support. (Scheme 54) Remove plug, overrun and reverse lock-out valve springs and overrun and reverse lock-out valves from center support (if equipped).

Clean components with solvent and dry with compressed air. Inspect components for damage or signs of wear. Replace components as required.

1. Lubricate all metal components with Dexron-III ATF. Install overrun and reverse lock-out valves (if equipped) in center support so small diameter end is toward overrun and reverse lock-out valve spring area in center support. (Scheme 54) Install overrun and reverse lock-out valve springs.
2. Install plug and retainer plate on center support. Install restrictor in rear of adapter case. (Scheme 53) Using NEW gaskets, install transfer plate and center support on adapter case. Install and tighten center support bolts to specification. See «TORQUE SPECIFICATIONS»(/cadillac/catera/i-1996-2001/remont/automatic-trans/#automatic-transmission-overhaul-testing-4l30-e__torque-specifications).
3. Install reverse clutch piston on center support. Install return springs and return spring seat. Using spring compressor, compress return springs and return spring seat. Install retaining ring. Remove spring compressor.

Scheme 52

Scheme 53

Scheme 54

1. Position overrun clutch assembly upright, using overdrive internal gear as a support. Remove snap ring and overdrive carrier assembly. (Scheme 40)
2. Remove overdrive sun gear and turbine shaft. Remove snap ring, backing plate, clutch discs, clutch plates and waved plate (if equipped). Note number and direction of clutch discs and clutch plate installation for reassembly reference.
3. Using spring compressor, compress release spring retainer and release spring. Remove snap ring from center of overrun clutch drum. Remove spring compressor.
4. Remove roller clutch cam, roller clutch, release spring retainer and release spring. Remove clutch piston from overrun clutch drum. Remove seals from clutch piston if seals are not molded onto clutch piston. Remove turbine shaft oil seal rings from turbine shaft.

1. Clean metal components with solvent and dry with compressed air. Inspect components for damage or signs of wear. Replace components as required.
2. Using feeler gauge, measure overdrive carrier assembly pinion end clearance. (Scheme 55) Overdrive carrier assembly pinion end clearance should be.009-.025" (.23-.64 mm). Replace overdrive carrier assembly carrier if pinion end clearance is not within specification.

1. Lubricate all metal components with Dexron-III ATF. Apply petroleum jelly on turbine shaft oil seal rings. Install turbine shaft oil seal rings on turbine shaft.
2. Install NEW seals on clutch piston if seals are not molded onto clutch piston. Install clutch piston in overrun clutch drum. Use care not to damage seal rings. CAUTION: Release spring MUST be installed in proper direction in overrun clutch drum. (Scheme 40)
3. Install release spring in overrun clutch drum. Ensure release spring is installed in proper direction on overrun clutch drum. (Scheme 40)
4. Install release spring retainer, roller clutch and roller clutch cam in overrun clutch drum. Using spring compressor, compress release spring retainer and release spring. Install snap ring at center of overrun clutch drum. Remove spring compressor.
5. Install waved plate (if equipped). Install clutch plates and clutch discs in overrun clutch drum, starting with 2 clutch plates and alternating with clutch disc. (Scheme 40) CAUTION: Sun gear must be installed with countersunk area on sun gear facing toward overrun clutch drum.
6. Install backing plate and snap ring. Install turbine shaft on overrun clutch drum. Install sun gear with countersunk area on sun gear facing toward overrun clutch drum.
7. Install overdrive carrier assembly. Rotate overdrive carrier assembly counterclockwise during installation until roller clutch fully engages overdrive carrier assembly. Rotate overdrive carrier assembly and listen for looseness in rollers on roller clutch. Install snap ring on end of turbine shaft.

Scheme 55

TRANSMISSION REASSEMBLY

Note. Lubricate all components with Dexron-III ATF before reassembly. Coat all thrust bearings assemblies with petroleum jelly before installing. For bearing, bushing, oil seal and thrust washer location reference during reassembly (Scheme 61)-32.

Scheme 56

Scheme 57

Scheme 58

Scheme 59

1. Install NEW shaft seal for selector shaft in transmission case. Install selector shaft. Install spring pin in transmission case. (Scheme 42) DO NOT install spring pin flush with surface on transmission case.
2. Install parking lock and range selector lever with actuator rod on selector shaft. Install and tighten selector shaft nut to specification. See «TORQUE SPECIFICATIONS»(/cadillac/catera/i-1996-2001/remont/automatic-trans/#automatic-transmission-overhaul-testing-4l30-e__torque-specifications).
3. Install brake band in transmission case. Ensure servo pin area aligns with servo hole. Install thrust bearing assembly in rear of transmission case.
4. Install brake drum, reaction sun gear and needle bearing. (Scheme 41) Install thrust bearing assembly on output shaft on planetary carrier.
5. Pinions on planetary carrier must be properly aligned. Each pinion is marked with 2 dots to indicate master tooth space and a single dot to indicate master tooth. Planetary carrier is marked with double lines which should align with 2 dots on 2 opposite pinions. Single lines on planetary carrier should align with single dot on other 2 pinions. (Scheme 56)
6. Properly align all pinion on planetary carrier. Install 2nd and 3rd clutch assemblies on planetary carrier. If pinions are properly aligned, 2nd and 3rd clutch assembly should fit easily on planetary carrier.
7. Rotate 3rd clutch and ensure pinions with 2 dots are at tooth No. 1 and 46 on ring gear in 2nd clutch assembly. (Scheme 56) Pinions with one dot should be between tooth No. 23 and 24 on ring gear in 2nd clutch assembly. If not as specified, realign as necessary.
8. Once correct pinion alignment is obtained, install planetary carrier in transmission case. Install washer and bearing on planetary carrier. (Scheme 41)
9. Install thrust washer on 2nd clutch. Ensure tangs on thrust washer engage with slots on 2nd clutch. Align tangs on clutch plates in 2nd clutch. Install 3rd clutch assembly in 2nd clutch drum.
10. Install assembled 2nd and 3rd clutch assemblies in transmission case. Ensure planetary carrier is properly aligned. Rotate output shaft and clutch assemblies to ensure proper engagement.
11. Install pressure plate in transmission case with flat side up. Lug on pressure plate must engage narrow notch in case that faces oil pan mounting surface. (Scheme 41)
12. Install reverse clutch plates and clutch discs, starting with clutch plate and alternating with clutch disc. Install waved plate with lugs engaged with narrow notch in transmission case.
13. The 2nd clutch end play must now be checked. Install Selective Thrust Washer Gauge (J-23085-A) on transmission case, against intermediate shaft. Move inner shaft on selective thrust washer gauge downward against thrust surface on 2nd clutch hub. Perform STEP 1. (Scheme 57) Tighten thumb screw on selective thrust washer gauge.
14. Remove selective thrust washer gauge from transmission case. Install spacer ring on inner shaft of selective thrust washer gauge. Measure distance "G" from end of inner shaft to surface on spacer ring. Perform STEP 2. (Scheme 57)
15. Using dimension "G", determine color code of selective thrust washer that fits on center support. See «SELECTIVE THRUST WASHER SPECIFICATIONS»(/cadillac/catera/i-1996-2001/remont/automatic-trans/#automatic-transmission-overhaul-testing-4l30-e) table. This should provide a final 2nd clutch end play of.014-.031" (.36-.79 mm).
16. Install NEW seals on 4th clutch piston. Lubricate seals with Dexron-III ATF. Install 4th clutch piston in adapter case. Use care not to damage seal rings.
17. Install 4th clutch retainer and spring assembly on 4th clutch piston. (Scheme 41) Using spring compressor, compress 4th clutch spring retainer and spring assembly. Install snap ring in adapter case. Remove spring compressor.
18. Apply petroleum jelly on selective thrust washer. Install selective thrust washer on center support. Install NEW "O" rings on front of transmission case and a NEW seal ring on the adapter case. (Scheme 37)
19. Install guide pins in front of transmission case for aligning adapter case. Install adapter case and center support assembly on transmission case.
20. Install thrust washer on adapter case. Ensure tangs on thrust washer engage with slots in adapter case. Apply petroleum jelly on thrust bearing and install at center of overdrive internal gear with Black side of thrust bearing facing upward. (Scheme 40)
21. Install overdrive internal gear with thrust bearing on turbine shaft and overrun clutch assembly. Install turbine shaft and overrun clutch assembly with overdrive internal gear in adapter case.
22. Install 4th clutch plates and clutch discs in following order: clutch plate, clutch disc, clutch plate, clutch plate, clutch disc and clutch plate. Clutch plates must be installed with short tang facing toward adapter case valve body surface.
23. Install 4th clutch retainer with notch area toward adapter case valve body surface. Overdrive clutch end play must now be checked.
24. Install Selective Thrust Washer Gauge (J-23085-A) on adapter case, against turbine shaft. Move inner shaft on selective thrust washer gauge downward against thrust surface on overrun clutch housing. Perform STEP 1. (Scheme 58) Tighten thumb screw on selective thrust washer gauge.
25. Remove selective thrust washer gauge from adapter case. Measure distance "G" from end of inner shaft to surface on selective thrust washer gauge. Perform STEP 2. (Scheme 58)
26. Using dimension "G", determine color code of selective thrust washer that fits on rear of oil pump assembly. See «SELECTIVE THRUST WASHER SPECIFICATIONS»(/cadillac/catera/i-1996-2001/remont/automatic-trans/#automatic-transmission-overhaul-testing-4l30-e) table. This should provide a final overdrive clutch end play of.004-.031" (.10-.79 mm).
27. Install NEW outer seal ring on torque converter housing and NEW gasket on oil pump assembly. (Scheme 44) Apply petroleum jelly on selective thrust washer and install on rear of oil pump assembly. Ensure selective thrust washer is fully seated on oil pump assembly.
28. Install torque converter housing with oil pump assembly and gasket on adapter case. Install and tighten torque converter housing-to-adapter case bolts to specification. See «TORQUE SPECIFICATIONS»(/cadillac/catera/i-1996-2001/remont/automatic-trans/#automatic-transmission-overhaul-testing-4l30-e__torque-specifications). Ensure oil pump gears rotate freely.
29. Install dial indicator, Turbine Shaft Puller (J-25022) and End Play Fixture (J-24773-1) onto turbine shaft. (Scheme 59) Pull turbine shaft upward until slight resistance is felt. Zero dial indicator.
30. Continue to pull turbine shaft upward and note turbine shaft end play. Turbine shaft end play should be.004-.031" (.10-.79 mm). Remove dial indicator, turbine shaft puller and end play fixture.
31. If turbine shaft end play is not within specification, different thickness selective thrust washer must be installed on rear of oil pump assembly. Repeat steps 24) through 26) for selective thrust washer selection procedure.
32. Install NEW bearing in extension housing if replacement is required. Install NEW oil seal in extension housing. Install NEW seal ring on parking lock gear if seal ring is damaged. (Scheme 41)
33. Install parking lock gear, speed sensor drive gear and retaining ring on output shaft. (Scheme 41) Using NEW gasket, install extension housing. Ensure parking pawl shaft and actuator rod are aligned with extension housing. Install and tighten extension housing bolts to specification.
34. Install drive shaft flange and NEW "O" ring on output shaft. Install and tighten drive shaft flange nut to specification.
35. Using a NEW "O" ring, install speed sensor. Install and tighten bolt to specification. Position transmission with output shaft facing upward. Install dial indicator on extension housing with stem of dial indicator against output shaft. (Scheme 60) Zero dial indicator.
36. Manually push output shaft upward and note output shaft end play. Output shaft end play should be.014-.031" (.36-.79 mm). If output shaft end play is not within specification, different thickness selective thrust washer must be installed on center support. Repeat steps 13) through 15) for selective thrust washer selection procedure.
37. Ensure brake band is correctly positioned. Rotate output shaft if necessary. Install NEW seal ring on servo piston if necessary. Install apply rod in transmission case with rounded end of rod toward the brake band.
38. Install return spring and servo piston. Use care not to damage seal ring on servo piston. Using spring compressor, compress servo piston and return spring. Install servo piston retaining snap ring. Remove spring compressor.
39. To adjust brake band, loosen lock nut on servo adjusting screw. (Scheme 37) Using an INCH-lb. torque wrench, tighten servo adjusting screw to 40 INCH lbs. (4.5 N.m).
40. Back off servo adjusting screw 5 revolutions. Hold sleeve on servo piston. Tighten lock nut to 14 ft. lbs. (19 N.m). Ensure servo adjusting screw does not rotate while tightening lock nut.
41. Install 2 check balls in transmission case. (Scheme 39) Install case electrical connector and wiring harness. Install guide pins for main valve body in transmission case.
42. Install assembled main valve body and manual valve link assembly. Manual valve link must be extended, as long end fits into manual valve and short end fits into range selector. Remove guide pins. Install and tighten main valve body bolts in a spiral pattern to specification. Install electrical connectors at solenoids on main valve body.
43. Using a NEW gasket, install servo cover. Install and tighten bolts to specification. Install manual detent on main valve body. (Scheme 37) Install and tighten bolts to specification.
44. Install a NEW oil filter. Install and tighten bolts to specification. Using NEW gasket, install main case oil pan. Install and tighten bolts to specification.
45. Install electrical connector in adapter case. Install adapter case check ball. (Scheme 38) Using NEW transfer plate gaskets, install adapter case valve body and transfer plate. Install and tighten bolts to specification. Install electrical connectors at solenoids on adapter case valve body.
46. Using a NEW gasket, install adapter case oil pan. Install and tighten bolts to specification. Using a NEW seal ring, install oil filler tube. Install and tighten bolt to specification.
47. Install and adjust transmission range switch. For range switch adjustment, see AUTO TRANS DIAGNOSIS article. Install NEW "O" ring on end of turbine shaft. Install torque converter.

SELECTIVE THRUST WASHER SPECIFICATIONS

Scheme 60

Scheme 61

Scheme 62

Scheme 63

TRANSMISSION SPECIFICATIONS

TRANSMISSION SPECIFICATIONS

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

Transmission Electronic Controls Wiring Diagram (1 Of 2). Scheme 64

Transmission Electronic Controls Wiring Diagram (2 Of 2). Scheme 65

See also:
• TORQUE SPECIFICATIONS
• TRANSMISSION DISASSEMBLY
• PRELIMINARY PROCEDURE
• TRANSMISSION REASSEMBLY