Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSA/T - TWENTY STEPS TO SUCCESSFUL REPAIRS
1990 Chevrolet Lumina APV V6-191 3.1L
A/T - Twenty Steps To Successful Repairs
1990 Chevrolet Lumina APV V6-191 3.1LSECTION A/T - Twenty Steps To Successful Repairs
TSB 89-27 (Sept)
SUBJECT: TWENTY STEPS TO SUCCESSFUL TRANSMISSION REPAIR
1. As you start work on a transmission, read your ATRA bulletins pertaining to that transmission. (If you do this every time, before you know it you'll have the bulletins memorized.)
2. Clean the entire transmission, including the valve body.
3. Check pumps, valve bodies, and cases for warpage.
4. Flat file pumps, valve bodies, and cases. (Just a few strokes with the file to knock off high spots and handle burrs.)
5. Check all pump gear clearances.
6. Check planet pinion endplay and side to side motion.
7. Soak all planet assemblies.
8. Soak all friction material for 15-30 minutes.
9. Sand, tumble, or replace all steel plates.
10. Re-surface all drums on which a band rides.
11. Replace all rotating oi1 control rings.
12. Check all oil control rings, and rubber products in their bores for proper fit.
13. Replace all major support bushings and bushings that control lube oil.
14. Pre-lubricate all bushings and thrust washers.
15. Pre-lube pumps.
16. Pre-fill torque converters.
17. Use available manuals to find specifications.
18. Set correct clutch and band clearances
19. Take the time to set total unit endplay
20. Use a torque wrench on all pumps and valve bodies.
SUBJECT: TWENTY STEPS TO SUCCESSFUL TRANSMISSION REPAIR
1. As you start work on a transmission, read your ATRA bulletins pertaining to that transmission. (If you do this every time, before you know it you'll have the bulletins memorized.)
2. Clean the entire transmission, including the valve body.
3. Check pumps, valve bodies, and cases for warpage.
4. Flat file pumps, valve bodies, and cases. (Just a few strokes with the file to knock off high spots and handle burrs.)
5. Check all pump gear clearances.
6. Check planet pinion endplay and side to side motion.
7. Soak all planet assemblies.
8. Soak all friction material for 15-30 minutes.
9. Sand, tumble, or replace all steel plates.
10. Re-surface all drums on which a band rides.
11. Replace all rotating oi1 control rings.
12. Check all oil control rings, and rubber products in their bores for proper fit.
13. Replace all major support bushings and bushings that control lube oil.
14. Pre-lubricate all bushings and thrust washers.
15. Pre-lube pumps.
16. Pre-fill torque converters.
17. Use available manuals to find specifications.
18. Set correct clutch and band clearances
19. Take the time to set total unit endplay
20. Use a torque wrench on all pumps and valve bodies.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.