Register now to get rid of these ads!

Technical Torque converter flush?

Discussion in 'Traditional Hot Rods' started by AGELE55, Nov 16, 2021.

  1. AGELE55
    Joined: Jan 4, 2018
    Posts: 398

    AGELE55
    Member

    I picked up a 700r4 for cheap. Fluid is somewhere between red and brown. I plan to degrease it , drain and refill, and see how she runs.
    Any way to flush the removed TC while its out? No sense putting in a new one in a questionable tranny.
     
  2. TA DAD
    Joined: Mar 2, 2014
    Posts: 534

    TA DAD
    Member
    from NC

    I have always just put them in the parts tub after draining it as good as you can and sticking the hose in it and letting it flush out with varsol.
     
  3. Marty Vanin
    Joined: Feb 22, 2017
    Posts: 67

    Marty Vanin
    Member

    Just turn it upside down and let it drain for a few hours.Remember that converter has a clutch lining inside and pumping varsol into it may deteriorate the lining. Okay to do that on non lockup converters.
     
    AGELE55 likes this.
  4. Elcohaulic
    Joined: Dec 27, 2017
    Posts: 2,598

    Elcohaulic
    Member

    I was taught to never use solvents on automatic transmissions and rear end gears.. Flush them with the oil that they run on..
     
    46international and AGELE55 like this.

  5. squirrel
    Joined: Sep 23, 2004
    Posts: 50,275

    squirrel
    Member

    you can drain it, then add a quart of ATF, slosh it around, and drain again. And repeat until you get tired of it. Don't expect much improvement.
     
  6. MeanGene427
    Joined: Dec 15, 2010
    Posts: 1,963

    MeanGene427
    Member
    from Napa

    Yep, I would never use solvent- just let it drain overnight. And wish you had a Ford converter equipped with a drain plug lol
     
  7. sunbeam
    Joined: Oct 22, 2010
    Posts: 5,392

    sunbeam
    Member

    This has worked for me . Lay the converter flywheel side down stick a hose as far down as you can then use an air blow gun with a shop rag wraped around it so it will seal the converter and pressure the converter so the oil will flow out the hose
     
  8. oldsman41
    Joined: Jun 25, 2010
    Posts: 1,556

    oldsman41
    Member

    I just let them drain out for a day and put fresh atf in a quart is fine slouch and drain for a day fill and get busy
     
  9. jaracer
    Joined: Oct 4, 2008
    Posts: 1,315

    jaracer
    Member

    When I taught automatic transmission repair many years ago, I bought a machine to flush torque convertors. It pumped solvent in the middle while slowly turning the convertor. About every 15 or 20 seconds it delivered a blast of air with the solvent. If the convertor didn't have a drain plug, the company that built the machine supplied 1/8 in pop rivets with a sealed end. You drilled an 1/8 in hole in the outer diameter staying in the pump region of the convertor. That way you could drain all the fluid before putting it on the machine. Since the machine had a lid, you just left the hole open while cleaning. After you let all the solvent drain, you installed the pop rivet with a little sealer. It worked very well.
     
  10. TA DAD
    Joined: Mar 2, 2014
    Posts: 534

    TA DAD
    Member
    from NC

    Well imagine that ! using solvent to flush a converter out.
     
  11. squirrel
    Joined: Sep 23, 2004
    Posts: 50,275

    squirrel
    Member

    were those lockup converters he was flushing with solvent?
     
  12. Our converter flushing machine uses atf and air to flush them
     
    Desoto291Hemi and VANDENPLAS like this.
  13. I have been told to drill a 3/16" hole, tap it 1/4-20, and put a set screw in it with sealant on the threads. Never had the nutsack to try it.
     
  14. RmK57
    Joined: Dec 31, 2008
    Posts: 2,002

    RmK57
    Member

    I wouldn't want my converter to be number 47 on the flushing list if your using the same oil. Even if it was filtered.
     
  15. I honestly don’t know how often it gets changed. We are a little different then a production shop.
     
  16. Kevin Ardinger
    Joined: Aug 31, 2019
    Posts: 367

    Kevin Ardinger
    Member

    Can’t do that on a lockup converter. You will drill into the clutch.
     
  17. I don't ever use that new fancy stuff.
     
    Kevin Ardinger likes this.
  18. Marty Vanin
    Joined: Feb 22, 2017
    Posts: 67

    Marty Vanin
    Member

    But , for the guys that do use the new fancy stuff,Kevin is right.Leave the drill in your tool box.
     
  19. jaracer
    Joined: Oct 4, 2008
    Posts: 1,315

    jaracer
    Member

    That was just before lockup convertors came out.
     
  20. jaracer
    Joined: Oct 4, 2008
    Posts: 1,315

    jaracer
    Member

    Not if you drill in the pump area of the convertor. The clutch material is in the turbine area.
     
    Randall, loudbang and Mark Yac like this.
  21. Yes...then use a 1/8th pipe tap with some grease on the tap to catch the metal. If you can pressurize just it a bit at the hub, all the better. Use an allen head brass plug and it should seal on its own.
     
  22. Simple solution. Spend $100 buy a new convertor. Problem solved
     
    Budget36 likes this.
  23. Elcohaulic
    Joined: Dec 27, 2017
    Posts: 2,598

    Elcohaulic
    Member

    I like the 1957 to 64, four speed, Super Hydra-Matic. It had a drain plug on the coupling..
     

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.