Transmission Torque converter oil flush question.

I plan on doing a full flush of oil out my camry tranny.
It seems so pointless doing an oil drop just out of the pan, when the Torque convertor holds afair bit of oil as well.

The method Im going to use, is to disconnect the "out" pipe of the tranny, that goes into the radiator, and place that into another container.
I start the car, but leave it in Park. The tranny pump, will pump the oil out into the empty container...
while i keep an eye on how much comes out, and then pour in the amount coming out.

What Id really like to do, is do the above method, but let it pump almost all the oil out, before starting to put in more new oil. To make sure all the old oil doesnt mix with the new...as much as possible.

So the question is, if too much oil is drained out of the tranny, meaning out of the TC as well, will the TC self bleed any air out, when the new oil is put in?
Since its not under load, will pumping oil out, damage the TC or tranny?

Any thoughts?
Im doing this, because i towed a trailer with too much weight in it, and its burnt the oil, ithink. It smells of tranny oil now, when i come up the long hill to my place.
Which it never did before the long trailer event.
So i want to replace the tranny oil completely. And i saw this method on youtube.
Thanks

Comments

  • jamesincJames (@jamesinc) Oz Volvo Ice Fortress
    Using that method I always see it not recommended to drop more than one or two litres at a time. FWIW I just drain the sump and refill it, and repeat that process periodically.
    ToomanyVolvos
  • Ex850RSnoopy (@Ex850R) Somewhere Over the Rainbow. Melbourne.
    You use more doing your method but only a little at a time to get clean fluid but clean fluid is clean......
    cancer sucks
  • CanoeCanoe (@Canoe) Sydney,NSW.
    edited April 25
    Using that method I always see it not recommended to drop more than one or two litres at a time. FWIW I just drain the sump and refill it, and repeat that process periodically.

    Thanks, trouble is, when you do a partial drain, there is still lots of old oil still within the tranny. I was hoping to somehow drain maybe 90-95% out.
    Might modify the above method. Drain the sump. Refill, then do the method mentioned at the start, and pour in one liter at a time after...if that makes sence. :-)
  • Ex850RSnoopy (@Ex850R) Somewhere Over the Rainbow. Melbourne.
    Does.
  • What's the harm in draining whatever volume drains out and refilling with the same volume, then repeating at the next service? This way the fluid will eventually always be one service old
  • jamesincJames (@jamesinc) Oz Volvo Ice Fortress
    You can just drain the sump and refill, then run the car for a few km, then repeat. Your fluid will gradually get cleaner. Also if you dump the whole lot at once you sometimes can experience transmission shock, if the gearbox has lots of wear.

    On my 850 I went through about 12L before the fluid coming out was a nice clean red.

    One other trick I haven't tried is draining from one cooler line and simultaneously filling from the other, but I don't know if that would work without pressure behind the fluid.
  • CanoeCanoe (@Canoe) Sydney,NSW.
    transmission shock,
    What will happen with that?
    The tranny has only done 230Ks.

    The guy in the youtube video, let the pump pressure push the oil out, and then poured oil in through the dipstick tube, to re-fill.
    Thanks
  • There is no need for overthinking a transmission service

    Just change the fluid three times in 18 months, job done

    PS if you really want to do a thorough job, change the filter and pan gasket on the third fluid change
    c30c30
  • CanoeCanoe (@Canoe) Sydney,NSW.
    On my 850 I went through about 12L before the fluid coming out was a nice clean red.

    would you say it shifted gears better...and didnt "thump" as much, when changing gears?
  • Pour into dipstick tube or fill hole at same rate as is pumping out
    Will take about 20L for a full flush but you will watch the colour drastically change while your doing it
    I think you need to add i was in an s80 with three wheels getting pulled backwards and was told to "hold on shit is about to get real".
  • jamesincJames (@jamesinc) Oz Volvo Ice Fortress
    On my 850 I went through about 12L before the fluid coming out was a nice clean red.

    would you say it shifted gears better...and didnt "thump" as much, when changing gears?
    It does shift nicer. I don't know what you mean by thump, in the 850R I gather it is supposed to shift hard. The thing you don't want is flaring as it shifts (where the revs jump up during shift)
  • edited April 26
    I had an 850R which would thump/clunk on gear changes under acceleration, usually from 1st to 2nd. I changed the oil and the transmission died shortly thereafter. I would exercise some caution and in future choose the partial oil drop method, rather than attempting to do it all in one hit.
  • CanoeCanoe (@Canoe) Sydney,NSW.
    edited May 14
    Thought Id update what happened.
    I dropped the oil out of the pan. Man, black as.
    Then put in 4 liters of fresh TF,
    I drained the pan, because if you just put in new oil, as it comes out, then you have diluted fluid in the pan, when what you want is new stuff geting pumped around into the rest of the tranny.
    So right from start, its not diluted, but fresh stuff from the pan.
    Then drained out 3, then put in 3. (leaving one liter always in the pan)
    Repeated this, till id used 12 liters.
    Oil color HEAPS better,
    Changes better. When first going from park to drive, it doesnt "thump" anymore. Nice and smooth.
    Probably do this again in 12 months.
    Also put in Nulon tranny additive. This made the tranny a lot smoother last time i put it in over a year ago.
    Glad i did the whole thing, considering how black the TF was!
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