Transmission Fluid Change - Would this work?

[PachoC]

I plan on changing the ATF, but I don't think I need to replace the filter (it has been replaced a couple of times before and the car already had 106 k miles), therfore I plan on following these steps:

1- Drain the pan, put plug back2- Measure the ammount of fluid drained, and add the equivalent qty of new fluid back in the transmission through the filler neck.3- Disconnect the return line from the radiator to the transmission and let it run into an empty container.4- Start the car and let it run for a few seconds (most likely less than 30) so that the pump in the transmission start pushes the dirty fluid still in the radiator out via the return line onto the container.Would the car need to be in PARKING or in NEUTRAL?5- After some ammount of fluid has been collected on the container (1~2 qts), stop the car.6- Measure the amount of fluid drained and add the equivalent new fluid via the neck filler.7- Repeat until clear, new, fluid comes out of the return line8- Measure and adjust final fluid level.

Does this make sense?

[maxnix]

I think when you read the previous posts on this subject (there are many), you will rethink this schema.

[Q45tech]

When you disconnect the fluid flow from the in radiator cooler, the rear planetary gear IMMEDIATELY is starved of fluid, distruction will occur in minutes!

It is not like an engine where the oil just drains back into the pan, it only goes back into pan AFTER lubing the planetary.

If you have to ------just drain the pan - refill, then run the engine 2.0 minutes [stopwatch please] and pan drain again- refill, repeat for 4 times.

The fluid flow thru the system is 4 quarts per minute brand new.At 3 quarts per drain x 4 you should have most replaced.

What you don't want is to wait too long for all the new fluid to be back in pan when you drain obviously some mixing but having most of new in TC or cooling lines and not in pan would be best on next drain.

As the pump wears the exchange rate of flow lengthens but you don't know if it is 4 quarts per minute or 3 usually never longer [slower] than 2.5 quarts per minute flow.

Not 1 tech in 50 knows the flow rate thru the cooler/heat exchanger at idle in a Q. I've asked dozens they all guess wrong.

[Q45tech]

I've timed at least 60 Q during the exchange process to get flow data. J30 are different as are ALL Lexus [much slower] they don't send all the TC flow thru exchanger.

[Q451990]

Not 1 tech in 50 knows the flow rate thru the cooler/heat exchanger at idle in a Q.

I bet Byron does (even if he doesn't want to admit it)

Heath

[Q45tech]

Most great techs are not engineers and their thought processes are trained in a different manner............I often spend way too much time collecting test equipment, getting data, and analysing data to ever repair anything.

The correlation of 14 quarts [in a BG Machine] requiring 3 minutes 30 seconds to exchange is lost on many where a 10.5 quart capacity is concerned.

You can almost tell how a Q transmission will shift by the exchange time of the BG Machine...........pump health and resulting internal pressure.

[qship96]

When you disconnect the fluid flow from the in radiator cooler, the rear planetary gear IMMEDIATELY is starved of fluid, distruction will occur in minutes!

It is not like an engine where the oil just drains back into the pan, it only goes back into pan AFTER lubing the planetary.

If you have to ------just drain the pan - refill, then run the engine 2.0 minutes [stopwatch please] and pan drain again- refill, repeat for 4 times.

The fluid flow thru the system is 4 quarts per minute brand new.At 3 quarts per drain x 4 you should have most replaced.

What you don't want is to wait too long for all the new fluid to be back in pan when you drain obviously some mixing but having most of new in TC or cooling lines and not in pan would be best on next drain.

As the pump wears the exchange rate of flow lengthens but you don't know if it is 4 quarts per minute or 3 usually never longer [slower] than 2.5 quarts per minute flow.

Not 1 tech in 50 knows the flow rate thru the cooler/heat exchanger at idle in a Q. I've asked dozens they all guess wrong.

FOR BRIAN TO READ YET AGAIN..................

[maxnix]

FOR BRIAN TO READ YET AGAIN..................

I missed the part where Dennis said this works as good as a mechanical fluid exchange.

You did too.

He has never advocated nor stated a drain-and-refill is equivalent to a mechanical exchange. In his accounts of his maitenance of his second new OEM transmission, not once did he perform a simple drain and refill. End of story.

The correlation of 14 quarts [in a BG Machine] requiring 3 minutes 30 seconds to exchange is lost on many where a 10.5 quart capacity is concerned.

Hmmmmm....why is that, one wonders?

Member's standards vary. Q45tech

[qship96]

[QUOTE=maxnix]I missed the part where Dennis said this works as good as a mechanical fluid exchange.

Brian,as Arnold would say,,,You stuuuupid,you idioooooot... if you read AND COMPREHEND what qtech said about 4 drain/fills replacing most of the fluid,and reread my post about completing 6 drain/refills accomplishing a net result of 80-85% new fluid,maybe you will grasp the idea that both methods are resulting in the same goal.....one just frees up $100 and prevents some yahoo from potentially screwing up your cooler connections,incorrectly fasten underbelly sheild,soiling your leather and interior,and wasting time in a shop-yes member standards certainly do vary,and I for one am not to lazy to do the job myself,correctly,the first time,without messing up my car...maybe youjust like using the rubber bladder machine soo much because it reminds you of douche bags?

[Q45tech]

I would rather see a member do a 3-4 quart pan drain and refill every 6 months than wait 3 years for a BG flush

[maxnix]

I would rather see a member do a 3-4 quart pan drain and refill every 6 months than wait 3 years for a BG flush

But as you documented with your second transmission, better to mechanically exchange the fluid every 15K.

That is the whole point. A drain and refill is in no way as comprehensive for evacuating old used fluid and replacing with new.

It's like the Taliban; just because you believe you are right doesn't make you right. Hard data in a controlled environment is the only thing that counts. So far, Q45tech has the best data, including timed shift intervals throughout the 173K miles he regularly maintained his second transmission. Until someone submits equal or superior data, his observations hold the most relevance. Feelings and other subjective dogma don't count.

Personal insults are an indication of the author's own depth of ignorance and lack of mental competence.

Once again, "Member's standards vary." - Q45tech

[qship96]

Brian,you have a hard time admitting when you are wrong,even when the master-tech spanks you....................and as far as your whining....remember I have 190,000+ miles on my original transmission- for someone with such low mile cars,you should be eager to learn from the ones with successful high mileage maintenance procedures since you lack this

[Q45tech]

Remember there is/was quite a bit of life difference between the 90-93 and the 94-96.

So don't compare limes to passion fruit.

It is harder to get longer life from a 90-93 even with 1st gear start just due to the stress from gear ratios and the lack of ATF filters and cooling deficiencies.

We see original 94 with 200k+ all the time.

[qship96]

Good to hear this,as I would like to keep the ole q till 250,000 without replacing the transmission.

[bullittandy]

[QUOTE=maxnix]

It's like the Taliban; just because you believe you are right doesn't make you right.

Personal insults are an indication of the author's own depth of ignorance and lack of mental competence. [/QUOTE]

That's quite a stretch to compare a fundamentalist religious/cultural ideology to changing transmission fluid.

Remember this second quote the next time you greet a new member or respond to an old one.

[mikeatx]

So where does this BG Flusher connect up to the '03 Maxima's transmission?

I'd imagine I can rig up something to pump 14 qts of fluid into my transmission and drain the rest out the other side...

I have a small hose pump that connects to a drill... and it will suck 55 gallons of water out of my water heater in about 10 minutes at full speed...

So basically need a 14 quart container of new fluid, an empty contain with room for 14 quarts and my pump with some hose...

Where do I hook this up? at trans cooler raidiator connections?

Thanks

[AlabamaDan]

Ok, don't flame me. I know I haven't been keeping my Q up to NICO standards, but I'm trying to make up for it now.

I've never changed my Trans Fluid and I don't know what the previous owner did. So, before I get it back out of the stable, I should probably do this.

I'm liking the drain, refill, run 2 mins, repeat, repeat, repeat. My reaons is that I've heard that one a transmission that hasn't been maintenanced well a "Flush" might cause more trouble that good. Is this just a myth?

[DrewQ45]

Ok, don't flame me. I know I haven't been keeping my Q up to NICO standards, but I'm trying to make up for it now.

I've never changed my Trans Fluid and I don't know what the previous owner did. So, before I get it back out of the stable, I should probably do this.

I'm liking the drain, refill, run 2 mins, repeat, repeat, repeat. My reaons is that I've heard that one a transmission that hasn't been maintenanced well a "Flush" might cause more trouble that good. Is this just a myth?

Along with fluid degradation, one of your biggest worries right now should be whether your transmission filter is nearly clogged... a great likelihood.

zerothread?id=234307

[szh]

Remember there is/was quite a bit of life difference between the 90-93 and the 94-96.

So don't compare limes to passion fruit.

It is harder to get longer life from a 90-93 even with 1st gear start just due to the stress from gear ratios and the lack of ATF filters and cooling deficiencies.

We see original 94 with 200k+ all the time.

Hmmm ... maybe, but lack of attention can still causes problems, IMHO. My 1995 Q45 had a transmission failure at just over 100k miles ... even though I did a full fluid flush at 90k miles. The previous owner simply had not cared about it enough.

My one and only, and it will be my last, experience with a lease return car purchase!

Z

[Haitian_King]

*HAHAHAHA*

I'm positively dying with laughter. Glad to see that I'm not the only one.

[96Qowner]

I'm positively dying with laughter. Glad to see that I'm not the only one.

Ya, we been here before.