Wednesday, October 4, 2023

Why I did a Transmission Fill tube dipstick Flush! The Return or Lubrication Circuit of the Transmission

 "Losing prime on the transmission pump isn't a service - its a rebuild in many cases." 

 8-Never use your cooler lines to remove fluid from your transmission by starting the engine or in an attempt to flush by catching fluid in a pan while adding fluid to the dipstick. When this is done no lube is being sent to the planets and bushings and they can go dry and melt down very quickly destroying or significantly shortening the life of your transmission.

 the planetary gears and shafts don't get lubed, 'cause that's what the cooled fluid returning to the transmission does--lube the geartrain.

That's why I did a dipstick flush! Thanks - great quote. There's probably a dozen DIY vids on youtube of people doing transmission flushes by disconnecting their transmission cooler lines going in and out of the radiator - and thus flushing their transmission oil! Sounds great until you really dig down into the comments sections of these vids and discuss a couple - and JUST a couple of awesome comments:

new fluid is reintroduced into the unit through the return or "lubrication" circuit. This is the circuit at the end of the line which provides oil to the bearings and bushings as the transmission fluid returns to the sump (pan) where the pump picks it up to start all over again.

and

You are running the lubrication circuit dry without return fluid going back into the transmission. This circuit lubricates the bushings, Torrington bearings and the planetaries..

and

And do you really think it's smart to pump the transmission dry with all of the internal parts spinning?

 Needle bearings in the pan, first gear and/or reverse may be noisy: Either a torrington bearing or a planetary bearing is on its way out.

 https://www.freeasestudyguides.com/graphics/auto-transmission-input-shaft-endplay-b.png?ezimgfmt=rs:577x385/rscb32/ng:webp/ngcb32

 Wow I had to really SEARCH to find these comments. I was suspicious of NOT running return hose fluid back into the transmission. People claim they "don't have problems" from doing this but... better to listen to the real details going on behind the scene!!

So I put in 12 new quarts of ATF - half of them are OEM approved synthetic Valvoline and half are MaxLife Valvoline... hmmm. I discussed this with someone who claimed that since I was mixing the ATF I only got a 50% NEW fluid at the end. I then did the calculation. After 6 quarts of 12 quart capacity - I am now running 50% NEW fluid. After that I keep adding 100% NEW fluid and take out 50% new fluid... for the 2nd half. So that should be 75% new fluid at the end of 12 quarts and not just 50% new fluid. I can see why he would be confused without really doing the calculation.

I could actually notice the car driving better! so even better NO worries about the transmission not being lubricated... Also I made sure to use the ATF that I wanted to use.


 

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