Trans Service Advice
Hotshot
Joined: Jul 2005
Posts: 13,834
Likes: 25
From: Middle Tn.
No your mixing 8 qts. of new fluid with the 8 qts. that are left in the tranny after draining the pan.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
It takes 30 minutes because the thermostat is closed the entire time. When it's closed 90% of the flow is diverted to lube and then the pan instead of going to the cooler. Then the new and old fluid mix in the pan and go through the cycle again, with only 10% of the mixed fluids going to the flush machine.
When the thermostat is open the cooler lines see about 2-3 gallons per minute. 16 quarts should take about 2 minutes.
When the thermostat is open the cooler lines see about 2-3 gallons per minute. 16 quarts should take about 2 minutes.
Post Fiend
Joined: Jul 2005
Posts: 6,127
Likes: 6
Most contaminants only move through a system when under pressure and at operating temps... so for me, this is why I have elected to install a coolant filter and a P/S fluid filter... to catch what settles in the low lying areas of each system and hopefully will eventually get caught by the filter.
Who knows... I may need to add a Magnafine P/S filter to my window-washer fluid line... now that will be a first... "filtered window washer fluid"!!!!!!!
Who knows... I may need to add a Magnafine P/S filter to my window-washer fluid line... now that will be a first... "filtered window washer fluid"!!!!!!!
Right on... pressure and heat is needed to get the crud loosened.
Do you filter your beer?
Senior User
Joined: May 2007
Posts: 132
Likes: 0
So if I understand this correctly you basically have 8 quarts of fluid on each side of the thermostat. 8 on the cooler side and 8 on the pan side. So if I pull the plug on my pan I drain out those 8 quarts on that side of the thermostat. I don't think I have ever seen my tranny temp gauge hit 165 so does that mean that the eight quarts on the cooler side never mix with the pan side? If that is the case then it would seem that the only way to get a complete fluid change would be with a hot flush and draining 8 quarts every other oil change isn't really achieving what many people think it is. What part of the tranny exactly is the stock temp sender getting its reading from?
Post Fiend
Joined: Jul 2005
Posts: 6,127
Likes: 6
Generally, transmissions are the better engineered parts of a Ford.
Some snags with electronics, electromechanical, and especially with temperamental parts like the temp sensor and wiring... but my transmission is factory stock.. and working great.
And be rest assured for most of its life, it wasn't a grocery getter.
It was loaded right up to / or past its GVWR
Some snags with electronics, electromechanical, and especially with temperamental parts like the temp sensor and wiring... but my transmission is factory stock.. and working great.
And be rest assured for most of its life, it wasn't a grocery getter.
It was loaded right up to / or past its GVWR
Got Diesel?
Joined: Jan 2004
Posts: 4,345
Likes: 21
When I drink my beer.... my stomach filters out the sediment, my liver & kidney's filter out the alcohol and when I pee.. that is the "pressure that is flushing it all away!!!!
Got Diesel?
Joined: Jan 2004
Posts: 4,345
Likes: 21
It takes 30 minutes because the thermostat is closed the entire time. When it's closed 90% of the flow is diverted to lube and then the pan instead of going to the cooler. Then the new and old fluid mix in the pan and go through the cycle again, with only 10% of the mixed fluids going to the flush machine.
When the thermostat is open the cooler lines see about 2-3 gallons per minute. 16 quarts should take about 2 minutes.
When the thermostat is open the cooler lines see about 2-3 gallons per minute. 16 quarts should take about 2 minutes.
What training documents, TSB's, weblinks could you send me or point me towards to help prove what you have just educated me on... about "hot-flushing and that at least on my 6.0L tranny... I have not been getting what I was paying for.
Based on your signature... you definately are the authority... so I am all ears and maybe can get my dealer to help me out if I can politely prove the error of their past ways.
Maybe we can exchange emails via PM's to exchange information if that would work?
Thanks,
Jeff
(Beachbumcook)
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
The thermostat changes where the output of the torque converter is sent. When it is cold the thermostat sends 10% of the torque converter output to the coolers. When it is hot 100% goes to the coolers.
The temp sensor is on the solenoid body in the pan.
We can try. Even when I was at Ford I couldn't convince dealers of the errors of their ways. They know everything and didn't want to listen to engineering.
Post Fiend
Joined: Jul 2005
Posts: 6,127
Likes: 6
It takes 30 minutes because the thermostat is closed the entire time. When it's closed 90% of the flow is diverted to lube and then the pan instead of going to the cooler. Then the new and old fluid mix in the pan and go through the cycle again, with only 10% of the mixed fluids going to the flush machine.
When the thermostat is open the cooler lines see about 2-3 gallons per minute. 16 quarts should take about 2 minutes.
When the thermostat is open the cooler lines see about 2-3 gallons per minute. 16 quarts should take about 2 minutes.
Why wasn't the thermostat designed with a "service bypass" that allow the transmission to be drained / flushed without the inconvenience of requiring a "hot" flush machine and the purchase of effectively, the amount of fluid needed for the flush?
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