XJ XJ6 / XJ8 / XJR ( X350 & X358 ) 2003 - 2009

ZF 6HP26 Transmission Fluid Flush DIY

 
  #21  
Old 05-09-2019, 06:41 PM
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Originally Posted by Don B View Post
Hi Wingrider,

Another great question! No, neither the sprayer nor the Mityvac can keep up with the flow rate of the transmission's pump. That's why I don't try to do the flush all in one continuous action. I run the engine just long enough for about 1 liter of fluid to be ejected (watching the graduations on the catch bucket), shut off the engine and add 1 liter of new fluid. Slower than a continuous action, but reduces the risk of the transmission ever running more than 1 liter low.

Cheers,

Don
What Don is saying above is that you do this 1 liter at a time using the Mityvac to pump in a liter when 1 liter has been expelled.

What you detail about changing the pan etc is the best option so that you have entirely new fluid in the pan before starting Don's procedure.

Which is what I did.

I use an infra red thermometer to check on temperature although SDD would be a bit more accurate if you can figure it out.
 
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  #22  
Old 05-11-2019, 03:48 PM
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Originally Posted by jackra_1 View Post

I use an infra red thermometer to check on temperature although SDD would be a bit more accurate if you can figure it out.
Thanks jackra_1. I spoke to a local transmission mechanic. He is willing to do the flush for me for $75 (my materials). He said he is hesitant to do a complete flush all at once in any transmission with high mileage,
as he fears that the high concentration of fresh detergents in new transmission fluid could knock loose any crud in the transmission and gum up solenoids.

So I decided that while I wait for the pan/filter I ordered to arrive, I'd drain the pan and put in new fluid, then run the car a few weeks, so that there is a chance for the new fluid to clean a bit, but maybe mitigate the above risk. I put the car up, opened the fill plug first, and about 2 full quarts of fluid drained out. Hmmm.. The transmission was over 35 degrees C. So was it severely overfilled? I went ahead and drained the rest, and it measured about 4.5 quarts total. So as I fill the transmission, it only took about 3 quarts to fill to overflow, with the engine running and the transmission temp reading 48 degrees C.

I let it cool off a bit, but in this Florida weather (92 F/33 C outside today) it takes about 2 minutes for the transmission to heat up to over 57 degrees C.

I'm going to check it one more time, lower it, and go for a drive. But I'm not really thrilled that I drained 4.5 quarts, and am about to drive it having only put in 3 quarts.
 
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Old 05-11-2019, 04:03 PM
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https://www.jaguarforums.com/forum/s...plained-37802/

Have a look at the above thread.

The correct fill temp is 40 degrees C. If you are over that temp the existing volume of the fluid expands and of course if you are under that the volume will be less.

Its tough as it can take quite a while for things to cool down once you are above 40 C.

The car has to be level throughout.
 
  #24  
Old 05-11-2019, 07:15 PM
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Hi FloridaPilot,

In addition to the thread John referenced, the ZF document I attached to my original post gives the filling procedure and temperatures.

I have found that if you use an infrared thermometer, you should aim the laser at the fluid draining from the fill hole for the most accurate reading. Plastic is a poor conductor of heat, so if you measure the pan temp it will be lower than the fluid temp.

The first time or two that I did fluid changes I used SDD to monitor the trans fluid temp - I can't remember how I got to that reading, but I think you can find a service routine that will display it. You may need to start a diagnostic session and enter transmission symptoms in order to get it to come up with Recommendations that include an appropriate service routine. Sorry I can't recall. Since I purchased an Autel MaxiSys Elite scan tool, it is so much faster than SDD that I use its Live Data function to monitor the trans temp sensor. Most scan tools with Live Data can probably do the same.

Cheers,

Don
 
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Old 05-13-2019, 08:30 PM
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I have a 2004 XJ8. I have not had the pan off but I assume the filter has a male fitting that fits into the transmission for the fluid pick up. On other cars I have cut that nipple off the old filter and glued a clear tube with the right ID to the that nipple. The nipple is pushed into the trans and the other end of the tube attaches to a very large funnel. I can hold the funnel in one arm and put 10 quarts of fluid in it (or more). A helper starts the car and the transmission sucks the fluid out of the funnel in a very short amount of time. When I see the fluid clearing the tube cut the engine.


It seemed a logical way to me and I did not have a transmission problem. The transmission is getting fluid just as if the pan were in place. I have a large catch basin under the trans. 10 quarts went in so 10 quarts came out. I put in the new filter and pan, add the required 5 quarts and done.
I thought this better than a flush using the cooler lines. No chance of cross contamination, you have a new filter and 100% new fluid.

Do you see anything wrong with this? It's one thing to put my Ford Focus at risk, but not my Jag.
 
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Old 05-13-2019, 10:03 PM
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Originally Posted by tomcoo View Post
On other cars I have cut that nipple off the old filter and glued a clear tube with the right ID to the that nipple. The nipple is pushed into the trans and the other end of the tube attaches to a very large funnel. I can hold the funnel in one arm and put 10 quarts of fluid in it (or more). A helper starts the car and the transmission sucks the fluid out of the funnel in a very short amount of time. When I see the fluid clearing the tube cut the engine.

It seemed a logical way to me and I did not have a transmission problem. The transmission is getting fluid just as if the pan were in place. I have a large catch basin under the trans. 10 quarts went in so 10 quarts came out. I put in the new filter and pan, add the required 5 quarts and done.
Hi Tom,

If I understand your description, by your method you could replace the fluid in the torque converter and some other areas of the gearbox. But to complete the fill you would have to then disconnect your fill tube, reinstall the pan, and add the remaining fluid via the regular fill hole. Otherwise the half of your 10 quarts of oil that would normally live in the pan would just spill out of bottom of the transmission. That's the biggest challenge I envision with that method: the potential mess involved with fluid spilling into the transmission via the cooler return pipe, hitting transmission internals, then spraying everywhere out of the large opening normally covered by the pan. Trying to catch all of it in any normal-sized pan or tray might be a challenge. How have you solved that problem in the past?

When I began searching for a means of imitating the professional method of flushing the fluid via the cooler line ports, one of the chief attractions was the reduction of the mess involved in the job.

Cheers,

Don
 

Last edited by Don B; 05-13-2019 at 10:13 PM.
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Old 05-20-2019, 09:49 PM
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Yes it is messy, I have 2 foot square pan to catch it all. So not much spills outside the pan. You put the pan with filter on and add required amount of fluid.
 
 
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