I have searched through many threads and would like some feedback please.
My 955TT has 220,000 km or approx 136,000 miles on the clock as a preventative measure I intend to change the Transmission fluid.
What are the opinions on doing a Diy Flush similar to this thread. https://rennlist.com/forums/cayenne-...uid-flush.html
BTW I have done a very similar flush on my previous Mitsubishi 4wd Pajero / Montero with great results as it suffered from hard changes up until the flush.
My 955 Changes quiet smooth but not knowing if it had been done by previous owner and actual fluid in it is an unknown factor.
Therefore my options are to just drop the pan and do filter / screen and refill as per the many guides out there.
Or do i disconnect the lines as per link if it is even the same on the 955 and get as much fluid out as possible.
I have purchased the filter kit from pelican and have Mobile ATF 3390 Fluid.
I greatly appreciate all input and experiences.
Thanks

 

I just dropped the pan, replaced the filter and gasket and refilled till it dribbled out, started the car and kept filling (slowly and shifting through gears every now and then) till it hit the magical 40 degrees (via an iCarsoft).
Basically, everything DIYDan says on - I used Redline D4 ATF thou.

 

Thanks for your input mate

 

I did an overkill version of the flush method figuring it would clear the torque converter. First I drained the transmission, dropped the pan, replaced the filter and pan gasket, then pumped in the same amount of conventional Toyota fluid that drained out. I believe if you look closely, there are arrows on the cooler line thermostat block showing which one is pumping out and which is the return. I kept the return elevated and pumped out through the outbound line (to the cooler) while pressure feeding into the pan fill hole with a threaded adapter and pump. I collected another 3 quarts that way, and pumped in three new ones of the Toyota stuff. I didn't let it run for long - start it for a few seconds, row the gears, switch off. The pop out to see how much came out. Add that much back in. Repeat until about three quarts out and three pumped in.

Then I drained all of the fluid out of the pan through the drain plug, again. Pumped in the same amount of synthetic plus one, ran it cycled through the gears while pumping out into the bucket and constantly pumping new synthetic in. Did another three out the line and three pumped in. Finally, I reconnected the lines, pumped in what I though was about a quart extra, let it get up to temperature as I worked through the gears with foot firmly on the brake. Left it in Park, watched the temp come up just shy of 40 C, removed the fill pump adapter, and when it was down to a mere dribble, I screwed in the drain plug. Done.

For me, the critical thing was a BIG measuring bucket - looks like a giant measuring cup - to keep track of what came out, so I could pump at least that much...plus a wee bit more... in. Don't be afraid to pump in a little extra during the process with the understanding that you are going to let the extra spill out the drain plug while coming up to temperature. I had my old VAG COM cable from the days of D2 Audi A8 ownership, and with an adapter (or a pin jump) it is able to read nearly everything. Anyway, I monitored transmission temp with it and removed the filler setup just before hitting 40, watched a stream turn to a dribble, and capped it.

Here is the kit I used with an extra liter bottle added to the order: https://www.fcpeuro.com/products/por...yle-9patranskt

Here is the new sacrificial conventional Toyota fluid I used first:
And the128 Fl. OZ. measuring pitcher:
Cheapo threaded adapter for drain hole so you can pump in under pressure:
and the fluid pump itself:
I had some extra clear hose lying around, so I was able to extend my pump setup a little bit. I can't for the life of me remember how much I used. I blame the alcoheimers - alcohol induced memory loss. Ahhh wait, that's it, now I remember, I cobbled some to the end of the transmission cooler line to reach trusty five gallon bucket. As an old friend of mine is fond of saying, "We ain't launching the shuttle here, don't over think it." (but do give it some thought).

Regards,

Brian C.

 

Hi Brian
Thanks for the response. I actually did the transmission yesterday and was going to update thread tonight.
My method ended up being very similar to yours. On the outbound hose ( into the cooler ) i connected around 4 feet of clear hose with a clamp and ran that into a bucket. That way whilst my helper went through the gears I could pump new fluid in to keep pan topped up we did stop a couple of times to let me catch up and ensure pan didn't pump dry.
The hose also allows you to see the transition from old to new fluid.
I'm fortunate to have a hoist so doing this was pretty straight forward. But like yourself I believe in over kill then under. Also being that I bought car with 220,000kms on the clock I was not sure if it had been done. Service history is great always done at a porsche dealer to this point but no record of tranny being done.
I did find that old oil did not actually appear that old was still quite redish but definitely had a brown tinge. So it may have been done sub 200,000kms.
But now I know exactly when and how its been done.
I am going to get tranny back upto temp today and remove fill plug just to ensure level is correct then it will be job done.
well almost onto the headlight harness replacement lol
Take care

 

I had the clear hose on the coolant output for the same reason. Mine was approaching 150K when I did mine a few months back, along with the valve cover gaskets ( harder than it should be due to access), pressed in a urethane bushing in the top engine stay/dogbone, new front wheel bearings and halfshafts (GKS from FCP euro), and coolant tank. Two years back, I pulled the headlights due to erratic issues and electrical drainage. Someone had already changed the external patch harnesses. Pulled the bulbs and saw the insulation on the wiring inside the headlight was crumbling away causing shorts. Fixed it with marine grade shrink wrap, been fine ever since. I think DIY Dan on youtube had a video on how to do it. It is well worth your time to check out all of his Cayenne repair videos.

 

First off thanks for everyone's input I went the flush route as stated previously but thought I would add a few pics and rough description.
Step one
I started like a normal fluid change IE dropped the pan changed filter and gasket and refitted.
step 2 two
Filled pan back up till new fluid ran from fill plug.
I then located transmission thermostat at front right of vehicle.

Thermostat located at front right of vehicle

Step 3
Remove green bolt and pull fittings out of thermostat housing.

Lines removed from thermostat housing.

Step four
Attach clear hose to the line from transmission and place into a bucket.

My helper started the car with hand brake on and foot firmly on brake pedal then moved through gears whilst pausing in each gear for 5 - 10 seconds.
whilst doing this I was monitoring flow to bucket and at same time pumping new fluid in through fill port. When discharging fluid transitions from old to new ( you will see it )

Old fluid discharging

Have helper stop engine. reconnect lines back up then fill transmission back up and follow previously posted methods for filling to correct level.

Just a note this method can be a bit messy and I preformed it on a two post hoist.
I used around 11ltrs of fluid for the whole process including wastage.

Thanks

 

Hello all, this is all very helpful. I just bought a '04 955TT in 135,000 km, around 84 thou. miles. it has a problem in shifting from 3rd to 4th gear. Before diving into transmission valve body, i will make proper transmission flush as described by you all. At this point the question i have is whether anyone has any experience with Liqui Moly's ATF additive? I was told that the additive helped with shifting in other cars.