scotsman60

Stephen,

From memory the service interval on the transmission is 25,000 miles which must be close to 40,000 km.

The service is really easy and cheap and replacement of the unit if it breaks is expensive so I'd service every two years if you're not doing many miles.

By the way, the reason I know about the oil in the pan after draining and the fact that there was pool of ATF on my garage floor are related....


Doug

johnfm

Doug

did you have the car up on a hoiust, or just a jack & stands. I just had a ATF pipe crack a leak & will need to top up after I replace the pipe. If its a hassle I will get the car to a grage on a flatbed (it gushes oil when I start it now due to the leak!!)

mojorizing

Hi John,

I had my car on jack stands on the highest notch (about a foot and a half off the ground). Tonight I'll look at the PET and see what tubing you're changing out, but it sounds like job, no doubt.

mojo <img border="0" alt="[bigbye]" title="" src="graemlins/xyxwave.gif" />

johnfm

pipes 15 & 18 on the auto tramission oil pipe page- they run up the left hand sill from the rear wheel arch to the front.

mojorizing

Hi John,

I see those two pipe sections on my PET. The good news is that #18 is $44.97 and #15 is $47.01 from Sunset Porsche as an estimate of the cost of materials here in the States. I would replace both of them, considering the low price. Does it appear that the leak is at one of the pipe brackets, possibly from chafing thru the pipe, or from internal pitting?

mojo <img border="0" title="" alt="[Eek!]" src="eek.gif" />

johnfm

External corrossion just before the first rear bracket. Fairly flaky rust onjust one pipe - years of dirt which unfortunatley holds moisture - stil I cannot believe the pipes aren't corrosion resistant -they are VERY important pipes!!

I am getting both pipes ($61 US over here - you lucky guys, things are cheaper when you export them thousands of miles apparently!!)

scotsman60

JOhn,

I had mine on moderately high jack stands. To do the service you don't need much room.

Of course it would be _easier_ to do all of the work you need to do while standing.....

As an aside, I had to replace my Tiptronic a couple of years back after one of the lines was broken by a chunk of wood on the freeway (fell off a truck and I couldn't avoid it). By the time I figured something was wrong all of the fluid was on th efreeway and the transmission was toast.

Doug

johnfm

Since they monitor oil temp in the tranny anyway (for the tip control unit), a little gauge or warning would be useful when temp reaches critical!!

I may see if I can have a electrically handy friend tap into the wire.

johnfm

Just had a realy good look under htere tonight - leak is corrossion, but at the bracket - I expect the corrossion has weakene the pipe and the bracket clip has finished the job!! Not great design I'm afraid. It seems a bit of a bugger to get to at home with just a bit of wriggle room under the stands - I can see me getting covered in ATF oil, stripping some nuts, screwing up some perfectly good sills....

..its off to the specialist for this one.

scotsman60

John,

There's a warning light for the tip tranmission but it didn't come even when all of the fluid had dumped onto the freeway!!!

A level indicator or a pressure switch would seem to make sense.....

Doug

johnfm

Doug

the warning light (in the clock) is probably only for electronic glitches. Adrian may know whether or not it will light for a high temperature problem.

Adrian

Dear John,
The warn light will light up for a fluid over temperature problem. As you all know I am sure that the ATF cooler is mounted to the oil cooler and uses the oil cooler fan. At 90C ATF temperature the oil cooler fan will crank up independent of oil cooler temperature.
The temp sensor is measuring fluid temperature not transmission temperature. The loss of fluid from the transmission will not necessarily show up as a fluid temperature problem. I guess that Porsche did not consider the total loss of fluid as being a likely fault and did not cover it. I might point out that transmission fluid levels are not covered by any monitoring systems in manual systems either.
Ciao,
Adrian
911C4

johnfm

Doug

I am planning to use a little drill operated pump to pump the ATF flluid in via the 'quick connector', just to the right of the level indicator. What size hose was needed & do you need a special connector, or just a tight fitting hose pushed over the connector??