My 1991 S4 upper Trans oil return hose is brusted and leaks out trans fluid.

No. 7 in the diagram, it is quite long. How hard to replace it? Thanks.

 

Hi Kevin. You can replace both rubber end hoses with any good low pressure oil hose, I used Aeroquip 300 PSI blue hose and stainless end crimp clamps. The front can be done on the car, the rears are best done with the mid and rear exhaust pipes removed and the heat shields off. If the metal line is broken you can try having it welded, or just get a new one. Usually the stock crimp fittings start leaking from age. It's worth it to just do both ends at the same time. Hope that helps.

Kevin

 

Thanks for your good advice. May I ask the size of the rubber hoses?

Thanks again.

 

Kevin, the hose I used is about 8mm or 3/8 inch. You will need about 60 or 70 inches of hose and match the old ones length. Worked great. They are a pain in the butt to change, but if you have the tools you can do it yourself.

Kevin

 

The hose is NLA from Porsche.

 

Take it to a hydraulic shop near you - ask around at NAPA shop or other auto service shops to find one. They can easily install new hose and crimp on some new connectors for you.

 

Getting that complete line out of the car is a tough job....but possible.

Far easier to repair in place.

I have several methods, depending on budget, available tools, skill level.

Here, we always silver solder a -6 male (steel) end onto the line and then fabricate a replacement line that attaches to that -6 fitting and then to the cooler. (We reuse the fitting at the cooler, because of the tight bend it makes and weld another -6 male end onto it.) Because the A/C compressor needs to be removed and there is flame and heat involved, this is the most difficult way to repair the line.....but the most reliable.....and the "hose" section is easy to replace, should it ever leak again.

The second way is to build the same replacement line and then use a fitting on the line with a ferrule inside. Self crimps and seals on the line. Still need to weld a -6 male bung onto the fitting at the cooler.

The third way to just use replacement sections of hose and crimp clamps. Although this is the least desirable method of repair, it is the easiest, quickest, and most "low skill required" way to repair the problem. The majority of this style repairs "suffer" from using "generic hose" and regular hose clamps. The hose is usually not "study" enough for this application and the clamps do an inadequate job of tightening down, on the hose.

I'm one of Goodridge's stocking dealers and have spent considerable effort in obtaining custom/proper pieces to make replacement fuel lines, other hoses, for the 928 vehicles. I have a complete kit with the highest quality, high pressure, transmission fluid compatible hose I can find (not Goodridge....their product isn't "good" enough for me to sell, in this application), along with crimp clamps that keep better, more uniform pressure on the outside of the clamps.

Not "bullet proof" like when you use weld on fittings, with custom Teflon lines to connect, but fairly economical and certainly has the best pieces available for this application. (Roger an I are discussing if a "kit" with enough hose and enough clamps to do any vehicle is the most practical solution or if multiple kits for the different years would be better. Price will be dependent on this decision, since a "universal kit" would have "extra" hose and "extra" clamps for the '87 model year, but raise the cost some. For both Roger and I, a completely universal kit is the easiest and most practical way to go.)

 

These hoses are a constant issue with my customers. Either not available, too hard to remove, too big and expensive to ship.
I NEED your kits Greg please.
Are they specific to each hose or will one kit cover a number of these transmission hoses?

Please send me two kits for this particular hose by USPS Priority Mail and I will DHL one to Kevin in Hong Kong.

Greg you are wearing your 928 Superman shorts again 8>).

 

I'm soon gonna need these as well, my likes are leaking but I haven't done anything about it yet

 

I can do one hose, I can do front hoses only, I can do rear hoses only, or I can do enough pieces to do them all.

My feeling is that if one is leaking.....more are going to leak and supplying a complete kit is the way to do this.....also makes "our job" a bit easier....one fits all. Plus the complete "kit" to do all the hose will be about 1/2 the price of the cheapest line that Porsche supplied....when they were available. How can the customer go wrong?

 

Thanks for the input, Greg. My Aeroquip lines worked great on the front and have not leaked, so I did the same on the rears while I was changing the trans mounts. If they do leak again I will be calling you for a kit also. It appears Kevin 2012 is overseas and may have trouble sourcing good hardware so your kit would be the hot set up!

Kevin

 

I bought the lower front transmission line for my 81 about 2 months ago. But it cost me $95 so your kit would be greatly appreciated.

 

It appears you are assuming Greg's hose is cheaper; that may not be the case, so be prepared. I've purchased other replacement hoses from Greg. He ain't cheap, but you can rest assured they are quality and all issues have been thought through.

 

Thanks for the kind words.

Anyway you do this, bulk hose and clamps, for all the automatic transmission hoses, is cheaper than any single hose I make for fuel applications. Those custom made German forged metric hose ends, for Teflon hose are expensive.....for the fuel application.

 

And I get to sell even more of Greg's great products 8>)