Kahdmus

Anyone know of a good transmission fluid replacement tutorial? I have read the one on P-car but would like to see something more...

Thanks,

Bill Gregory

The article on P-Car pretty much nails it. With 3/4"? clear hose and a bottle of Mobil 1, you're just about there. Ensure you can loosen the bolt where you add the fluid before draining it. For more details, you could consult the Bentley manual for the 911SC or Carrera, as the filler and drain are both located in the same positions. Adrian's book may have additional details, too.

Kahdmus

Thanks Bill, dont have the bentley manual and couldnt find it in Adrians book (just the ATF emergency fill up and the recommended change intervals)

The hard part I think is locating the in and out bolts, if you take my meaning?! I couldnt get from the pcar pics where and at what angle the nuts were. Easy to find?

I am presuming this is an easy DIY?

Thanks

Bill Gregory

I think this is a pretty straight forward DIY project. The first picture in the p-car article is a good one, although I can see how the picture angle could leave one scratching their head. On the left/US drivers side of the transmission, there's only one allen hex plug. With long arms, you can 'almost' reach it from the wheel well with the left rear wheel removed. Ditto for underneath the transmission, I want to say there's only one drain plug (been awhile since I've been under there). The only caution I'd offer is by using the clear hose to add the fluid, keep track of how much you've put in, as excess will flow out the in-hole when you pull out the clear hose (assuming you use the procedure as described on P-Car). You could also use a hand pump to pump it in. When it drains out the filler hole, you're done. Torque both the filler and drain plugs to 22 ft lbs. New O rings (qty=2) are Porsche part number 900.123.011.30 (22x27).

garrett376

Hey Howard, it's an easy task compared to other stuff.

On the image below you'll see the drain plug. The Fill bolt is on the other side, as Bill said (left side). Get yourself a nice 10mm hex head with a long handle (I used my torque wrench with a 2 foot handle) to undo the fill plug first. Then crank off the single lower plug and let everything drain out. If your tranny is cold, I'd let it sit overnight to drain as much as possible.

I filled my tranny using Valvoline non-synthetic 75-90. I have a pump ($5 well spent!) that fits on the .9 liter bottles - I just layed under the car and pumped away. I kept pumping until the oil gets to the level of the filler, which means it will start to drip out. Then I seal it all off, and done! Quite easy.

The front differential is the exact same- remove the undertray cover, remove fill plug, drain plug, when empty put back the drain plug and fill, then seal with the fill plug!

The hard part is getting to the auto parts store with a ton of used oil, not getting it all over the inside of my crappy "parts" truck!

John D.

Hi Howard,

Yes - is a pretty simple DIY.. HOWEVER - UNDO THE FILL PLUG before loosening the drain plug - ummm, just in case....

Also, what I use to fill the tranny fluid is a 45 degree plastic "elbow" I cut off of a gas filler spout. Leave about 1.5" on each end on either side of the elbow, and on the larger end - use a hot glue gun to "glue" the spout to the screw on top of a tranny fluid plastic container, after removing the cap nozzle. You'll use this "filler spout" rather then the long plastic hose, and as Bill notes - as that can be messy....

To fill - take your homemade "tool", and put your thumb over the end of the cut-off spout. Next, turn the gear oil plastic jug over and raise the container up into the body cavity, slightly towards the rear. Next, insert the nozzle into the fill opening - and let her rip..

Presuming you did an entire drain - it's just about 4 quarts of new tranny fluid...

When I did this a few weeks ago on both the 964 and the 993 - I think I only spilled about 4 drops..

HTH,

John

garrett376

I tried at first using an allen wrench to remove the fill plug and bent the heck out of it... get a nice 10mm hex to fit a socket wrench!!!

John D.

Yep!!!! BTDT!!! We could trade Allen wrenches - and not know it..!!!!

Garrett is right - get the right tools..!!!!

Kahdmus

Thanks Fellas, some excellent, confidence inspiring advice here! :-) It seems the only way Kahdmus Syndrome could strike is if I take the drain out and then can't remove the filler...GOTTIT!

I HATE allen wrenches, I find they are highly likely to strip nuts (see my thread on tightening Aero mirrors) and never supply the necessary leverage!

JD - was that 4 quarts total front AND back for the C4?

Much appreciate the responses!

garrett376

1.27 quarts front diff, 4.02 quarts transmission!

That's what my manual says...

John D.

As Garrett said - get a 3/8" or 1/2" driver! If you do it with an "allen wrench" - I can add you to the "Rennlist Garrett/John Tool Club of bent stuff"..

No - rear only. It's slightly more then 4qts on a level surface....

The front differential... YOU WILL NEED THE RIGHT TOOLS!!! I'm guessing Porsche hired a Gorilla to tighten those fill/drain plugs - so use the right tools. On my 993 front - I thought the front end of the car was bending before the plugs came loose - and when they finally let go - the resonance through the car sounded worse then a B&B muffler at 3000 RPM

HTH!!!!

John

Tom W

Howard: I've done it before if you need/want assistance. Tomorrow is car day (993 this time) so I'll be around if you want to stop by.

Kahdmus

Thanks Tom that would be great. I'm going to take a look-see and try loosening the bolts in the am. If I CAN proceed I will. Otherwise, what times are you planning on being out in the garage? --H

garrett376

Glad to know that others share in the true joy of "doing it yourself!!!!"

Kahdmus

Thanks Garrett, I had checked my manual and bought 6 quarts of Mobil1 75W90 earlier today. It was stated with a comma however i.e. 1,27 and 4,02 rather than 1.27 and 4.02 so I just wanted to make sure!

Thanks guys!