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derVorgänger - Porsche Club of America

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DIY: How to drain and refill transmission oil<br />

Always loosen the drain<br />

fill bolt (top, arrow) BE-<br />

FORE loosening/removing<br />

the drain bolt to<br />

ensure that you can refill<br />

the transmission after<br />

you’ve drained the old oil.<br />

One tip is to clean the<br />

allen-head bolt sockets<br />

thoroughly beforehand,<br />

using a dental pick, brake<br />

cleaner, compressed air,<br />

etc., and ensure the allenhead<br />

is completely seated<br />

in the socket.<br />

8• der Vorgänger • October 2009<br />

Photo and story by Steve Vetter<br />

for der Vorgänger<br />

One <strong>of</strong> the easiest projects you can do on your<br />

<strong>Porsche</strong> is to flush the transmission fluid. It can be a<br />

messy job, but it’s not technically complicated. The<br />

photo above is from my 1990 944S2. You will need a<br />

17mm Allen socket (I bought a set <strong>of</strong> three at AutoZone),<br />

a drain pan, paper towels, possibly a socket extension to<br />

clear the muffler and a pump or other way to get the fluid<br />

into the transmission.<br />

The following steps are involved in replacing the fluid:<br />

1. Drive the car to warm up the fluid already in the<br />

transmission; this will help it to flow easier when the plug<br />

is removed.<br />

2. Jack the car up and remember that anything you<br />

touch is going to be hot.<br />

Fill plug<br />

Drain plug<br />

3. Loosen the top fill plug (see arrow). If you cannot<br />

remove it, stop! Nothing would be worse than draining<br />

all the fluid without a way to refill it. If you can’t get it out,<br />

take your car to one <strong>of</strong> dV’s advertiser’s shops.<br />

4. Assuming step No. 3 was successful, loosen the<br />

bottom plug (see wrench in photo) and prepare to catch<br />

the oil.<br />

5. Clean the bottom plug, looking for gear teeth and<br />

other evidence <strong>of</strong> a needed rebuild. Replace the plug.<br />

6. Fill the transmission with the fluid <strong>of</strong> your choice<br />

via the fill hole. I used a small hand-held pump that attached<br />

to the jug <strong>of</strong> fluid. (Remember, the fluid is thick<br />

and cold. I did this project on a hot day and left the jug<br />

in the driveway to warm up. Another trick is to set it in a<br />

bucket <strong>of</strong> hot water.) Pump the fluid in until it dribbles<br />

out the fill hole.<br />

7. Replace fill plug. Clean up and return all tools to<br />

the tool box.

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