derVorgänger - Porsche Club of America
derVorgänger - Porsche Club of America
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.