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911 SHIFT ROD SEAL REPLACEMENT
By Steve Grosekemper
Oil leaks are part of owning a 911. Whether we like to admit it or not these are things we must live with and deal with. Some oil leaks are easy to fix some are not so easy. One oil leak that is truly
an unwelcome one is the shift rod seal. The main problem with the failure of this seal is that when it leaks, the fluid is with you inside the car, not outside on the ground. For those of you who
have never had the experience of smelling well-used gear oil inside your car lets just say it is very unpleasant, as well as very lingering.
The first step is to determine if you actually have a leaking seal. To do this you must remove the inspection cover from the rear of the tunnel. Then pull back the two shift coupler boots and
disconnect the coupler by removing the 4mm Allen bolt. After the boots and coupler are out of the way any leaks should be obvious. (See figure #1)
The replacement of this seal in the car can be quite tricky, unless you know about the Special installation tool.
This tool is used to evenly insert and recess the seal into the transmission housing without damaging seal or transmission. The special tool can be purchased from any Porsche shop, as it is actually a spacer for a late model chain tensioner on earlier cars, slightly modified of course. To make one of these special tools you must take a spacer (930.105.185.00) and machine one end. It must have 1.5mm of height and 5mm of diameter removed. (See figure #2-before and after)
After you have determined that you do indeed have a leak and the tool has been made, you will be ready for your seal replacement adventure.
-Safely raise the car.
-Drain the transmission fluid.
-Use a tiny seal removal tool to remove the seal. (A.k.a. long skinny screwdriver)
This is the most important step due to the fact that if you scratch the inside of the transmission housing while removing the seal you will have a permanent seal leak!
-Wipe the shift rod and transmission housing clean and slide on a new seal.
(Part #999.113.085.00)
-Slide the special tool over the shift rod and press the seal all the way into the transmission housing using two screwdrivers. (See figure #3)
-Reinstall the shift boots and coupler.(Shift adjustment will not change)
-Reinstall the inspection cover and refill the transmission with fresh fluid.
The cost for both the seal and spacer/tool should be less than $20.00.
Good Luck!
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