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Transmission Input Shaft Seal Replacement
 
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Pelican Technical Article:

Transmission Input Shaft Seal Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$4 to $15

Talent:

**

Tools:

Pick, right size and length of PVC or pipe, floor jack, jack stands, wheel chocks, safety glasses, lug wrench, torque wrench, transmission jack and/or a helper

Applicable Models:

Porsche 944 (1983-89)
Porsche 944 S2 (1989-91)
Porsche 944 Turbo (1986-89)
Porsche 944S (1987-88)

Parts Required:

Seal

Hot Tip:

Do not seat the seal too deep

Performance Gain:

Proper transmission operation

Complementary Modification:

Check CV joints

Replacing the main shaft seal on the Porsche 944 and 951 transaxle is an easy job; unfortunately the transaxle needs to come out to do it. Removing the transaxle is a little more complicated. If you are considering replacing the main shaft seal please see our article on transaxle removal. You will need to perform that work first. The transaxle is not difficult to remove but it does involve a bit of time and you should have a friend to help if you have never done it before.

You will need to have the transaxle out of the vehicle to perform this work.
Figure 1

You will need to have the transaxle out of the vehicle to perform this work. Please see our article on transaxle removal for additional assistance.

When you remove the transaxle the coupler will be on the main shaft of the transaxle.
Figure 2

When you remove the transaxle the coupler will be on the main shaft of the transaxle. Pull the coupler straight off (red arrow). These can get corroded over the years so you can spray penetrating oil on it if needed.

You will need to remove the old seal without scratching the shaft or the housing (red arrow).
Figure 3

You will need to remove the old seal without scratching the shaft or the housing (red arrow). You can use a pick or screw a screw into the seal and pull it out of the way.

When installing the new seal make sure that the lip side faces the inside of the transaxle and that the flat side of the seal (shown) is facing outwards.
Figure 4

When installing the new seal make sure that the lip side faces the inside of the transaxle and that the flat side of the seal (shown) is facing outwards.

Use a long piece of pipe or PVC that has the same diameter as the outside of the seal, and gently push the seal in place.
Figure 5

Use a long piece of pipe or PVC that has the same diameter as the outside of the seal, and gently push the seal in place. NOTE: you can push the seal completely into the transaxle case if you are not careful. Make sure to apply even force and check the depth often.

There is a beveled edge on the housing (red arrows).
Figure 6

There is a beveled edge on the housing (red arrows). Make sure you only push the seal in until it passes the beveled edge and no more. Congratulations. The seal is set, and now all you have to do is reinstall the transaxle.

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Page last updated: Fri 12/9/2016 02:52:42 AM