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Balance Shaft Seals Replacement
 
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Pelican Technical Article:

Balance Shaft Seals Replacement

Steve Vernon

Time:

5 hours5 hrs

Tab:

$6 to $110

Talent:

***

Tools:

Socket and wrench set, flywheel lock, flathead screwdriver, diagonal pliers

Applicable Models:

Porsche 944 Turbo (1986-89)

Parts Required:

New seals

Hot Tip:

Make sure engine is at Top Dead Center

Performance Gain:

Proper engine operation

Complementary Modification:

New belts

There are two balance shafts on the 944 motor, one on the upper left side and one on the lower right. Replacing the balance shaft seals can be an important part of your maintenance on your Porsche 944. Most people will reseal the front of the engine's gaskets including the oil pump gasket while replacing the water pump. The gaskets are not that expensive and considered good maintenance while everything is apart. If the balance shaft is leaking from the rear seal you will need to remove the entire balance shaft and housing to fix it. This is covered in a separate article due to the large amount of extra work required especially on a turbo motor. Even if you do not need to replace the belts they will need to come off to perform a seal replacement. If you are removing the belts and going to reinstall them make sure to mark the direction of rotation and do not turn it reinstall it inside out.

You are going to need to safely raise and support the vehicle and remove the under engine tray. Please see our article on safely raising and supporting your Porsche 944 as well as removing the under engine tray.

You will also need to perform the work for balance shaft and timing belt replacement before replacing the seals. Please see our articles on those procedures before starting this work.

This photo illustrates the front of the upper left balance shaft.
Figure 1

This photo illustrates the front of the upper left balance shaft. These tend to leak around the front seal (red arrow) and sometimes from the large O-ring at the base of the mount.

You will need to remove the Woodruff key from the balance shaft (red arrow).
Figure 2

You will need to remove the Woodruff key from the balance shaft (red arrow). I have found the best way to do this is to use a set of diagonal pliers and gently pry the key out.

Make sure to clean up any damage you do to the key (red arrow) with some sandpaper file or Emory cloth.
Figure 3

Make sure to clean up any damage you do to the key (red arrow) with some sandpaper file or Emory cloth.

With the Woodruff key removed use a 13mm socket and remove the three bolts holding the mount to the block (red arrows).
Figure 4

With the Woodruff key removed use a 13mm socket and remove the three bolts holding the mount to the block (red arrows).

There are two pry points on the rear of the mount that you can use to get the mount separated from the block.
Figure 5

There are two pry points on the rear of the mount that you can use to get the mount separated from the block. Pull the mount (red arrow) of the balance shaft (yellow arrow).

There is a very thin gasket behind the flange on the front of the shaft (red arrow).
Figure 6

There is a very thin gasket behind the flange on the front of the shaft (red arrow). This gasket will sometimes stay on the shaft when you pull the mount, flange and seal off. Remember to remove it before installation.

Always replace the large O-ring at the rear of the mount (red arrow).
Figure 7

Always replace the large O-ring at the rear of the mount (red arrow).

Use a screwdriver or other tool to remove the front gasket/seal (red arrow) from the mount and around the flange.
Figure 8

Use a screwdriver or other tool to remove the front gasket/seal (red arrow) from the mount and around the flange. Make sure you do NOT scratch the inside of the mount or the flange or this will lead to a leak.

With the gasket off you can remove the flange (red arrow) from the mount.
Figure 9

With the gasket off you can remove the flange (red arrow) from the mount. Clean everything up and installation is in the reverse order of removal. You will need to install the mount first, then the very thin gasket, then the flange and then the gasket or oil seal on the front.

Find a socket that fits over the flange and shaft that you can use to evenly install the seal (red arrow).
Figure 10

Find a socket that fits over the flange and shaft that you can use to evenly install the seal (red arrow). Use care not to damage or bend the seal during installation or you will just end up needing to replace it again.

The lower balance shaft is similar with the difference being that the mount also contains the mount for the power steering pump and tensioner and idler for the belt, but it is still held in place by three 13mm bolts.
Figure 11

The lower balance shaft is similar with the difference being that the mount also contains the mount for the power steering pump and tensioner and idler for the belt, but it is still held in place by three 13mm bolts. Also the oil seal or gasket is different in size from the upper seal by 1mm so make sure you do NOT install the wrong seals.


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