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Oil Pump Seal Replacement
 
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Pelican Technical Article:

Oil Pump Seal Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$10 to $80

Talent:

**

Tools:

Flathead screwdriver, pick, diagonals

Applicable Models:

Porsche 944 Turbo (1986-89)

Parts Required:

New seal, gear, O-ring

Hot Tip:

Don't scratch the matting surfaces

Performance Gain:

Eliminate oil leaks

Complementary Modification:

New belts

The oil pump on the Porsche 944 is driven off a gear on the front of the motor that is powered by the crankshaft. This gear has both an O-ring and a seal and they do fail and leak over time. You have to remove both the timing and balance shaft belts to get access to the seals, so replacing the oil pump seal is a good idea anytime you have the belts off.

Begin by safely raising and supporting your vehicle as well as removing the lower pan. You will also need to perform the work for balance shaft and timing belt replacement before you can replace the oil pump seal. Please see our articles on those procedures before starting this work.

With the belts and shields off you can see the seal on the front of the crankshaft.
Figure 1

With the belts and shields off you can see the seal on the front of the crankshaft. 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 diagonals and gently pry the key out. Make sure to clean up any damage you do to the key with some sandpaper, a file or Emory cloth.

With the Woodruff key gone you can remove the washer that covers the gear and O-ring (red arrow).
Figure 2

With the Woodruff key gone you can remove the washer that covers the gear and O-ring (red arrow).

This photo illustrates the O-ring (red arrow), oil pump gear (yellow arrow) and the oil seal (green arrow).
Figure 3

This photo illustrates the O-ring (red arrow), oil pump gear (yellow arrow) and the oil seal (green arrow).

Use a small pick or other instrument to remove the O-ring (red arrow).
Figure 4

Use a small pick or other instrument to remove the O-ring (red arrow). Use care to make sure you do NOT scratch any of the mating surfaces.

Next, use the pick or a small flathead screwdriver and remove the seal (red arrow).
Figure 5

Next, use the pick or a small flathead screwdriver and remove the seal (red arrow). Lots of people will screw in a deck screw into the seal and then use that to pull the seal out. Our seal was so old and tired it almost fell out.

With the seal gone you can slide the oil pump gear off the crankshaft.
Figure 6

With the seal gone you can slide the oil pump gear off the crankshaft. Make sure the crank is clean and that you gently slide it until it slips off (red arrow)

Clean both surfaces well (red arrow).
Figure 7

Clean both surfaces well (red arrow). You can see the oil pump gears across from the crankshaft in this picture. Installation is the reverse of removal. Make sure to oil or put some assembly grease on the inner part of the seal and the O-ring so the friction from the spinning crank does not burn them up. Make sure the seal is installed flat. The seal will be slightly behind the front of the engine case when seated properly.


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