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Pilot Bearing Replacement
 
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Pelican Technical Article:

Pilot Bearing Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$8 to $35

Talent:

**

Tools:

Homemade slide hammer with nut and bolt, socket to seat the bearing, floor jack, jack stands, wheel chocks, safety glasses, torque wrench

Applicable Models:

Porsche 944 Turbo (1986-89)

Parts Required:

Pilot bearing

Hot Tip:

Freeze the bearing before installation

Performance Gain:

No clutch shaft noise

Complementary Modification:

Resurface the flywheel

The pilot bearing itself is relatively easy to replace, especially considering the amount of work you need to perform just to get access to it. While not a lot of people will go to all the trouble to perform a clutch removal just to change out the pilot bearing, it is definitely something you want to replace "while you're in there" doing a clutch job. The bearing is not expensive and should be considered part of any clutch job.

You will need to perform all the work required in a clutch replacement job to get access to the pilot bearing. Please see our article on clutch replacement for all the additional information.

Before you begin place the new bearing in the freezer to contract it and make installation a little easier.

Even though you will be able to see the bearing through the opening in the clutch you will need to remove the clutch and pressure plate (red arrow) to replace the pilot bearing.
Figure 1

Even though you will be able to see the bearing through the opening in the clutch you will need to remove the clutch and pressure plate (red arrow) to replace the pilot bearing.

The pilot bearing sits in the middle of the flywheel.
Figure 2

The pilot bearing sits in the middle of the flywheel. It is the bearing that supports the end of the torque shaft to the crankshaft (red arrow). You do NOT need to remove the flywheel to replace this bearing.

You will want to make your own slide hammer.
Figure 3

You will want to make your own slide hammer. Start with a long bolt with a head or nut on it that will fit inside the opening for the pilot bearing (yellow arrow). You will want the bolt long enough so you can slide vice grips or a box wrench down it and use the force (red arrow) as a slide hammer to remove the old bearing.

Insert the bolt through the opening and hold it against the inside of the bearing (red arrow).
Figure 4

Insert the bolt through the opening and hold it against the inside of the bearing (red arrow). Use your wrench or vise grips to slide down and pull the bearing out. You will need to constantly reposition the bolt so that you end up pulling the bearing out evenly.

Freeze the new bearing overnight to help it contract.
Figure 5

Freeze the new bearing overnight to help it contract. This will make installation easier. You do not want to lubricate the outside of the bearing. Make sure you dry seat it.

Use a socket that has the same outside diameter (red arrow) as the new bearing and gently tap it evenly into the opening.
Figure 6

Use a socket that has the same outside diameter (red arrow) as the new bearing and gently tap it evenly into the opening.

The new bearing is installed when it sits flush to the mounting surface (red arrow).
Figure 7

The new bearing is installed when it sits flush to the mounting surface (red arrow). Now all you have to do is reinstall everything.

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Page last updated: Wed 12/7/2016 02:53:55 AM