Project Description

Pilot Bushing

  • Clutch pilot bearings sleeve bushing ISO 9001: 2015 Certified
  • Automobile Pilot Bushing
  • Customizable and free design

HIGH QUALITY & MAINTENANCE-FREE

Pilot Bushing | Advanced Clutch Technology

  • High hardness, wear-resistance, and fully comply with EU ROHS standards. Can provide spectrometer composition test, strength test.

     

  • High hardness, wear-resistance, and fully comply with EU ROHS standards. Can provide spectrometer composition test, strength test.

     

  • High hardness, wear-resistance, and fully comply with EU ROHS standards. Can provide spectrometer composition test, strength test.

     

pilot bushing

What Is a Pilot Bushing?

A pilot bushing also referred to as a transmission pilot bushing, is one of the most important parts of an automobile clutch.

The pilot bushing is seldom thought of as a part of the clutch system but it is one of the most vital parts of the system. The pilot bushing is only functional when the clutch is disengaged but it is a factor in input gear alignment at ALL times.

Most people have no idea what an important part the pilot bushing plays in the life of the transmission and clutch. The job of the pilot bushing is to support the end of the transmission input (main drive) gear in the crankshaft and it only acts as a bushing when the flexplate is depressed. This pilot bushing should be a light drive fit into the crank bore.

Types Of Pilot Bushings/Bearings

“Good” pilot bushings are an oilite made of sintered bronze.
A “good” pilot bushing is an oilite. Oil is put into the sintered bronze material under a vacuum- an impossibility w/non sintered material- being as how a solid bronze part has no real porosity of any kind.

Predominately, these bushings are bronze alloys that are impregnated with an oil to arbor the pilot tip of a transmission input shaft. Some less common versions may use greased needle roller bearings (there is no real overall advantage to either style). Pilot bushings provide precise, lubricated alignment while the clutch disc is released. Failure to use the proper pilot bushing can severely damage the transmission.

Adding additional lube other than a slight amount as an installation aid isn’t recommended and will serve only to attract/collect debris coming from the clutch and clutch plate, dirt, etc. An oil-bearing material like oilite has all the lube it needs already incorporated into the material itself, anything additional is not needed.

shaft bearing
oilite bronze bushings

How Does Clutch Pilot Bushing Work?

The pilot bushing is positioned at the end of the engine’s crankshaft and helps support the opposite end of the transmission’s input shaft which is an important part of how the clutch works. Pilot bushing allows the input shaft to stop spinning so the car’s gears can be shifted. This pilot bushing bearing may not be included in some front-wheel-drive cars because the bell housing is shorter and the input shaft can be supported within the transmission and does not need the additional support from the pilot bearing.

How to Remove a Stuck Pilot Bushing or Pilot Bearing

1: Use A Pilot Bearing Removal Tool
The puller tool inserts into the ID of the pilot bushing or bearing and expands as the tool is tightened down, theoretically obtaining a good hold onto the bushing/bearing from its center. Then, the shaft is tightened, forcing the bushing/bearing out of the crankshaft bore.
2: Hydraulic Force
More often than not, this is our immediate go-to way of removing either a stuck pilot bushing or stuck pilot bearing. First, grab a wooden dowel, steel rod, or what we normally use, a pilot bushing/bearing alignment tool that tightly fits inside the ID of the pilot bushing/bearing. Then, fill the cavity behind the bushing/bearing with grease.
All you need to do is insert the dowel, rod, or tool into the bore of the pilot bushing/bearing and give it a firm rap with a hammer. The hydraulic action will force the bearing out easier than you’d expect. In extreme cases where the bushing/bearing shell is deep and the press-fit tolerance is on the right side, you may need to refill the cavity with grease once or twice before it comes out.
3: Cut And Chisel
We consider this a method of last resort when all else has failed. The reason is the potential for damage to the engine crankshaft. This method works equally well with either a bronze pilot bushing or a steel pilot bearing, but you do need to be extra careful with the bearing to ensure you don’t cut too deeply and damage the crankshaft.
Using a rotary cutting disc is the easiest way. Carefully cut a deep divot nearly the entire way through. It’s not necessary to cut all the way through, though, as this increases the potential for damage to the crankshaft.
Using a sharp, flat chisel, firmly strike the bushing or bearing shell. If you’ve cut deeply enough, the busing or bearing shell will crack, relieving the press-fit in the crankshaft bore.
Then it’s just a matter of removing the pilot bushing or bearing with your hands and reinstalling a new one.