Tech Tip #239: Twin Disc / WPT IBF314 Pilot Bearing Installation Made Easy

Dr. Diesel
Written by Dr. Diesel


Replacing an IBF314 PTO? Caution! This WPT / Twin Disc clutch is different!

Mechanical power takeoff clutches usually have a one piece pilot bearing that is pressed into the flywheel. In earlier Dr. Diesel™ Tech Tips (Tech Tip #67: How to Remove a Troublesome Pilot Bearing (Part 1),  Tech Tip #95: Removing a Troublesome Pilot Bearing (Part 2), and Tech Tip #158: Power Takeoff Clutch Maintenance: How to Remove a Troublesome Pilot Bearing (Part 3)) we wrote about pilot bearing installation and removal techniques.

IBF pilot bearings are a two piece bearing with a roller bearing and a removable inner race. To install them properly requires a different technique than the standard one piece pilot bearing used in other PTO models.


This Dr. Diesel™ Tech Tip focuses on how to install this two piece bearing on a WPT or Twin Disc IBF314 PTO.


If your PTO came with a split-type roller pilot bearing, please follow the steps below, while referring to the diagram.


  • Press the pilot bearing inner race on the end of the shaft, stopping when the bearing is flush with the shaft.
  • Measure the distance from the PTO bell housing face to the end of the bearing inner race.

Record this value, A: __________


  • Measure the width of the bearing outer race.

Record this value, B: __________


  • Subtract the value of step 3 from the value of step 2 (A-B=C). This is the distance the outer race needs to be installed from the engine bell housing face for proper alignment.

Record this value, C: __________


  • Install the outer pilot bearing race into the flywheel to the depth calculated in step 4. It is recommended to sign, date, and keep a copy of this for your records.

IBF Pilot Bearing Diagram

For more information, please take a look at WPT Power’s manual: Mechanical Power Takeoff Installation and Maintenance Manual 6” through 18”.


We hope that this Dr. Diesel™ Tech Tip has been helpful.


If you need other parts for your IBF314 Power Takeoff, check out our website store!


Dr. Diesel
Written by Dr. Diesel
Knowledge is power. Power to build ties to engine users. To build a relationship with our customers, we share with you our 105 years of knowledge in many ways. We have this special section called “Ask Dr. Diesel™” where you can pose questions about engines, transmissions, industrial hand clutches, exhaust scrubbers, etc.

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