Delivering high amounts of torque at 0:18
Warning against the use of impact guns to deliver high torque at 0:58
Leverage discussion and examples at 1:15
High torque ratchets at 2:10
Ratchet handle changing at 2:35
4:1 Torque multiplier introduction at 3:20
Caution label at 4:13
10-20 percent loss at 4:40
The planetary gear set in the head at 5:30
Torque multiplier setup at 5:42
Four times easier than without torque multiplier at 6:24
Weber State University (WSU) – Department of Automotive Technology – Ardell Brown Technology Wing – Transmission Lab.
This is part of a series of videos on Precision Measurements and tool care – Basic use and care of a Torque Multiplier.
This video helps cover content related to the 2017 National Automotive Technicians Education Foundation (NATEF) Required Supplemental Tasks – Tools and Equipment:
1. Identify tools and their usage in automotive applications.
2. Identify standard and metric designation.
3. Demonstrate safe handling and use of appropriate tools.
4. Demonstrate proper cleaning, storage, and maintenance of tools and equipment.
5. Demonstrate proper use of precision measuring tools (i.e. micrometer, dial indicator, dial-caliper).
This video is intended for students in my manual drivetrain and automatic transmissions classes as well as anyone who is interested in basic precision measurements.
This procedure is taught as part of our 2-year associated degree program. For more information on the Weber Automotive program, visit:
This video was created and edited by John D. Kelly at WSU. For a full biography, see
1. How do you speed up, or slow down, a Youtube video?
2. How much torque does a typical crush sleeve require to begin crushing?
3. Why should impact guns never be used on anything that contains a bearing?
4. Google the definition of bearing “Brinelling”, then describe bearing Brinelling in your own words.
5. What is the danger of putting a pipe on the end of a ratchet handle or breaker bar handle?
6. Under what conditions should a 3/4 inch drive ratchet and socket be used?
7. What is the advertised torque multiplication ratio of the torque multiplier shown in the video?
8. What is the actual torque multiplication ratio of the torque multiplier shown in the video?
9. What is the maximum output torque of the torque multiplier shown in this video?
10. How much input torque is required to reach the maximum output torque of the torque multiplier shown in this video?