**Setting Differential Backlash (updated) By Jose Sanchez :: Curriculum

Automotive General Services Technician Model

Units:

**Setting Differential Backlash (updated) By Jose Sanchez

Part of Unit: Transmissions and Drivetrains

Lesson Plan Overview / Details

This lesson is to instruct the students in the proper method of setting the differential backlash. When students arrive in class they will see the objectives for the day on the white board. The students will receive instruction on the proper way to set up the dial indicator with a demonstration for them to model. Students will view a video to train them in the proper techniques for adjusting the differential to correct for improper backlash. I will go over tool selection; 3/8 dr. socket set, 3/8 dr. ratchet, spanner wrench, dial indicator, dial caliper, torque wrench, brass drift and pry bar.

Lesson Time

1 class period: 180 Minutes

Standards

California Career and Technical Education Standards

California Academic Content Standards (Reinforced)

ELA.8.R.CAGT.2.5 Understand and explain the use of a complex mechanical device by following techn...3

Objectives and Goals

Students will be able to set up a dial indicator and measure differential backlash
Students will be able to perform necessary adjustments to correct differential backlash
Students will use proper and safe shop procedures

Activities in this Lesson

Clunk, Clunk - Hooks / Set
I will start a video from YouTube (see below) that shows what excessive backlash looks and sounds like. I will tap into prior experience by asking the students if they have ever witnessed this condition before.
- YouTube- diff backlash.flv [ Watch Video ] [ Download Original Video ] Clunk, Clunk Differential noises
Show "n" Tell - Demo / Modeling
For the demonstration, the students will watch as I set up the dial indicator and demonstrate the proper way to check backlash. When we get a base reading, we can decide whether we need to adjust the ring gear into or away from the pinion to correct for proper backlash. When all adjustments are made, all fasteners will be torqued to specifications and we will recheck backlash to verify no movment occurred during tightening.
"Diff"rent Strokes - Demo / Modeling
Students will pick any of the differentials available to perform the task. Students will then ID differential and aquire necessary technical information regarding adjustment of their particular differential, including all specifications needed. During this time I will be circulating around the shop area answering any necessary questions, giving insightful recommendations and pointing the students in the right direction.