Lesson Plan Industry Sector
Agriculture & Natural Resources

## Small Engine Nomenclature

### Lesson Plan Overview / Details

Find and identify the engines specifications and physical characteristics by using the model, type, and code

### Lesson Time

Discussion/Lecture/Lab
2 Hours

### Objectives and Goals

• Students will locate the number on Briggs and Stratton engines that will tell the owner the model, type and code.
• Students will learn how to use the Briggs and Stratton repair manual to look up information to determine mechanical characteristics of the engine

### Activities in this Lesson

• Whats in a number - Hooks / Set

List items on the board that use a number to indicate a characteristic of the item (i.e. F-150, K-2500, Ram 3500, CR 250, YZ 125, KX 250). Have students take out a piece of paper and write down what they think the items that are listed on the board identify? Give them 1-minute to write down their answers. Check for answers by picking a student and then have that student pick a student to give the answer. Do this until you have all six answers. Now pull up the power point and discuss what the model tells us about the item (i.e. trim package - King/Sierra/Silverado, capacity - tons, engine size c.c.. Use the power point to give students a visual as you describe this concept.  What does this have to do with small engines? Briggs and Stratton identifies their engines using a model type and code numerical system.  Today we are going to explore how this will help us find characteristics of the engine we are working on, along with the illustrated parts list to help us take the engine apart and identify the parts the make up the engine.

• Pictures of items listed on the board [ Download ] Use power point to help describe differences in items based on their model
• It's time to locate the numbers. Use the power point to show the students the location for most of Briggs and Stratton lawn care equipment. It is important to tell the students that Lawnmowers and other pieces of equipment have a model number that is separate from the engine number which can be found on the cylinder shield, blower housing, valve cover etc. Also Briggs and Stratton engines are used on other companies equipment (OSH and Craftsman brands). NOTE: if you do not have engines in your lab make this a take home assignment where the kids go home and find the numbers on their at home piece of equipment or they might have to go to the local hardware store but they should be able to find a piece of equipment that has the number.

• Assign students to a work station (Note my shop is set up with an L-Head and OHV engine below each work station and I assign two students to a station) Have students get lined paper and pencil before you release them to go into the shop. Students are to find the Model, Type, and Code located on the L-Head engine (This is the engine I have the students disassemble first. This activity will be dependent on your resources if you don't have enough engines then assign a group to what ever engines you can acquire also if all you have is Overhead engines you can use those. I do this because the intent of the lesson is to have students download their illustrated parts manual prior to disassembling the engine that is at their workstation) NOTE - Make sure every student comes back into the classroom with the required #'s

• Know it is time to break down the numbers have power point on Slide 1. Using the power point have the students take notes.
The Model number gives important mechanical features of the engine
- 1st - one or two digits (Slide #2) indicates the Cubic Inch Displacement
- 1st digit after Displacement (Slide #3) indicates the Basic Design Series (This relates to the cylinder construction, ignition, or other major differences)
- 2nd digit after Displacement (Slide #4) indicates the Position of the Crankshaft, Type of Carburetor, and Governor (If applicable)
- 3rd digit after Displacement (Slide #5) indicates the Type of Bearing on PTO, Reduction Gear (if applicable), Auxiliary PTO/Drive (if applicable), Pressure Lubrication (if applicable)
- 4th digit after Displacement (Slide #6) indicates the Type of Starter, Charging System (if applicable)
The Type number (Slide #7) Identifies the engines mechanical parts, color of paint, decals, governed speed, and OEM (Original Equipment Manufacturer)
The Code number tells the owner the manufacturing date
- 1st and 2nd digit (Slide #8) = The year the engine was built
- 3rd and 4th digit (Slide #9) = The month the engine was built
- 5th and 6th digit (Slide #10) = The day of the month the engine was manufactured.
Located after these 6 digits will be two more digits that is a combination of a letter and number indicating the assembly line and manufacturing plant (Why is this important to the owner?) If there is a recall on the engine or a warranty issue that is occurring with a particular engine developed on a certain date it can be traced back to the assembly line & plant.
Go to the last slide (slide #11) I have used this slide to indicate a date of significance to the United States you can change this to match whatever you want the the students can connect with to see if they know how to read it (Self Check and understanding)

• Small Engine Nomenclature [ Download ] Use power point to reinforce your lecture/discussion
• Have students get a Single Cylinder L-Head Repair Manual and look at the Table of Contents located in the front of the book. We know from the power point that the Model # gives us more information but where do we go to find what the numbers stand for (i.e. crankshaft position, carburetor, starter etc.). Since this information is considered General Information find that section in the Table of Contents and look in that section (Note - point out to the students that each section also includes a Table of Contents for that section). If you do not have access to this manual I have included a copy of that page for the L-Head and the OHV). Write on the board a Model # based on another L-Head engine (NOTE - do not use the one the students wrote down during the lab activity. You will have the students use this number for guided practice after you finish modeling the activity. Realize if all you have is Overhead Valve engines you can still do this lesson because it applies to all Briggs and Stratton engines). Write the number on the board. Have the students use the backside of their lined paper to write the example down. Review the B&S Repair Manual the middle of the page is broke into columns (A-E) Have students follow along as you write it on the board tell them to use a seperate line for each item.
- Column A (one item) = 1st one or two digits and
- Column B (one item)= 1st digit after displacement will use whatever the # is it will be the answer.
- Column C (three items)= 2nd digit after displacement find the number in the column and write down the answers for the crank, carb., and governor (if applicable).
- Column D (four items)= 3rd digit after displacement find the number in the column and write down the answers for the bearing, reduction gear, aux. pto, lube.
- Column E (two items)= 4th digit after displacement find the number in the column and write down the answers for the starter, charge system). When you finish ask the kids how many lines they used Know it is there turn using the number they got in the lab.

• B & S Repair Manual for L-Heads [ Download ]
• Using the number acquired in the lab students will demonstrate that they understand the
process. Students will flip their paper back over to their Model Type and Code
# and decode the numbers so they know the mechanical features of their engine
(Model #) and the date the engine was built (Code #). Once they are checked for correctness they are ready to complete the work sheet assessment.

### Assessment

Assessment Types:
Demonstrations, Work Sheet,

Students will use the number (Model, Type, and Code) they acquired from their engine (whether it be one from the schools lab or one from home) use the Repair Manual or copy of the page out of the manual to access the Briggs and Stratton Identification system to determine mechanical parts and date manufactured

Once students have successfully completed this, have them complete the worksheet.  This can be done as a take home assignment or start it during class for them to take home and finish so if they still need assistance you are there for them.

• B & S Identification Work Sheet [ Download ] Completed in class or as a take home assignment