Group 4 - Lawn Mower Engine

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This is Group 4's final presentation of our dissasembly project. Our group was assigned a Lawn Mower Engine, and this project consisted of five required deliverable gates, as listed at the bottom of this page. The 5th gate consisted of a final Wikipedia page such as this. Our group members are listed below, and with this are the jobs and tasks that each person was assigned to do. Our Management and Project Plans are listed on this page for easy access, and this information can also be found via the link in Gate 1. Throughout the navigation of this site, information can be found as to what tools were used, how difficult each component was to dissasemble, recommended design revisions, as well as other various pieces of information. We hope that you find this information well suitable to your needs.

Executive Summary

This is an overview for what can be expected to be found in each of the subsections on this Wikipedia page.

Gate 1 (Request for Proposal)- Initial Product Assessment: this includes whether or not the product is in a feasible working condition, and also what the different functions and platforms of the product are.

Gate 2 (Preliminary Project Review)- Corrections to the Management Plan and Work Plan, and the Dissasembly Process. This includes a chart with a difficulty rating as to how hard each process was, along with the tool selection for that particular dissaembly step. Also included is a video showing the piston for our motor in motion.

Gate 3 (Coordination Review)- A summary of each component comprising the engine, viable Design Revisions, CAD Solid Modeled Assembly for selected components, and an included Engineering Analysis problem based on the physics of the rip cord system.

Gate 4 (Critical Project Review)-Chart included of the reassembly process, and additional recommendations for the manufacturer of this Lawn Mower Engine.

Management Plan

Our group plans to meet on a regular basis with specific objectives in mind each meeting. We plan to meet Mondays and Wednesdays, after class lecture at 5:00PM, in the project lab (Furnas 621). If needed, we will also meet on Thursdays in this same location at 3:30PM to finish what was not completed at the previous meetings. We can be contacted about our progress through the group manager’s email, The group positions are as follows: Jessie Allen is the Project Manager, Sean Lyons is the Communication Liaison, Bhushan Karayilthekkoot is the Solid Modeling Expert, and Tom Schuler is the Wiki Expert. A table of our intended work timeline and position responsibilities outline are given below:

Along with these individual group tasks, each member is expected to contribute to the project write-ups as a whole to distribute work fairly and evenly.

Meeting Date..............Goals

10/12--------------------------Product Dissection

10/14--------------------------Product Dissection

10/19--------------------------Product Dissection

10/21--------------------------Product Dissection

10/26--------------------------Product Dissection

10/28--------------------------Product Dissection Write-up

11/2----------------------------Component Summary

11/4----------------------------Design Revisions

11/9----------------------------Solid Modeled Assembly

11/11--------------------------Engineering Analysis

11/16--------------------------Coordination Review

11/18--------------------------Coordination Review

11/23--------------------------Coordination Review

11/25--------------------------Coordination Review

11/30--------------------------Product Reassembly

12/2----------------------------Product Reassembly

12/7----------------------------Final Report

12/9----------------------------Final Report

Group Members

Jessie Allen - Project Manager: - Set goals for each meeting and see that they are accomplished. - Divide work among each member each meeting. - Manage meeting work time

Sean Lyons - Communication Liaison: - Email members meeting times and goals. - Organize group work into reports.

Bhushan Karayilthekkoot - Solid Modeling Expert: - Perform solid modeling tasks.

Tom Schuler - Wiki Expert: - Publish group work to the internet on our wiki page and manage it.

Bob Belko - Disassembling/Assembling Expert: - In charge of Disassembling/Assembling the lawn mower engine.

Lawn Mower Engine

ADSC00160.jpg ADSC00161.jpg
(A) (B)

Fig 1: (A) The top of the lawn mower engine; & (B) the same engine at a different view

Work Plan

After the group’s first assessment of the lawn mower engine, we believe that disassembly process should run fairly smoothly. Judging from the mower engine’s external condition and the ability to hear compression in the engine, we concluded the engine is most likely fully functional. We estimate that the engine disassembly process should take between one to two hours. This is merely an estimate. Any unexpected discrepancies with the engine disassembly could possibly delay completion of dissection. This would include, but not limited to, remembering where all of the smaller parts for the motor itself go. Evaluating the machine from the outside and using the group’s knowledge of small internal combustion engines, we compiled a list of tools that will be required for the dissection process. Tools not on the list may be needed once the dissection begins and/or during reassembly.

Tool list:

1. Phillips head screwdriver

2. flat head screwdriver

3. standard wrench set

4. spark plug socket

5. standard socket set

6. needle nose pliers

7. pliers

8. standard Allen wrench set

9. piston ring puller

10. rubber mallet

As a group, we are confident that our combined experiences and abilities will be able to effectively dismantle the lawn mower engine. All the members of the group have great leadership skills and work well together. We have specialist in 3-D modeling. It is apparent that most of the group has a basic knowledge of small internal combustion engines. One challenge that we feel the group will have to overcome is the use of the wiki page. The group members lack experience with wiki webpage development.

Disassembly approach:

1. Remove gas tank

2. Remove carburetor assembly

3. Remove starter assembly

4. Remove cylinder head

5. Remove crank case cover

6. Remove cam shaft assembly

7. Remove valves

8. Remove piston

9. Remove piston rings

While removing these components, our group will be cataloging and taking pictures of every component to reinsure easy reassembly, and also measuring these said components to make realistic drawings in CAD modeling.

Gate 1

The link below leads to group 4's gate 1.

Gate 1 for group 4

Gate 2

The link below leads to group 4's gate 2.

Gate 2 for Group 4

Gate 3

The link below leads to group 4's gate 3.

Gate 3 for Group 4

Gate 4

The link below leads to group 4's gate 4.

Gate 4 for Group 4