Group 7 - Lawn Mower Engine

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Contents

Tecumseh 3 H.P, 4-Stroke Lawn Mower Engine: Model Number TNT100

Introduction

A Tecumseh 3 H.P, 4-Stroke Lawn Mower Engine was dissected by Group 7, consisting of:

  • Christopher Germain- Lead C.A.D. Designer and Modeling Representative
  • Colton Steiner- Communications Diplomat and Project Adviser
  • Gregory Muench- Technical Expert and Dissection Executive
  • Julia Perot- Editor in Chief

Executive Summary

Group 7 dissected a small four-stroke Tecumseh lawnmower engine. Operation of the engine begins with the pull start, which turns the flywheel. When it is spinning, the magnetic plate in the flywheel generates current through the electromagnet, which passes to the spark plug. This creates an arc across the spark plug’s gap, igniting the compressed fuel/air mixture inside the engine. The explosion moves the piston, which rotates the crankshaft. A gear on the crankshaft engages with the camshaft, which turns the mower blades.

The group received the engine broken and was not able to fix it, though it is in better condition than when we started. Initially, there were portions of the throttle assembly and a key shoved in to the engine instead of being assembled in their correct places (see Fig 1.9b). There were quite a few cracks and broken pieces, including on the flywheel head and the cylinder head. The starter did not engage. Although it has been reassembled better than it was received, the engine will never be able to run because it has too many broken pieces.

This engine has quite a few components with varying degrees of complexity (see Component Summary). A detailed model of the piston can be seen in the Solid Modeled Assembly section of the Coordination Review.

Request for Proposal

Request for Proposal

Page Contents

  • Initial Product Assessment
  • Management Proposal
  • Work Proposal
  • Evaluation
  • Dissection Tools

Preliminary Design Review

Preliminary Design Review

Page Contents

  • Product Disassembly
  • Causes for Corrective Action

Product Analysis/Coordination Review

Coordination Review

Page Contents

  • Causes For Corrective Action
  • Component Summary
  • Design Revisions
  • Solid Modeled Assembly
  • Engineering Analysis

Critical Design Review

Critical Design Review

Page Contents

  • Reassembly Procedure
  • Product Status