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Lawn and Garden Motor Engine Replacement Guide

Lawnmower Maintenance

mower engine replacement guide

When the engine in an expensive tractor or lawn mower goes out, you can save money by replacing the motor instead of buying a brand new unit. If you want to replace your engine, you will need to know what engine is right for your equipment. Tractor Supply carries Briggs & Stratton, Honda and SpeeCo brand replacement engines for lawn tractors or other outdoor power equipment. Visit your local Tractor Supply Co. store to find out more about replacement engines.

How to Select an Engine Grade
When replacing an engine with the same brand of engine, such as replacing a Briggs & Stratton engine with another Briggs & Stratton, locate the original engine's model/type numbers on the model plate to assure the correct replacement.

Briggs & Stratton offers three distinct grades of engine, so you can match the engine's performance and cost to your specific application.

  • Vanguard™ OHV (overhead valve) engines are maximum-performance, cast-iron cylinder sleeve engines. Select for continuous heavy-duty applications.
  • Industrial Plus™ and IICO (industrial/commercial) engines are cast-iron cylinder sleeve, side valve engines. Select for medium-duty commercial, industrial and rental use.
  • Standard engines are aluminum cylinder bore, side valve engines. Select for general consumer use.

Engine Replacement Tips
If you are replacing a competitor's engine with a Briggs & Stratton engine, let features of the original engine plus the expected work cycle be a guide in selecting the correct replacement motor. Here are some things to consider:

  • Match the horsepower of the engine you are replacing as closely as possible. If you do not know the exact horsepower, that is okay. Most engines within a power range will have a similar bolt pattern for mounting the engine.
  • Compare overall engine size to determine if you will have problems mounting the replacement engine.
  • Check crankshaft orientation and size< to ensure proper fit. Briggs and Stratton provides a handy Crankshaft Measuring Template that you can use to take your measurements.

Horizontal Crankshaft Engines

  • Match crankshaft engine's diameter "A"
  • Height "B" (distance from base to crankshaft center line)
  • Length "C" (distance from oil seal/cover's mounting face to end of the crankshaft)
  • Match crankshaft type, e.g., key-way, tapered or threaded
  • Match crankcase cover's tapped holes for mounting accessories (if applicable)
  • Match base mounting dimensions/bolt holes spacing

Vertical crankshaft engines

  • Match starter type and starter grip position "A".
  • Match crankshaft's diameter "B"
  • Keyway type "C"
  • Length "D" (distance from mounting face of sump - not oil seal - to end of crankshaft)
  • Match mounting base of dimensions and bolt holes spacing

Replacement Engine Safety
For many safe hours of operation, it is important to maintain the original engine's same horsepower, starter type and position, fuel tank location, fuel line routing, muffler location, exhaust direction and muffler accessories (e.g., deflector, spark arrestor, etc.). Re-install all guards, shields and safety devices. Replace missing, worn or damaged parts.