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Main Content

Engine Replacement Guide

Follow the engine replacement guide below for easy re-powering of your outdoor power equipment including augers, mixers, tillers, edgers, mowers, lawn tractors, and more.

Re-powering guidelines
If replacing a Briggs & Stratton engine with a Briggs & Stratton engine, provide the original engine’s model and type numbers to assure the correct replacement. If replacing a competitor’s engine with a Briggs & Stratton engine, let the horsepower and features of the original engine plus the expected work cycle be a guide in selecting the correct replacement. Also consider these factors: Match the engine’s performance and cost to your specific application to get the optimum performance at an affordable price. That means better value for you.

  • 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 engine - select for medium duty commercial, industrial and rental use.
  • Standard engines are aluminum cylinder bore, side valve engines - select for general consumer use.

Not sure which replacement engine you’ll need?
To find the correct replacement engine, find the type of drive shaft you need. Just follow the guide below:
Horizontal engines - have the drive shaft on one side.

engine replacement guide image


Vertical engines - have the drive shaft on the bottom.

  • Gas with a Horizontal Shaft
  • Gas with a Vertical Shaft
  • Diesel with a Horizontal Shaft
  • Diesel with a Vertical Shaft

Try to determine the horsepower of the engine you are replacing. If you do not know the horsepower exactly, that’s OK since most engines within a power range have a similar pattern for the bolts that mount the engine. For example, most 3 to 5 H.P. engines have the same bolt pattern.

Other features to look for:

  • Muffler Direction
  • Fuel Tank size
  • Starter - Electric/Rewind
  • Alternator Rating

Horizontal Crankshaft Engines

  • Compare overall engine size for possible mounting interference
  • Match crankshaft’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 crankshaft)
  • Match crankshaft type, i.e., keyway, tapered or threaded
  • Match crankcase cover’s tapped holes for mounting accessories (if applicable)
  • Match base mounting dimensions and bolt holes spacing

Vertical Crankshaft Engines

  • Compare overall engine size for possible mounting interference
  • 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 dimensions and bolt holes spacing