Mack Boring & Parts Company


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News & Updates

Diesel Engine Seminar preps sailor for 10 years of "what-ifs"
Sailor, Devin Taylor, preps for 10 years of “what-ifs” by attending Mack Boring's diesel maintenance seminar before setting sail for his 10-year voyage around the world.

Hinckley Picnic Boat repowered with Yanmar 8LV diesel engines "It's the best performing picnic boat ever...they got it right."
Jason Smith
Owner, Boat Yard Services

Yanmar engines and Aquadrive anti-vibration systems are a perfect pair. View photos of Yanmar/Aquadrive applications

World Class Service

Service after the sale is what separates Mack Boring from the competition.
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Recreational Marine


Free Yanmar Performance Reports

FREE REPOWER PERFORMANCE REPORTS

Yanmar is the first name in 9-900 HP Recreational Marine diesel power. Mack Boring & Parts Company has been a leading North American supplier of Yanmar marine diesel engines for over 30 years. Find out what it means to experience the power of the market's preferred diesel, supported by one of the most established and reliable diesel supply partners - anywhere.

Browse our full lineup of Yanmar Marine Diesel Engines

New Product Announcement: Yanmar 8LV Engine

Introducing Yanmar’s super-clean, high-performance, Tier 3 diesel engine.

Yanmar 8LV Engine
Yanmar 8LV Engine
(shown w/ optional sterndrive)

You will be astonished by the acceleration, top speed and fuel economy of Yanmar’s new 4.46L twin-turbo 8LV diesel engines. You’ll be just as impressed by the amazingly low noise levels and the smooth ride.

With the renowned Yanmar qualities of performance, reliability and durability, the 8LV diesel engine is ideal for new boats and an excellent repower choice.

Efficient common rail, Tier 3 technology.
Less weight with more power.

  • 320 and 370HP models
  • Hundreds of pounds lighter than competing engines
  • Advanced electronic controls
  • Twin Turbo -- impressive torque through wide rpm range
  • Very quiet and smooth running
  • New full-featured VCS (Vessel Control System)
  • 180 amp alternator

Further information:
8LV-320 Product Detail
8LV-320Z Sterndrive Product Detail
8LV-370 Product Detail
8LV-370Z Sterndrive Product Detail

Product Spotlight: Yanmar BY Series Engines


Yanmar BY Series
The latest "powerful gem" from Yanmar, the BY series engine is perfect for your repower or new boat construction. A compact design featuring common rail injection and the best fuel economy in its class, the BY is the clear choice for your next marine propulsion project. The BY is 35% lighter than its competitors, available in both inboard and sterndrive packages and is backed by the best dealer support network in the industry.

See Technical Specifications:

4BY (4-Cylinder)

6BY (6-Cylinder)

Just some of the reasons to choose the BY:

  • Powerful and Efficient
  • Low Vibration and Low Noise
  • Easy and Low Maintenance
  • Light and Durable
  • Clean and Safe Engine Room
  • Compact Engine Dimensions
  • NMEA 2000 CAN-bus Technology
  • Lower Fuel Consumption
  • Meets Emission Regulations
  • Worldwide Support Network