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The Legend Continues

Makers of the world famous Atomic-4 and pioneers in premium marine diesel propulsion, Universal has struck again with its latest release, the Universal B-Series.

The B-Series is powered by the latest advancements include cleaner emissions, reduced noise levels, and increased horsepower at lower RPMs.  All B-Series engines are naturally aspirated and deliver high low-end torque.  All of which produce some of the most quiet and durable marine engines currently available.

If you're looking to replace that aging Atomic-4, the Universal B-Series is still the boaters choice for Atomic-4 replacements*.  The M3-20B, M-25XPB, M-35B, and M-40B offer many similar dimensional characteristics to the Atomic-4, making for a much easier installation.  The M-50B is a suggested replacement for the aging Westerbeke Four-99, Four-107, Four-108, W-40, W-46, and W-50 engines now in service.

Marine Diesel Direct holds a large inventory of spare parts for your engine including easy to buy spare parts kits and gasket sets tailored to your particular engine.  When you think Universal think Marine Diesel Direct

For a sailboat engine price quote, please fill out our quote form.  Responses can be expected within 48 hours.

*Universal Atomic-4 replacements are not direct drop-ins in all cases.  Some engine compartment  reconfiguration may be required

 
Current Models Standard Transmission Cylinders Cubic Inch Horsepower
M3-20B Reduction Drive
2.05:1
3 44 20
M-25XPB Reduction Drive
2.05:1
3 61 26
M-35B Reduction Drive
1.79:1
4 81 35
M-40B HBW 100 2:1 4 91 37.5
M-50B HBW 150 1.88:1 4 113 42
 

Engine Dimensions*

Overall Width Overall Length Overall Height Adjustable Mount Centers
M3-20B
241 lbs
18.8 26.4 18.9 16,14.5 or 11.5
M-25XPB
295 lbs
18.8 28.4 21.4 16 or 11.5
M-35B
352 lbs
18.8 32.7 21.4 16 or 11.5
M-40B
356 lbs
18.8 33.2 21.4 16 or 11.5
M-50B
529 lbs
18.8 36.0 26.8 16

*dimensions are in inches and with the standard transmission installed

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Many Features Which Are Standard Equipment

  • Fresh water cooling
  • Engine pre-wired to plug-In connector
  • E-Z bleed fuel system
  • 12 volt, 51 ampere alternator
  • Coolant recovery tank
  • Throttle and shift control brackets
  • Low oil pressure alarm
  • High water temperature alarm
  • Gear driven sea water pump
  • Glow plug cold starting aid
  • Engine matched four point adjustable mounts
  • Lube oil drain hose
  • Circuit breaker protected electrical system
  • Operator's manual and parts list

Recommended Optional Panel:   The Admiral Panel

 

 

 
  • Tachometer with hour meter
  • Oil pressure gauge
  • Water temperature gauge
  • Volt meter
  • Preheat
  • Start button
  • Key switch
  • 15' wire harness
  • Alarm system
  • Senders