Universal M3-20B Marine Diesel Engines | Ubiversal B-Series Diesel Engines | Universal Marine Engines | Universal Diesel Engines
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Universal M3-20B
Marine Diesel Engine

Universal M3-20B Marine Diesel Engine
Universal M3-20B
HP - 20
RPM - 3600
Displacement - 43.80 cu. in.
Cylinders - 3


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 in diesel engine design. Some of the benefits from these 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. This produces 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 offers many similar dimensional characteristics to the Atomic-4, making for a much easier installation.

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

Standard Equipment:

  • Fresh water cooling
  • Engine prewired to plug-in connector
  • E-Z bleed fuel system
  • 12 volt, 51 ampere alternator
  • Coolant recovery tank
  • Domestic hot water connection
  • Throttle and shift control brackets
  • Low oil pressure and high water temperature alarms
  • Gear-driven sea water pump
  • Transmission with 2.05:1 reduction
  • Glow plug cold starting aid
  • Engine matched four point adjustable mounts - fail safe neoprene
  • Mounting centers - 11.5", 16.0"
  • Lube oil drain hose
  • Oil fill - Top
  • Circuit breaker protected electrical system
  • Operator’s Manual and Parts List

Optional Equipment:

  • Captain panel with alarm (tachometer with lights)
  • Admiral panel with alarms (tachometer with gauges)
  • Dual station senders
  • Other gear ratios
  • Hydraulic transmissions
  • Remote expansion tank
  • Muffler and fittings
  • "A" and "B" on board spare parts kit
  • Alternator, 72 amp single output
  • Anti-siphon valve for overboard cooling discharge water
  • Technical Manual
  • Exhaust connection - 45 and 90 degree elbows, exhaust riser
  • Propeller shaft couplings
Universal M3-20B

M3-20B Request Purchasing Info

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