This is the only 72A Leece-Neville / Motorola frame adjustable internally regulated small case alternator specifically designed and built from the component level ready to drop into a Universal or Westerbeke diesel with a 3/8" belt. The CMI-72-IR is directly built on the same frame as the factory original 51A 8MR2049K or 8MR2049KA only with a 72A output & a custom regulation voltage set point. This alternator does not exist anywhere else because we specifically build it here as a direct replacement for the original 51A unit.
What sets this alternator apart from an off the shelf unit are the components chosen to build it and make it ready for installation. High copper content brushes, high output diodes, high volume fan, ignition excite, just like your stock alternator, & a custom billet machined pulley make this the ideal replacement alternator for a Universal Diesel engine. The CMI-72-IR is directly built on the same frame as the factory original 51A 8MR2049K or 8MR2049KA only with a 72A output & CMI adjustable regulator.
The amperage of this unit was specifically chosen to work in concert with the stock 3/8" width v-belt to minimize belt dusting and maximize amperage performance.
The CMI-72-IR includes a custom billet machined 3/8" belt pulley (not cheap stamped steel), an upgraded high copper content brush assembly, an ignition-excite regulator that we can pre-set to your desired voltage, heavy-duty rectifier and a 2" foot that accepts a 3/8" bore bolt. Please ensure your alternators pivot bolt is 3/8" OD before ordering.
All of these features are all by Compass Marine Inc. so you have a ready to run unit. Even if you were to source the parts and build this alternator yourself you simply can't beat this price.
The internal regulator chosen for this alternator is internally adjustable, by us, before we ship the unit. We had been using an externally adjustable unit but too many folks messed with it, as well as the salt air, and ruined the regulators. The adjustment pots are quite delicate so we came up with a regulator where the adjustment is not outside the regulator, but rather sealed inside it. Please specify the target voltage you desire when ordering so that we can set it during testing.
IMPORTANT: We do not advise that customers adjust the voltage. The adjustment pot is extremely sensitive and over turning it can ruin the adjustment pot. It is only recommended to adjust this on a test bench where the bench is stable and not vibrating.
This 72A internally
regulated alternator is intended to replace the stock alternators found on many Universal Diesel or Westerbeke engines. It will fit any Universal or Westerbeke engine that uses a 2" foot 3/8" bolt bore 8MR style alternator. This alternator fills the gap between a true
high performance alternator (see our other alternator offerings) and the
very, very expensive factory internally regulated alternators. It was designed to meet a price and performance
niche not available to boaters previously.
The CMI-72-IR comes standard with a tachometer output stud (stator tap) for diesels that run the tachometer sense off the alternator. Not all engines drive the tachometer from the alternator, but most Westerbeke and Universal engines do. The CMI-72-IR is also available with external regulation and will keep your belt healthy and offer improved and healthier charging. If ordered for external regulation you will need an external regulator to install this alternator.
*All CMI Alternators are custom built and may require a 1- 2 week lead time.