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Cat 3116 alternator

Discussion in 'Diesel Engines/Drives/Transmissions/Props' started by Chris Kinney, Aug 6, 2020.

  1. Chris Kinney

    Chris Kinney New Member

    Aug 6, 2020
    1996 450 Sundancer
    Cat 3116
    Can someone tell me the OEM part number for the Cat 3116 alternator. Also if anyone knows the new alternator part number. I ordered a new one and it wasn’t even close even though it said it fit my motors
  2. fwebster

    fwebster Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    Oct 6, 2006
    Middle Tennessee ; Panama City Beach, FL
    1996 450DA
    3116 Caterpillars
    There are 2 important umbers on the valve cover of your boat: the engine serial number and the "AR#, which is the arrangement number. Take both to your local Caterpillar dealer and order a remanned Cat Alternator or take the alternator part number to a Leece-Neville/Prestolite dealer and ask then to match the Cat part number.

    Just ordering an alternator for a 3116 will just lead to frustration because Cat supplies engines for everything from school buses to road graders thru their dealer/distributor network. Their parts system is very precise and you need the AR# to get the right alternator. Leece Neville is a huge OEM supplier fro alternators etc. and the aftermarket is addressed by their Prestolite Division. They can cross the Cat part number to a Prestolite alternator which will save you a few $$.

    I went thru this 4-5 years ago and found that Prestolite changes alternators pretty frequently. I found that the original alternators for my 450 were 56 amp and the current replacements were 98 amp. So, there may be something to gain by going the route described above so you get the latest alternator design.
    Last edited: Aug 7, 2020
  3. Chris Kinney

    Chris Kinney New Member

    Aug 6, 2020
    1996 450 Sundancer
    Cat 3116
    Thank you, I really appreciate the feed back
  4. JVM225

    JVM225 Well-Known Member GOLD Sponsor

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    Google “DB Electrical.”
    You can use their website or call them to figure out the one you need and their prices for brand new alternators are pretty competitive.
  5. Riptide III

    Riptide III Active Member

    Dec 8, 2007
    Dartmouth MA
    1997 Sea Ray 400DA
    Cat 3116 TA
    1994 Sea Ray Laguna CC 250 Tohatsu
    Local shop rebuilt both mine. One day turn around and $100 each.
  6. Chris Kinney

    Chris Kinney New Member

    Aug 6, 2020
    1996 450 Sundancer
    Cat 3116
    Prestolite and caterpillar were no help they just keep sending me back to the alternator that won’t fit the motor.
    prestolite model number 8MR2070TA
    I’m lost anyone else have this issue?
    Here is a picture difference between the two. Mounting brackets won’t come close to fit and the new alternator will only take a single belt pulley

    Attached Files:

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