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Cat 3116 Diesel engines

Discussion in 'Technical Discussion' started by Earl Mastin, Jun 4, 2018.

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  1. Earl Mastin

    Earl Mastin New Member

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    OK guys Now I need to know the pro's and con's on Cat 3116 diesels. Compare to 3208's. Thanks again.
  2. Capt Ralph

    Capt Ralph Senior Member

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    Did you buy it yet?
  3. Earl Mastin

    Earl Mastin New Member

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    No. Do you have info ? Appreciate any pro's or con's. Thanks
  4. Capt Ralph

    Capt Ralph Senior Member

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    IMO
    The 3116s had problems at the start. Cat did fix the valve and head issues but all owners had to fight (and still loose) claims.
    Deep and thorough records will be required for me to even come close to the 3116 or 3126s.
    The inter-coolers have a couple year service life. If your looking at something with old inter-coolers walk now.
    I am feared the life span (and support) of these monsters will be half of the ledgened 3208. I feel Cat has already started to really wind down from this model.
    If it's in an old SleRay, don't walk away, run.
  5. Earl Mastin

    Earl Mastin New Member

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    Thanks very much Capt. Ralph. That makes my decision very easy. No need to take a chance.
  6. Capt Ralph

    Capt Ralph Senior Member

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    Sorry I'm an old puss on this topic. My wife calls me Mr doom & gloom.
    Now, you find something with a 34 series in it and I'll dance on the roof fer ya.

    What kind of boat are your looking for?
  7. Earl Mastin

    Earl Mastin New Member

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    Looking at boats from 42- 50ft for cruising the NW waters including SE Alaska. Prefer trawlers. All seem to be very $$$$ unless you find one with engine problems or very high hrs. Just trying to find a good all-round boat that will give us a few good years. My wife and I are seniors and don't want to buy something that could have major problems. We are seasoned NW boaters so this is not entirely a new venture but need something to enjoy with the family and friends. We are working with a broker that we have bought and sold boats with before so feel comfortable we can find the right boat but I want to be sure I know a little more about the main concerns..... engines. Thanks for your opinions on my concerns. I appreciate learning from your knowledge and experience. We look forward finding the right boat and enjoying our summers on the water. Earl
  8. Capt J

    Capt J Senior Member

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    I'd take a 3116 over a 3208 any day. The 3116's have a lot of torque, burn clean, and aren't susceptible to overheating if you don't clean the coolers every 2 years like the 3208. The 3208's may be more durable in the low HP versions than the 3116, but they're certainly NOT more durable in the 375-425HP configurations. The 3116's are fairly good motors if they've had all of the aftercooler/etc. updates.
  9. Capt Ralph

    Capt Ralph Senior Member

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    One customer came in with another boat a few months ago, a 2007 Norseman 480. Nice boat with 8.3 Cummins.

    Now, That is an engine not be afraid of. The old mechanical 8.3 are bomb proof. Still supported for a long time to come.
    Any of the Cummins 6s are a good engines. Easy and on a whole, not to expensive to work on.

    Cummins Remans slip rite in.
    Last edited: Jun 6, 2018
  10. Capt Ralph

    Capt Ralph Senior Member

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    Problem with a lot of others boats out there, it's a jungle gym moving around them. Steps up, steps down, down, up just to get from the saloon to wheel house to head.
    Worked on a larger American Tug yacht that way. Been on a few Krogens that way.
    Every lil area or spot on a different level.
  11. Earl Mastin

    Earl Mastin New Member

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    Thanks Capt. J
    Thanks , all good info.
  12. revluc

    revluc Member

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    In the winter of 1996 we had our (1985) 40’ Tollycraft repowered with 3116’s and still have the boat and never had a problem outside regular maintenance. Now it is our “northern” boat and lives on the upper Mississippi River (fresh water) so it isn’t what I would call high hours given the length to f the season and the Lock system. But since day 1 the engines have never smoked or smoked very and again no problems.
    Maybe we are the lucky ones as you do read horror stories about them on boat engines websites. Oh and we run them 85% on plane and the rest hull speed or idle waiting for the Locks
  13. Capt Ralph

    Capt Ralph Senior Member

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    Wow. Good reports on these blocks.
    I luv good news. Maybe a good sign for the OP if service records were kept up on what he is looking for.
    My eyes see warm salt water service, all year long.
  14. revluc

    revluc Member

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    Our “southern” boats in Naples have been/are Tiaras with Cummins and again no problems with those that would be out of the ordinary for regularly/properly maintained engines.

    I believe there were issues with 3116’s that had their blocks cast in the foundry in France, dubbed “the French Blocks”, but it has been years since thinking or researching or looking for issues with the 3116’s. Feel confident in them that much. But fresh water engines lead a charmed life compared to salt for sure.
  15. Capt J

    Capt J Senior Member

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    The French blocks were on 3126's. Not sure if any 3116s had the same blocks or French blocks at all.
  16. JimmyL

    JimmyL Member

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    I have the 3116's on board. These are only 300 hp but reasonable on fuel. They have been flawless with no smoking or issues in any way. But, then again, I regularly service and maintain including the cooling systems as I would on any boat. Mine are 1995's and I don't recall any problems with this model.

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