Official Cummins 6cta 450C thread

Discussion in 'Diesel Engines/Drives/Transmissions/Props' started by FeLizDream, Apr 24, 2016.

  1. FeLizDream

    FeLizDream Member GOLD Sponsor

    230
    Jun 28, 2015
    Marco Island Yacht Club, FL
    2001 Sea Ray 400 Sedan Bridge, with engine synchronizer.
    Cummins 6cta 450 HP, prop 22 Lx 23" L cup.
    I just replaced both turbo oil drain pipe and hose (see picture), the other day I was in the engine room cleaning and painting and suddenly notice one of the pipes very rusted at the connection with the hose, I went to Cummins dealer and bought 2, it is just a piece of galvanized pipe, I gave it 3 coats of anti rust paint, and 2 coats of Cummins paint beige, also bought new hoses, easy to replace.
     

    Attached Files:

  2. NotHerDecision

    NotHerDecision Well-Known Member GOLD Sponsor

    Jun 28, 2016
    Houston, Texas
    2001 Sea Ray 460 Sundancer
    2014 Seadoo 155 LTD
    2105 Seadoo 130 SE
    2013 Mercury Dinghy
    Cummins 6CTA 8.3L
    Felizdream

    Do you happen to have the part number? I’m going to get a couple.

    Thanks

    Josh
     
  3. FeLizDream

    FeLizDream Member GOLD Sponsor

    230
    Jun 28, 2015
    Marco Island Yacht Club, FL
    2001 Sea Ray 400 Sedan Bridge, with engine synchronizer.
    Cummins 6cta 450 HP, prop 22 Lx 23" L cup.
  4. NotHerDecision

    NotHerDecision Well-Known Member GOLD Sponsor

    Jun 28, 2016
    Houston, Texas
    2001 Sea Ray 460 Sundancer
    2014 Seadoo 155 LTD
    2105 Seadoo 130 SE
    2013 Mercury Dinghy
    Cummins 6CTA 8.3L
    Thanks. 56 bucks on order.

    Josh
     
  5. manfredr

    manfredr New Member

    17
    Apr 3, 2008
    Westport, CT
    420 Sedan Bridge 2004
    Cummins 450C
    This may be a mute point for you by now. I had to make the aneroid adjustment a few years ago, because my starboard engine was lagging severely (appr. 20 sec) I used Tony's instructions after I bought the special Torx tool to get access to the aneroid. The fix worked like a charm, never had a problem again!
     
  6. ZZ13

    ZZ13 Well-Known Member GOLD Sponsor

    Nov 25, 2009
    Lady's Island, SC
    2001 400 Sedan Bridge
    Cummins 450 Diamond
    Thanks. Mine ended up being a worn turbo. Got it rebuilt and it spools instantly now.
     
  7. ZZ13

    ZZ13 Well-Known Member GOLD Sponsor

    Nov 25, 2009
    Lady's Island, SC
    2001 400 Sedan Bridge
    Cummins 450 Diamond
    I ended up deciding on the SeaKamp version. Around $350 on average from all the online places.
     
  8. ZZ13

    ZZ13 Well-Known Member GOLD Sponsor

    Nov 25, 2009
    Lady's Island, SC
    2001 400 Sedan Bridge
    Cummins 450 Diamond
    F82A178B-0452-4F16-82C1-0568C6CD9FC1.jpeg I am probably going to remove my fuel coolers. Don't need them in the climate where I boat and it's just another place to fail involving salt water. But I do have a question. What is this thing for that's on the tank side of the fuel cooler?
     
  9. my3sons

    my3sons Well-Known Member SILVER Sponsor

    Feb 24, 2009
    Upstate NY (lake Erie)
    2004 400DB, Onan 9 kw Gen, Highfield RIB,
    Cummins 6CTA
    Not sure what it's purpose is, but looks like an adaptor to npt from orfs. Maybe some applications have need to connect something else to that tee?? Mine has it also but I can't think of any reason why it needs to be there on our boats. A 90degree fitting on the hose or just a straight adaptor would be fine.
     
  10. ZZ13

    ZZ13 Well-Known Member GOLD Sponsor

    Nov 25, 2009
    Lady's Island, SC
    2001 400 Sedan Bridge
    Cummins 450 Diamond
    Well I finally did it. After two years of pondering it I dropped the pitch on my 400 Sedan Bridge from 24 to 23 to gain 125rpm at WOT. I was hitting 2625rpm at my normal load, but my normal load is not fully loaded with fuel and water. Plus all my Cummins buddies (both Sea Ray and non Sea Ray owners), as well as sbmar, told me to get to 2750. So there is that. I'll just give her a bit more throttle to make up for the speed loss. Ha!
     
  11. Carpediem44DB

    Carpediem44DB Active Member GOLD Sponsor

    225
    Aug 18, 2015
    Sanfransico Bay area
    2006 44 DB Sedan Bridge Raymarine E120 radar chart plotter GPS autopilot
    cummins QSC 8.3 500 HD
    I’m probably an inch or so under pitched for optimum performance but I sleep soundly knowing I’m not overloading my engines. Rather buy fuel now instead of an engine prematurely.
     
  12. ZZ13

    ZZ13 Well-Known Member GOLD Sponsor

    Nov 25, 2009
    Lady's Island, SC
    2001 400 Sedan Bridge
    Cummins 450 Diamond
    I ended up at a pitch of 22.8. The 420 mile trip home on them went great. I lost about 1mph or so at my previous cruising rpm of 2100. But I gained all of that back and a little more because I now run at 2200. Most noticeable difference was the puff of black smoke I had when spooling up my starboard engine, completely went away. By the way, the port prop was found to be at 23.8 prior to and the starboard prop at 24.1. So the starboard engine was working a bit harder. I highly recommend anyone who bought a used boat and has never had props checked, pull them and at least get them scanned even if you are running smooth. You might be surprised at the actual numbers.
     
    Last edited: Apr 13, 2018
    Blueone likes this.
  13. PMC

    PMC Active Member

    Apr 10, 2009
    Long Island, NY
    2001 40 Sedan Bridge
    Cummins 6CTA
    ^^ what he said. I cut my props to 22.5 pitch, and the engine spins to 2680, with no smoke. I've been running this for a few years, and my engines are happier for it!
     
  14. ZZ13

    ZZ13 Well-Known Member GOLD Sponsor

    Nov 25, 2009
    Lady's Island, SC
    2001 400 Sedan Bridge
    Cummins 450 Diamond
    When I bought the boat the factory Sherwood seawater pumps were toast. So I bought Tony's SMX pumps and impellers. A tad pricey at $750 each but a spare impeller was included in addition to the one inside the pump. So effectively about a $675 pump. I planned to replace the impellers at the traditional two year mark. But when I took them out they still looked brand new. So I called sbmar and asked what's up. Corey told me as long as you use the boat regularly and don't let the impellers sit and get set, they are getting reports of 600-800 hours out of them. So I just pulled them again and here they are at 4 years and 500+ hours. They are going back in for another year/100+ hours. And those spares are still in their box waiting to be used. Plus the pumps also still look new. Some of the best money I have spent on this boat are these pumps/impellers.
     

    Attached Files:

    Blueone and FeLizDream like this.
  15. FeLizDream

    FeLizDream Member GOLD Sponsor

    230
    Jun 28, 2015
    Marco Island Yacht Club, FL
    2001 Sea Ray 400 Sedan Bridge, with engine synchronizer.
    Cummins 6cta 450 HP, prop 22 Lx 23" L cup.
    I just did the same
    I replace both
    Great pumps
    The Port pump is a pain, but I just remove all heat exchangers and aftercooler, so it was easier to change the PORT pump
    Without removing that, I don’t have any idea how you could remove/ change the pump
    I agree excellent pumps
     
    Last edited: Apr 17, 2018
  16. PMC

    PMC Active Member

    Apr 10, 2009
    Long Island, NY
    2001 40 Sedan Bridge
    Cummins 6CTA
    My old sherwood impellers were in bad shape after 2 years, and I replaced both pumps with SMX spring 2017.....I'm happy to hear of the longevity.
     
  17. FeLizDream

    FeLizDream Member GOLD Sponsor

    230
    Jun 28, 2015
    Marco Island Yacht Club, FL
    2001 Sea Ray 400 Sedan Bridge, with engine synchronizer.
    Cummins 6cta 450 HP, prop 22 Lx 23" L cup.
    I just removed all the aftercoolers and heat exchangers, oil coolers.
    My engines are 1,250 hours, Last year I flushed the inside with barnacle buster, took it to the radiator shop for a full service, when they Presure tested one of the core was leaking air, so is time to order 2 new cores, I order it directly from Cummins about $ 1,525 each.
    Recommendation flushing the coolers is not enough, you must remove it to check the core.
    Only one was leaking, but I think is safer to change both, the radiator shop told me maybe the previous owner ran acid creating the leaking.
    See pictures
     

    Attached Files:

  18. Jaybeaux

    Jaybeaux Active Member SILVER Sponsor

    250
    Jan 3, 2016
    Upper Potomac River
    420 Sundancer 2004
    Naught On Call
    Cummins 6CTA-8.3's with V-Drives
    9KW Onan Genset
    Id love to hear all of the details of this project; but I'll limit it to a few!

    1. Are you replacing all hoses at the same time?
    2. How hard is it to remove the hoses?
    3. Lastly, how much other equipment did you have to remove to accomplish this? Exhaust tube? Turbo charger? etc...

    Thanks for the pics.

    Jaybeaux
     
  19. FeLizDream

    FeLizDream Member GOLD Sponsor

    230
    Jun 28, 2015
    Marco Island Yacht Club, FL
    2001 Sea Ray 400 Sedan Bridge, with engine synchronizer.
    Cummins 6cta 450 HP, prop 22 Lx 23" L cup.
    Jay beaux
    I just replaced all the hoses last year, they are still in very good shape, so I am using the same hoses. I bought the entire hoses kit from Cummins.
    2) Hoses are very easy to replace, just give it a little wiggle with a special hose tool removal.
    3) It is really not hard to remove, it was my mechanic and a helper and they remove everything in 4 hours, you don’t need to remove the exhaust hoses, nor the turbos, we remove the air separator filters to gain access to change the port raw water pump.
    4) my original black exhaust hoses are starting to leak sea water, I am going to replace them with the new 6” blue silicon hoses, I will post a picture.
    5) I strongly recomend specially on the port side, after you remove everything to change the raw water pump to the new version, or at least replace the impellers on the Port side.
     
    Jaybeaux likes this.
  20. FeLizDream

    FeLizDream Member GOLD Sponsor

    230
    Jun 28, 2015
    Marco Island Yacht Club, FL
    2001 Sea Ray 400 Sedan Bridge, with engine synchronizer.
    Cummins 6cta 450 HP, prop 22 Lx 23" L cup.
    Jaybeaux
    I just saw you have V-drives, looks like your engine room is easier to work.
    Look at how my mechanic has to crawl to acces the water pump, after the aftercoolers removal.
     

    Attached Files:

    Jaybeaux likes this.

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