420/44 DB Owners Club

Discussion in 'Sport Yachts/Yachts' started by Alex F, Jan 21, 2011.

  1. Irie308

    Irie308 Well-Known Member SILVER Sponsor

    May 28, 2013
    CT
    2004 420 Sedan Bridge, GHS Hydraulic Lift
    Dual Raymarine E120W
    AB Mares 10 VSX with 30 hp Tohatsu
    Cummins 450C 8.3 L Turbocharged
    Looks like i would have to disassemble some of the exhaust elbow to get in there to rod them out. Doesn't seem like a lot of room on either end?
     
  2. craigswardmtb

    craigswardmtb Active Member

    182
    Jul 2, 2013
    Mystic, CT
    2004 420 DB
    2005 360 Fiesta Vee
    Cummins 6CTA
    Yep, that is on my list too. I got the SBMar end cap kit. Rookie question, but if i'm not removing the whole HX unit, does draining/changing coolant need to happen? The end caps only contain the tubed cooling passages that move seawater, right?
     
  3. Irie308

    Irie308 Well-Known Member SILVER Sponsor

    May 28, 2013
    CT
    2004 420 Sedan Bridge, GHS Hydraulic Lift
    Dual Raymarine E120W
    AB Mares 10 VSX with 30 hp Tohatsu
    Cummins 450C 8.3 L Turbocharged
    No coolant as its the raw water side, you'll get a little remaining antifreeze from your winterization, but not much.
    Actually now that i'm thinking about what ZZ13 mentioned above i'm going to order the 1/8 inch plastic rods from Amazon to see if it gives me some flexibility in cleaning out the tubes without remove the whole unit.
     
    craigswardmtb likes this.
  4. ZZ13

    ZZ13 Well-Known Member

    Nov 25, 2009
    Lady's Island, SC
    2001 400 Sedan Bridge
    Cummins 450 Diamond
    That is correct. If you use your boat enough you will find the tubes pretty clear, even in salt. Biggest thing I run into is pieces of broken off zinc clogging a few of the tubes on the bottom of the forward end. I pop off my end caps once a year.
     
    craigswardmtb likes this.
  5. craigswardmtb

    craigswardmtb Active Member

    182
    Jul 2, 2013
    Mystic, CT
    2004 420 DB
    2005 360 Fiesta Vee
    Cummins 6CTA
    What are these 1/8" rods you speak of? Link please if you have it handy.
     
  6. ZZ13

    ZZ13 Well-Known Member

    Nov 25, 2009
    Lady's Island, SC
    2001 400 Sedan Bridge
    Cummins 450 Diamond
    Anything you can find that's narrower than the tube and long. I've used wooden dowels, stiff wire used to prop up plants, even a skinny screwdriver to clean up the ends of the tubes (generally any blockage is just a few inches into the tube).
     
  7. Irie308

    Irie308 Well-Known Member SILVER Sponsor

    May 28, 2013
    CT
    2004 420 Sedan Bridge, GHS Hydraulic Lift
    Dual Raymarine E120W
    AB Mares 10 VSX with 30 hp Tohatsu
    Cummins 450C 8.3 L Turbocharged
    This is what I found on the aft end of my port heat exchanger when I opened it up last week. I tried to rod them out with a brass 1/8” rod but there is no room to really work due to the bulk head in one side and the exhaust elbow in the other. Would like to run the rod about the length of the exchanger which is over 2 feet in length. Going to see if a plastic rod that is flexible will work.

    2CCD58B1-10CC-4B7F-8AB0-6E05C123A5A4.jpeg
     
  8. ZZ13

    ZZ13 Well-Known Member

    Nov 25, 2009
    Lady's Island, SC
    2001 400 Sedan Bridge
    Cummins 450 Diamond
    Can you get your hand in there with something short to poke out the ends? My guess is it's all right there at the end of the tube.
     
  9. Irie308

    Irie308 Well-Known Member SILVER Sponsor

    May 28, 2013
    CT
    2004 420 Sedan Bridge, GHS Hydraulic Lift
    Dual Raymarine E120W
    AB Mares 10 VSX with 30 hp Tohatsu
    Cummins 450C 8.3 L Turbocharged
    Probably could but i'm concerned about forcing it in further.
     
  10. craigswardmtb

    craigswardmtb Active Member

    182
    Jul 2, 2013
    Mystic, CT
    2004 420 DB
    2005 360 Fiesta Vee
    Cummins 6CTA
    Nasty stuff. I found similar obstructions in the lower end of my port aftercooler along with a bunch of impeller pieces. It looks like you need to find a long flexible dowel to push through from up top. Perhaps a quick shot with a dremel carving bit would break up the pieces to where they would then fall out.
     
  11. Irie308

    Irie308 Well-Known Member SILVER Sponsor

    May 28, 2013
    CT
    2004 420 Sedan Bridge, GHS Hydraulic Lift
    Dual Raymarine E120W
    AB Mares 10 VSX with 30 hp Tohatsu
    Cummins 450C 8.3 L Turbocharged
    So i was able to rod out the HE this weekend though it wasn't easy it is doable in place. I picked up a couple 1/8" brass rods from the HD and order a pack of plastic rods from amazon. The brass rod was necessary for the ports that were truly blocked. My next plan of attach is to run a descaler through to ensure everything is nice and clean.
     
  12. Irie308

    Irie308 Well-Known Member SILVER Sponsor

    May 28, 2013
    CT
    2004 420 Sedan Bridge, GHS Hydraulic Lift
    Dual Raymarine E120W
    AB Mares 10 VSX with 30 hp Tohatsu
    Cummins 450C 8.3 L Turbocharged
    One more head scratcher that i can't seem to understand is why the difference in size of the port side exhaust tube? The Starboard side is much smaller in comparison. I can't seem to see a logical reason for the difference other than making it near impossible to change the waste tank filter.
     
  13. bbwhitejr

    bbwhitejr Well-Known Member SILVER Sponsor

    Apr 14, 2013
    Lake Lanier GA
    2007 44DB
    Cummins QSC 8.3s
    I think you answered your own question.....they love to give you a challenge....

    :D

    Bennett
     
    Irie308 likes this.
  14. Strecker25

    Strecker25 Well-Known Member

    Nov 20, 2014
    Rochester, NY
    1998 290 Sundancer
    Twin 5.7EFI/Alphas, Kohler 4kw
    I just talked to a broker representing a nice 2005 420 with the 480CE's. I asked the question about WOT, props, etc. He is pulling a survey from 2018 to see if they ran her up to WOT but the boat has thr 26x26 nibral props and is said to run 22-23 knots at 80% load. I know we need RPMs to really tell, but can anyone comment on whether that speed sounds in the proper range for that year/engine combo?
     
  15. Pura Vida dos

    Pura Vida dos New Member

    15
    Oct 23, 2017
    Grand Haven MI / Punta Gorda FL
    2005 420 Sedan Bridge, Highfield 340 on Freedom Lift, Garmin 7612
    Cummins 480CE
    Bought our 2005 420db w/480ce’s w/26 x 26 nibrals on her. Fuel burn #’s were to high so had them modified to 26 x 25, fuel burn still to high. Modified again to 26 x 24 & cup removed, fuel burn now right on!
    80% cruise speed is now about 20 mph.
    That’s fully loaded & 800lbs of Freedom Lift & dinghy
     
  16. craigswardmtb

    craigswardmtb Active Member

    182
    Jul 2, 2013
    Mystic, CT
    2004 420 DB
    2005 360 Fiesta Vee
    Cummins 6CTA
    I'm not close to the boat so cannot look at present time, but does anyone happen to know if we have a standard 3 prong 120 outlet in the engine room. I'm debating on putting a Twin Hornet engine room heater in there and getting rid of those problematic air heater assemblies on my engines. Any northerners have good luck in the shoulder seasons using a engine room heater versus the factory engine air heater assemblies?
     
  17. Carpediem44DB

    Carpediem44DB Well-Known Member PLATINUM Sponsor

    773
    Aug 18, 2015
    Sanfransico Bay area
    2006 44 DB Sedan Bridge Raymarine gs165 w Quantum HD Radar
    Achilles 350 Dink
    Nick Jackson Davit
    Cummins QSC 8.3 500 HD
    I did not have one on the 44 but installed one on the bulkhead high behind the port engine exhaust mixing elbow. It is wired in the battery charger circuit so I did not install a new breaker.
    Very convenient now though to have 110 power in the ER. I did put in a water resistant box.
    Cheers
     
  18. Strecker25

    Strecker25 Well-Known Member

    Nov 20, 2014
    Rochester, NY
    1998 290 Sundancer
    Twin 5.7EFI/Alphas, Kohler 4kw
    wow, it sounds like this boat is likely way Overpropped then. He carries a big rib with a 40hp on the hydraulic platform too. How many hours were on your motors when you bought it? Did the Cummins tech have any concerns that it had been run like that for a while?
     
  19. Pura Vida dos

    Pura Vida dos New Member

    15
    Oct 23, 2017
    Grand Haven MI / Punta Gorda FL
    2005 420 Sedan Bridge, Highfield 340 on Freedom Lift, Garmin 7612
    Cummins 480CE
    Purchased in 2017 with 200 hours, call me crazy but did not get a Cummins guy involved, now 700 hours
     
  20. Pura Vida dos

    Pura Vida dos New Member

    15
    Oct 23, 2017
    Grand Haven MI / Punta Gorda FL
    2005 420 Sedan Bridge, Highfield 340 on Freedom Lift, Garmin 7612
    Cummins 480CE
    My 420 doesn’t have any 120v outlet in engine room either. If needed I would consider tying into washer/dryer outlet on back side galley cabinet under steps ahead of starboard motor. Boating in Florida now so disconnected air heaters after having to replace both alternators!☹️. I believe sbmar refers to and sells Wolvorine pan heaters as an option.
     

Share This Page

Show Sidebar