Impeller part number?

Discussion in 'General Maintenance/Repair Questions' started by wayne0, Oct 22, 2019.

  1. wayne0

    wayne0 Active Member

    459
    May 4, 2014
    Newburyport, Ma.
    2000 340 Sundancer
    Twin 7.4 ltr.V-drives
    2000 340 7.4 ltr. MPI. Had both done a couple years ago, now starboard is not pumping water. Pretty sure I can squeeze in there and do it myself. Want to make sure i get the right one.
     
  2. RollerCoastr

    RollerCoastr Well-Known Member

    Nov 15, 2007
    Cedar Point, OH / Miami, FL / MacRay Harbor, MI
    1997 400DA
    340HP 7.4 Mercruiser Bluewaters
    Garmin 741, 742, 8212, 24HD, Intellian I2
    1999 280BR
    Twin 250HP Merc 350 Alpha Ones
    It's just a "Bravo 3" impeller. Buy three of them - replace the impellers in both engines and keep a spare onboard. Make sure you extract all the pieces of broken blades.
     
  3. wayne0

    wayne0 Active Member

    459
    May 4, 2014
    Newburyport, Ma.
    2000 340 Sundancer
    Twin 7.4 ltr.V-drives
    These are inboards. Same impeller?
     
  4. Air O'Nautical

    Air O'Nautical Active Member

    Feb 5, 2008
    Stamford CT "Ponus Yacht Club"
    1995 400EC. Raymarine E80,4kw dome, Garmin 235 gps,
    2013 7.4L Mercruiser Blue water.
    Hurth straight shaft 630's,
    Westerbeke 7.0 BCG
    Yes, same impeller as the Bravo III is used on the 7.4L/454.
    (The bravo III has no pump in the outdrive)
    It’ll come with the plastic housing, rubber impeller, stainless wear plate, 2 other seals and the bolts :) $100ish OEM or $75ish Serria or similar.
    I’ve had good results using both.

    Removing the whole pump on the bracket to install the new kit is often easier.
     
  5. RollerCoastr

    RollerCoastr Well-Known Member

    Nov 15, 2007
    Cedar Point, OH / Miami, FL / MacRay Harbor, MI
    1997 400DA
    340HP 7.4 Mercruiser Bluewaters
    Garmin 741, 742, 8212, 24HD, Intellian I2
    1999 280BR
    Twin 250HP Merc 350 Alpha Ones
    Oh, yeah - I should've explained that the "B3" description is not only confusing for inboard owners, but it's industry-wide, not just a particular brand.

    I keep a spare housing, but I haven't had to replace one. I sold one to a neighbor on a Friday afternoon because his cracked when he over-torqued the bolts. Otherwise if you keep sand out of the system they seem to last fairly long.

    The wear plate is reversible, so you can re-use those too. That can allow you to sometimes buy just the impeller kit.
     
  6. Stee6043

    Stee6043 Well-Known Member

    Jun 1, 2015
    West Michigan
    1997 Sundancer 400
    7.4L Gassers
    Get yer bottle of whiskey ready. The pumps on your 340 are in a wickedly horrible location. You will not likely enjoy this project. It's going to make you want an older 400. ha :)
     
  7. wayne0

    wayne0 Active Member

    459
    May 4, 2014
    Newburyport, Ma.
    2000 340 Sundancer
    Twin 7.4 ltr.V-drives
    Actually, I did the starboard once a long time ago. Attempted the port and half way thru I said "fukkit" and made the phone call. Could they have put them in a worse spot, like under the tranny?!
     
  8. wayne0

    wayne0 Active Member

    459
    May 4, 2014
    Newburyport, Ma.
    2000 340 Sundancer
    Twin 7.4 ltr.V-drives
    Found the kit on Amazon. Thanks all.
     
  9. wayne0

    wayne0 Active Member

    459
    May 4, 2014
    Newburyport, Ma.
    2000 340 Sundancer
    Twin 7.4 ltr.V-drives
    Came today. Under$60 from "ReplacementKits.com.
    Looks perfect. Has wear plate, housing, impeller and bolts.
     
  10. wayne0

    wayne0 Active Member

    459
    May 4, 2014
    Newburyport, Ma.
    2000 340 Sundancer
    Twin 7.4 ltr.V-drives
    I went down today and figured I'd start the project. First bolt on the bracket (lower one) was tight, but gave a bit then seemed to move a little better. After a couple pulls on the (3/8") ratchet it came out and fell in the bilge. I think it broke! If it did, it had to have been weak to begin with for a 3/8" ratchet to snap it. I have to bring a magnet down now and try to fish it out to confirm. I didn't get to the upper bolt as I didn't have a 5/8" open end on the boat. To use a socket I'd have to pull a coolant hose, which I'm trying to avoid. Updates to follow.
     
    Last edited: Nov 3, 2019
  11. Stee6043

    Stee6043 Well-Known Member

    Jun 1, 2015
    West Michigan
    1997 Sundancer 400
    7.4L Gassers
    FWIW when I had the impellers changed on my 99 340 they did pull the coolant hose (both sides I believe). It didn't sound optional when I had it done but it wouldn't surprise me if they were just trying to make some extra money.

    Good luck! I hope your bolt is not broken. That would be a tough spot to work the remaining piece out...
     
  12. RollerCoastr

    RollerCoastr Well-Known Member

    Nov 15, 2007
    Cedar Point, OH / Miami, FL / MacRay Harbor, MI
    1997 400DA
    340HP 7.4 Mercruiser Bluewaters
    Garmin 741, 742, 8212, 24HD, Intellian I2
    1999 280BR
    Twin 250HP Merc 350 Alpha Ones
    I think I've finally gotten mine down to a science. I should've timed the last change, but I have it under the 40 minute mark, not including prep. I apply lube to the new impeller and press it into the spare housing and set it aside ahead of time. (plumbers grease when I'm really prepared, dish soap when I'm not) Aside from being able to do this before ever opening the hatch, I've found that it can make the new impeller more cooperative when time comes to mount it and fully-compress the blades.

    I no longer try to remove the hoses during disassembly. I've fought that fight in the past and have decided it's not worth it. Keeping the hoses in place makes a few bolts more difficult to get at, but the engine mount conspires with the hoses to make it easier IMO to fight the bolts. I have a set of "stubby" wrenches that help, not to mention that the 400DA has a lot of room around the engines...

    Once the housing is free, then I remove the hoses. During re-assembly, the forces of stubborn rubber hose and annoying engine mount almost make the hoses pop back on by themselves.

    I've never done this on a 340 though, so this might be useless information...
     
  13. wayne0

    wayne0 Active Member

    459
    May 4, 2014
    Newburyport, Ma.
    2000 340 Sundancer
    Twin 7.4 ltr.V-drives
    OK, now it's getting real cold, so I think I will tackle this in the spring. I did pull the hoses to drain the manifolds so I don't have to worry about them. I don't care if the pump body cracks, as I have a new one. Everything else, I think, is good.
     

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