Replacement Sea Water Pump

wm61356wm61356 Harrison Twp., MIPosts: 151 ✭✭✭
I've begun to work on some of the items on my maintenance list for the off season. Today I pulled the port sea water pump to replace the impellor. When I inspected the brass housing after removing the impellor I noticed curricular score marks on both the housing and end cap. The scoring is deep enough to be felt with my fingers. I wasn't having any engine cooling problems last summer but, now that I know the pump housing is worn, I'm not comfortable just installing a new impellor and reusing the pump. It's gotta go! My question is: what would those of you who have been in this situation recommend? Should I go with a new OEM pump from Merc, the replacement from Sierra, or a stainless steel pump from Hardin Marine? I read on a previous post that someone got the pumps from Hardin Marine and experienced early bearing failure. The OEM pump has lasted 6 years so I would likely get that much or more from a new OEM unit. Are the stainless steel pumps as reliable as the original units?  Thanks in advance to all who reply.

Comments

  • Handymans342Handymans342 Cape Coral, FLPosts: 4,501 ✭✭✭✭
    edited November 2016
    Hardin  #1
  • frenchshipfrenchship Québec ,CanadaPosts: 1,040 ✭✭✭

     Have a look at this, I used it with really good result. I look at it after two years still in good shape.
    http://metalartetc.com/epages/3491964f-553f-4c10-8659-1241e68dccdb.sf/en_US/?ObjectPath=/Shops/3491964f-553f-4c10-8659-1241e68dccdb/Products/SSWP-FKX1
  • Handymans342Handymans342 Cape Coral, FLPosts: 4,501 ✭✭✭✭
    That may work well Paul
  • wm61356wm61356 Harrison Twp., MIPosts: 151 ✭✭✭
    @friendship - does the kit work with the standard impellor or is a shorter one required? Was there any modification to the pump bracket needed to mount the pump? Thank you for the information.
  • onislandtimeonislandtime MarylandPosts: 124 ✭✭
    My STBD seawater pump is being replaced in the spring before season launch. I also have read and its been recommended to use Hardin Pump. This was the first I have heard of a bad Hardin pump from anyone. I think its like anything else, some people swear by certain products and others can't say anything good. Who hasn't ever bought something and got one that was bad lol. I will be replacing my pump with a Hardin pump.
  • LaReaLaRea Alexandria VirginiaPosts: 1,742 ✭✭✭✭
    Pump life is hard to predict.  A new pump might last 10 years in the right conditions, or it might be destroyed in minutes if you run a bunch of sand through it.  

    One nice thing about having a replaceable wear plate:  if your pump dies in the middle of nowhere, you can replace the wear plate and keep going.  
  • frenchshipfrenchship Québec ,CanadaPosts: 1,040 ✭✭✭
    Yes I used the regular impeller from Mercruiser on my twin 5.0 mpi no mod was necessary to mount the pump. 
  • frenchshipfrenchship Québec ,CanadaPosts: 1,040 ✭✭✭
    By the way you just remind me to order two extra kits just in case...... While they are on sale.




  • wm61356wm61356 Harrison Twp., MIPosts: 151 ✭✭✭
    Thank you for the Information. I have 350 Mag MPI motors but I think the water pumps are the same. 
  • frenchshipfrenchship Québec ,CanadaPosts: 1,040 ✭✭✭
    I would think so. I do remember that the instructions do mention something about this. You could talk to the person about it he was really friendly with me 
  • JohnCostellloJohnCostelllo Posts: 43
    Does anybody know any tips on changing out impeller on Sea water pump on a 2008 260 Express Cruiser?  I see it but cant get to it.  Thanks


  • rasburyrasbury Sanford, FLPosts: 2,977 ✭✭✭✭
    I have the spacers in my merc pump and very satisfied vs 700 bucks for a new pump. It is, however,no doubt about 1/16 shorter an impeller to make up for the spacers...should be all in the kit.
  • reneechris14reneechris14 Pawcatuck river CTPosts: 606 ✭✭✭
    Remove belt,remove idler pulley,unbolt bracket holding pump,slide it out a little bit then get the hose clamps.a small monkey is also helpfull.
    2005 Rinker FV342  boat name "Ten Forty"  Pawcatuck river,Ct
  • Liberty44140Liberty44140 Bay Village & Marblehead, OH.Posts: 935 ✭✭✭
    I left my hoses attached and just removed the pump housing to change the impeller. Could not have done it without a 10mm short stubby open wrench. 
    Wine-N-Down -- 2006 342 Express Cruiser

  • reneechris14reneechris14 Pawcatuck river CTPosts: 606 ✭✭✭
    That's great thinking I will try that.
    2005 Rinker FV342  boat name "Ten Forty"  Pawcatuck river,Ct
  • rasburyrasbury Sanford, FLPosts: 2,977 ✭✭✭✭
    me too Liberty....got it down to a science now...
  • Liberty44140Liberty44140 Bay Village & Marblehead, OH.Posts: 935 ✭✭✭
    Yea it wasn't as bad as I thought it would be. Next time I'm bringing a grinder with me to grind off that tab on the pump preventing you from easily getting it past th cool fuel module. I loosened my module but it didn't help much. Of course had to remove belt, idler, alternator arm but those are simple. I saw this on a utube video from th 4 wins site. 
    Wine-N-Down -- 2006 342 Express Cruiser

  • AlswaggAlswagg Posts: 1,556 ✭✭✭✭
    Liberty simply remove one of the studs.  
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