[C38] C38 Losing circulating water

Mon Jun 16 12:01:10 EDT 2008

Hi Folks;

I have a persistent circulating water leak in my engine. I lose about 500 ml of antifreeze in about 50 miles of motoring. I have changed out the heat exchanger, the hoses, the radiator cap. Any thoughts on where the leak might be?

Bob Porter
Hiawatha
  ----- Original Message ----- 
  From: Max Soto 
  To: Catalina 38 Listserve 
  Sent: Monday, June 16, 2008 11:28 AM
  Subject: Re: [C38] Water pump

  This might help
  I got this from very old forums, but there are some part numbers.
  Oberdorfer Rotary Seals must seal 07/30/02 10:53AM http://forums.torresen.com/eThreads/view/engines/view_post?id=3916
  The first time I changed the impeller on my Oberdorfer I ended up pulling the whole shaft out and after replacing the impeller on the shaft and inserting the shaft back into the pump it started to leak water. (This water will rust the front of your engine as well as the oil pan) Very bad news. The next time I replaced the rotary seals as well as the impeller and this did stop the water leak. The shaft seems to be shaped like a Coke bottle that necks down to a considerably smaller diameter at both the water seal and the oil seal center point. This necking looks like an intentional design feature. Anyway, my engine needed a higher capacity pump and it is now using a Sherwood water pump no. 302648 - 42175 that has twice the water flow capacity. The pump came as a kit #302837 for retrofiting Universal models 5411, 5416, 5424, 5432, and 5444

        Sherwood has twice the flow of Oberdorfer 

        Markus Ritter (MarkusRitter at hotmail.com) 
       08/02/02 09:32AM 

        I replaced my Oberdorfer last week with a Sherwood, so far it is great. I love getting more water through and I no longer get steam.  see http://sankaty.homestead.com/Universal_5432_rawwater_pump_cap.html    A KIT IS AVAILABLE TO MOUNT THE CURRENT PUMP ON the universal 5411, 5415, 5424,5432, & 5444 IN PLACE OF THE OBERDORFER. KIT PART #302837. THE KIT CONTAINS THE NEW PUMP AND MOUNTING HARDWARE   some folks have also changed to the 3 inch heat exchanger in place of the original 2 inch unit. 
        see http://sankaty.homestead.com/Overheating_Heat_Exchanger_size_.html

        Pumps/oberdorfer/sherwood re:kubota/universal prices and compare 

        Rick (pelago at phoenixcon.net) 
       08/05/02 11:09AM 

        DEPCO PUMP COMPANY 1 800 445 1656   I have read with interest the posts re: gpm and cost and compare Oberdorfer with Sherwood.. the Universal/Kubota uses two types of pumps 2 bolt and four bolt, but in reality they are the same pump they are 202 pumps and the flow rate is 9.59 gal per minute at 2500 rpm... cost is $140.00 from Depco, I use them for all pump needs, rebuild kit is $32.31 and comes with all needed for complete rebuild. If you want to replace the shaft it is $21.57. Sherwood no longer makes the M-5 or the H-80 that would be the Sherwood model to replace the 202 style, However a Westebeke kit deal from Sherwood thru Westerbeke or Westerbeke distributor is G903 for 234.20..HOWEVER THE FLOW RATE IS DAMN NEAR THE SAME AS THE OBERDORFER...  no brainer 140.00 versus 234.20....  Just ordered a new oberdorfer as a backup for existing pump, also ordered a rebuild kit for ON HAND!!!!   happy sailing and Pelago is getting ready for cruise #8

  -- 
  Max Soto
  C38 #198 ESTANCIA
  Puntarenas, Costa Rica 

  2008/6/16, RICHARD KILROY <dickkilroy at verizon.net>: 
    There are two water pumps on the 5424 one is the saltwater cooling pump and
    the other the fresh water circulation pump. I have replaced both on my cat
    38 I think it is the saltwater pump that Charles has leaking, it has a long
    name I have forgotten( sounds Italian I think) If that is the pump it should
    be replaced with a Sherwood which is adapted to fit  by the dealer. it pumps
    more gallons per minute and cools the engine better. If the Great Lakes guy
    doesn't have what you want you can also try Hansen Marine in Marblehead Ma
    781=631-3282. There is a freeze plug on the bottom of the face of the engine
    where this pumps drip will run , if it goes on long enough, the freeze plug
    will corode and fail and you will loose the engine oil, again it happened to
    me in saltwater. Hope all ends well

    Dick

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