Fresh water pump on W18 in our 26 Ultra

Newsgroups Archive Prior to 2025
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Looking for advice on replacing our Fresh Water pump. This is the pump that circulates engine coolant rather than the raw water pump that circulates lake water. The Fresh Water pump operates off the engine drive belt. The drive belt pulley on our W18 has become loose. I’m not sure whether was related to an engine stall likely cause by harbour weeds or just wear. In any case I believe my only option is to replace the pump. The next step is to establish which of 3 possible pumps is the correct on for our motor. I’m thinking the W045231 is the best match but will pull the pump off the motor to validate my choice. If others in this group have completed this replacement I would appreciate your comments

Ted Eedson
Purrfection 26U #232
Nudging up to Nauti Girl at Loyalist Cove Marina, Bath ON

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Ted;

Two things:

  1. The W13 that I had was based on a Mitsubishi K2C block; these are generic blocks adapted to all kinds of things. Lots of parts on “tractor restore” forums, etc.

The “K2C” was sand-cast into the side of the block; port side, and was quite visible when I looked for it.

  1. I’d be very surprised that the weeds would give the fresh water pump and pulley an issue. The raw water pump and impeller maybe.

What symptoms of failure are you seeing? Loose pulley on pump shaft? Pump seized?

I’ll be down at LCM Monday around noon if you want another set of eyes on the problem.

John
NS26C 046 Cat’s Whiskers
Getting brand new AGM batteries Monday AM;
No longer has the original “Ray Jefferson” charger;
But the new charger is not quite installed yet…
Bath, Ontario.

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Thanks John
Investigations yesterday had the engine running but with the drive belt vibrating excessively. Looking closer the water pump shaft was loose. See photo.

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Not sure on why this happened but it is clearly the issue.
So the challenge is to establish the Westerbeke part number (I think that is solved) and then is it still available or are there more cost effective alternatives.

I’m hoping the parts alternatives will become apparent via the Nonsuch Discussion Group. Otherwise it will be a investigative exercise for Greg at Marine Outfitters.

I will update you on Monday.

Ted

eedted@gmail.com

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Anthony Keiths is a bit on the $$$ but they are usually able to source OEM parts.

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Ted: When I look up the circulation pump for a W18, I come up with 30591 as the Westerbeke part number and it fits the W18 and others. It appears to be available on many websites.

Joe Valinoti
S/V iL Gatto NS30U #221
Sea Harbour YC
Oriental, NC USA

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These are simple to repair. Call Archer Pumps in Kingston. Failing that call Doug Overbury at https://www.autoelectrickingston.com/ he may know a rebuild shop. Doug’s an old school chum.

You will need new gasket and bolts. The price here is USD a rebuild will be about $100 Keetes in Wheatley will cost at least $500 for a new one.

http://www.marinedieseldirect.com/catalogs/catalog_group.php?owner=mdd&page_ident=32139-266-267&model=W%2013/18/21/27/33%204.4/6/7.7/8/11/12.5%20KW%20Generators&manufacturer=Westerbeke&title=13-18-21-27-33%20Fresh%20Water%20Pump&quant_position=&catalog=32139&printparts=&printservice=&printoperators=&comment1=

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K3C water pump , looks just like the one in the WB parts catalog just not red.

https://www.amazon.ca/Water-Pump-565004093020-Mitsubishi-Engine/dp/B07DD88PS8

Tom
26C #28 W13 this pump is not for a W13 which is a K2C block.

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First off I’m going to call this the Engine Coolant Water Pump versus the Raw Water or Lake Water pump. The two pumps circulate liquid through the two parts of the heat exchanger to cool the motor.

Purrfection is operational again. Thanks to Tom Schoenhofer for the clue to solve this problem with an economic solution. Also thanks to Marine Outfitters for letting me return the Westerbeke pump for only the shipping costs.

The following is a summary of my experience. The pump is located on the front of the motor and operates off the fan belt. I started by removing the coolant. I could not find the coolant drain plug so used my extractor to remove the existing coolant. I then disconnected the exit hose from the pump and used the extractor to drain the remaining coolant. Next step was to loosen four bolts, one being longer, to separate the pump from the motor. The outside bearing on my pump was gone.

Possible solutions to this situation:

  1. A Westerbeke Fresh Water Pump #030591 ($645.00 CAD) with a gasket to motor #34074 ($12.00). This model is used for the W18-18A-21-27 marine motors. This pump was delivered to Marine Outfitters, Kingston within 2 days but was returned.

  2. The solution I chose was from Amazon.ca. It is a Holdwell Water Pump MM409302 for Mitsubishi Engine. The price $74.55 CAD, import fees $9.69 for a total of $84.24. There were other Amazon options with similar prices but longer delivery dates. This pump was delivered within one week.

Note: the actual Holdwell pump does not have the raised AISIN name as in this image.

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  1. The pump is also used by Mitsubishi #565004093020 and know as a #MM409302,

  2. The pump is manufactured by AISIN part #AISWPM-036

Before installation I removed the old gasket material and touched up the paint on the motor. The pump came with a gasket but I used the Westerbeke gasket, as the Holdwell gasket was larger than necessary. The Holdwell pump came with a secondary hose fitting. Using some heat I was able to remove the plug from the existing pump and replace the hose fitting on the new pump with my plug. I used a gasket sealant to ensure a leak resistant seal.

I also followed up with Thor’s school buddy. He was willing to take a crack at extracting the impeller and bearings. He would seek out replacement bearings from a local shop. When I found the Holdwell solution for under $100.00 it clearly became the way to go.

Thanks to the Discussion Group for helping with my challenge.

Ted EedsonPurrfection 26U #232
Nudging up to Nauti Girl at Loyalist Cove Marina, Bath ON

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Fantastic intel and support all around. Thanks Ted.

Neil Raynor
NS26C, #149
Collins Bay, Kingston, ON

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It is properly called a “circulation” pump as opposed to the “raw water” pump. That’s a great price, Ted and it pays to look at tractor engine parts rather then marine engine ones.

Joe Valinoti
S/V iL Gatto NS30U #221
Sea Harbour YC
Oriental, NC USA


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Hi -
I did this replacement 2(?) years ago for my 30 Ultra and posted the procedure, photos et al, on the discussion group… if interested search under coolant or fresh water circulation pump replacement.
Mine was leaking and I had been informed that the gasket was internal and could not be replaced/fixed. It was a fairly straightforward job and with good preparation (PB Blaster and tapping over the course of the preceding week) it went smoothly.

As Joe Valinoti pointed out, tractor supply houses are a good source for the Mitsubishi block parts. I bought my circulation pump replacement at Southern Global Tractor Supply - including shipping it was only $94, and they were very responsive to a few questions I had.

Peter Grabow
S/V CAKE WALK III
1987 30U 430
Jersey City, NJ

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Several years ago my water pump failed just prior to the 8 meter world cup hosted by our club. I had committed Mascouche to taking spectators to the race course and if necessary tow an engineless 8 metre from the club to the starting line. Needless to say the pump that had functioned ever since 1981 siezed the weekend prior to the regatta. Immediately I tried to source a replacement pump and found they would cost hundreds of dollars and would likely arrive well after the regatta. Plan B was to find a local machine shop to replace the bearings and service the pump.

I found a local Portuguese owned shop willing to take on the job and have it ready for the following weekend. I delivered it to them on the Monday and true to their word they called me on the Wed. evening to tell me it was ready. I picked it up first thing on Thursday and rushed it to our marine services that installed it ready for the weekend. I was pleasantly surprised when the machine shop charged me under $70.00 Cdn. for the work. This was a win/win situation. I got the pump in time at a fraction of the cost of a new one and it was a benefit to the fight against global warming. The pump has worked flawlessly ever since it was installed and likely to outlast me before it requires servicing again. My “Plan B” will always be Plan A in future. Part of the servicing included in the rebuild was the stripping of the orange paint used by Universal leaving it with a silver finish (see photo attached)

Mascouche fulfilled her obligations taking spectators to the race course and did tow a US 8 metre from the Club to the starting line. All had a happy ending with a 1930 RCYC yacht “Bangalore” winning the cup and being invited by the King of Norway inviting Bangalore and her crew to the next world cup held in Norway.

John Newell
Mascouche 26C 1
Toronto

PS. If you received a facsimile of this earlier, my apologies. It vanished prior to my completing the email and I have not a clue where it went, if anywhere.

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The refinished water pump makes the 1981 Universal 16 look really grubby!