Raw water pump help needed - SailNet Community
 2Likes
Reply
 
LinkBack Thread Tools
post #1 of 12 Old 12-31-2012 Thread Starter
Bristol 45.5 - AiniA
 
Join Date: May 2006
Posts: 3,789
Thanks: 5
Thanked 94 Times in 82 Posts
Rep Power: 10
 
Raw water pump help needed

I have just had my third raw water pump in four years die. Obviously I use me boat a lot but in the first 35 years of sailing never had to touch one. It is a Westerbeke 58, is there a trick I am missing eg lubrication or belt tension?

BTW, currently anchored in Plettenberg Bay and will sail to Mossel Bay overnight, if the predicted wind happens. It is only 60 miles but winds are light for the next two days before a 40 knot buster comes. If I can get the water pump replaced there should be a good window for going around Cape Agulhas.

Heading back to Lake Ontario for this summer. Ainia is back in North America for the first time since 2010. Currently in Long Island Sound.
killarney_sailor is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 12 Old 12-31-2012
Senior Member
 
jsaronson's Avatar
 
Join Date: Dec 2011
Posts: 966
Thanks: 5
Thanked 29 Times in 29 Posts
Rep Power: 4
 
Re: Raw water pump help needed

What part of the pump is failing? Seals? Bearings? Are you buying cheap rebuilts or new units?
Does the boat have the original alternator? Is there an alignment issue with the belt because of an upgraded alternator?
jsaronson is offline  
Quote Quick Reply Share with Facebook
post #3 of 12 Old 01-02-2013 Thread Starter
Bristol 45.5 - AiniA
 
Join Date: May 2006
Posts: 3,789
Thanks: 5
Thanked 94 Times in 82 Posts
Rep Power: 10
 
Re: Raw water pump help needed

The failures are of the seals along the shaft. When I bought the boat there were two spare pumps onboard which makes me think that this might be an ongoing problem. Could no tell if the ones I installed were rebuilds or not. When I did the last install I was very careful with alignment because I thought that this might be a problem. BTW, the alternator does not run off the same belts as the raw water pump. How tight should the belt be for the raw water pump?

Heading back to Lake Ontario for this summer. Ainia is back in North America for the first time since 2010. Currently in Long Island Sound.
killarney_sailor is offline  
Quote Quick Reply Share with Facebook
post #4 of 12 Old 01-02-2013
Senior Member
 
chucklesR's Avatar
 
Join Date: Sep 2007
Location: Pasadena Md - Magothy side
Posts: 5,979
Thanks: 10
Thanked 31 Times in 31 Posts
Rep Power: 10
     
Re: Raw water pump help needed

The belt should be precisely as tight as the manual says it should be.
http://www.westerbeke.com/OnlineManu...100_033507.pdf

That's 10 to 12mm of deflection when pressed at the center of the long side.
That's a tad less than a half inch for us American metric morons.
That's with 'normal' strength fingers - no gorilla standing on the belt.
Basically that's the same as every engine I've ever owned.
Too much tension can and does cause excess wear exactly as you've been seeing.
Too little tension can cause engine overheats.

If you aren't overheating or seeing signs of slippage loosen the belt, because you are seeing signs it's too tight.
jrd22 and Minnewaska like this.

Lessons learned are opportunities earned.
chucklesR is offline  
Quote Quick Reply Share with Facebook
post #5 of 12 Old 01-03-2013 Thread Starter
Bristol 45.5 - AiniA
 
Join Date: May 2006
Posts: 3,789
Thanks: 5
Thanked 94 Times in 82 Posts
Rep Power: 10
 
Re: Raw water pump help needed

That is about the tension I had on it. Hard to be sure since the distance between components is not nearly as large as with the double belts that service the alternator. I guess I just have to be very careful with the reinstall. At least I will know it is a new pump. I am going too rebuild the old one so I have a spare onboard (again).

Heading back to Lake Ontario for this summer. Ainia is back in North America for the first time since 2010. Currently in Long Island Sound.
killarney_sailor is offline  
Quote Quick Reply Share with Facebook
post #6 of 12 Old 01-03-2013
Junior Member
 
Join Date: Dec 2012
Location: England
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Send a message via Yahoo to Barrosa
Re: Raw water pump help needed

make sure to check the quality of the pump you are buying i think the quality is just bad which all pumps you are buying... i want to know that whether you have bought all these from same vendor or not........

.
Barrosa is offline  
Quote Quick Reply Share with Facebook
post #7 of 12 Old 01-03-2013
Senior Member
 
Join Date: Feb 2010
Location: Narragansett Bay
Posts: 10,837
Thanks: 45
Thanked 218 Times in 203 Posts
Rep Power: 7
   
Re: Raw water pump help needed

Quote:
Originally Posted by killarney_sailor View Post
....I am going too rebuild the old one so I have a spare onboard (again).
Rebuilding the old one is only good as an emergency spare, IMO. Malformed and poorly fitting seats are exactly why. They'll work fine for the time it takes to order and receive another new one. They are ridiculously expensive for a primitive pump, but new is the way to go.

Were your spares in their orginal OEM packaging? It doesn't prove anything, but its a clue.

My first thought, before you mentioned the possibility of using rebuilts, was also belt tension. If you somehow convince yourself the units were new, I would lighten it up a bit. You may need a new belt though.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Jeanneau 54DS

In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
Minnewaska is offline  
Quote Quick Reply Share with Facebook
post #8 of 12 Old 01-03-2013 Thread Starter
Bristol 45.5 - AiniA
 
Join Date: May 2006
Posts: 3,789
Thanks: 5
Thanked 94 Times in 82 Posts
Rep Power: 10
 
Re: Raw water pump help needed

Pumps are from Sherwood and were not in their packaging, but I tend not to keep packaging in any case since it does not stand up for months/years on a boat in constant use. Perhaps I am over-analyzing and will just do my best and not worry.

Heading back to Lake Ontario for this summer. Ainia is back in North America for the first time since 2010. Currently in Long Island Sound.
killarney_sailor is offline  
Quote Quick Reply Share with Facebook
post #9 of 12 Old 01-03-2013
Senior Member
 
MARC2012's Avatar
 
Join Date: Mar 2008
Posts: 594
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 8
 
Re: Raw water pump help needed

Many pumps have ferrous metal in the seals.I have had the same problem.keep plenty of spares.marc
MARC2012 is offline  
Quote Quick Reply Share with Facebook
post #10 of 12 Old 01-03-2013
Senior Member
 
Maine Sail's Avatar
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,791
Thanks: 18
Thanked 206 Times in 155 Posts
Rep Power: 16
       
Re: Raw water pump help needed

Quote:
Originally Posted by killarney_sailor View Post
I have just had my third raw water pump in four years die. Obviously I use me boat a lot but in the first 35 years of sailing never had to touch one. It is a Westerbeke 58, is there a trick I am missing eg lubrication or belt tension?

BTW, currently anchored in Plettenberg Bay and will sail to Mossel Bay overnight, if the predicted wind happens. It is only 60 miles but winds are light for the next two days before a 40 knot buster comes. If I can get the water pump replaced there should be a good window for going around Cape Agulhas.
Need more info...



What pump? - model #24102? If it is a 24102 it is a Sherwood and the Sherwood may be available for less money.

What is failing? Seals, bearings/bushings, shaft, impeller?

Have you measured flow?

What should the flow curve be at given RPM?

Are you hitting the "flow" Westerbeke says you should?

Does this share a belt with an alternator? IIRC it does not....

How tight is the belt? It should be just tight enough to not slip but nowhere as tight as the alt belt needs to be. In a short belt for a RWP 1/2" to 5/8" deflection when pressed in the center is usually sufficient. With an alt and a longer span you'd want to be closer 1/2" max...

Is the RWP above resting waterline?

______
-Maine Sail / CS-36T


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.




Images In Posts Property of Compass Marine Inc.



Last edited by Maine Sail; 01-03-2013 at 08:11 AM.
Maine Sail is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
replacement diaphram on bilge pump needed Gill L Gear & Maintenance 3 02-06-2012 06:44 PM
Water Pump nickmerc Atomic 4 6 01-24-2011 11:44 AM
Diverter needed between holding tank/macerator/deck pump out?? FishFinder Gear & Maintenance 9 06-12-2008 09:31 AM
Help Needed with Bilge Pump (Again) gpd955 General Discussion (sailing related) 26 09-01-2006 12:09 PM
Injector pump springs needed Seneca Gear & Maintenance 0 04-15-2003 11:20 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome