Impeller question: how often? - SailNet Community
 
LinkBack Thread Tools
post #1 of 9 Old 03-29-2010 Thread Starter
Senior Member
 
Join Date: Oct 2007
Location: Beacon Falls CT USA
Posts: 310
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
 
Impeller question: how often?

How often should you replace your raw water pump impeller?

I know the havoc it can cause if it breaks up. Fortunately my every 2 year replacement regimen has kept me from that fate. But is there a rule of thumb?

FYI, my engine is a 1993 Universal/Westerbeke M4-30 and I put about 100 hours on it every season in New England. If it matters in the reply, I typically use potable purple or pink antifreeze to winterize the boat, so the impeller is awash in that stuff all winter.
Pub911 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 9 Old 03-29-2010
Reward for lost Kraken!
 
hellosailor's Avatar
 
Join Date: Apr 2006
Posts: 11,481
Thanks: 5
Thanked 132 Times in 129 Posts
Rep Power: 11
   
Well, rubber part makers generally say they should be replaced every five years or sooner. Most boat folks would say to do it annually as part of annual maintenance because you can be sure it will still be good after just one year. And if it fails and a fin breaks off--that can go downstream and clog something, so better to do it too soon and just waste money. (!)

The quality of the rubber, the effect of the antifreeze...who knows. There was a company making higher price higher quality silicon impellers, don't know if they are still around but that might be worth looking into. All "rubber" isn't the same.
hellosailor is offline  
Quote Quick Reply Share with Facebook
post #3 of 9 Old 03-29-2010
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
I would recommend that every two years be a minimum for replacing the impeller. It depends....if you end up running the impeller dry for a bit, then make the replacement sooner...since that is likely to cause it to heat up, become brittle, and more likely to fail.

Sailingdog

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

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #4 of 9 Old 03-29-2010
Junior Member
 
Join Date: Mar 2008
Location: sherman tx
Posts: 29
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
water pump impeller

I replace my impeller every two years.I also have a unaversal engine I have installed a screen in the water line betwen the pump and the heat exchanger,catching broken parts of impeller.
gulftex is offline  
Quote Quick Reply Share with Facebook
post #5 of 9 Old 03-30-2010
Senior Member
 
BarryL's Avatar
 
Join Date: Aug 2003
Location: Long Island, NY
Posts: 1,807
Thanks: 4
Thanked 46 Times in 41 Posts
Rep Power: 12
 
Hi,

I don't have a scheduled replacement time. I check it in the spring and if it looks Ok I leave it alone. It is very easy for me to access the impeller, and i have spares, so changing it at any time is not difficult.

BTW, last spring I removed the impeller and inspected it. I saw the vanes were cracked at the root. I replaced with a new one. In July I had reduced flow from the exhaust. I removed the pump cover to find that on my 3 month old impeller, 2 vanes were missing and 2 more were cracked. The next impeller I installed was a Globe, made of different material.

Since it seems (to me anyway) that a new impeller is just as likely to fail as an older one, I don't see the benefit of changing every year (or every other year).

Lastly, I usually put about 50 hours on the diesel each year.

Barry

Barry Lenoble
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
BarryL is offline  
Quote Quick Reply Share with Facebook
post #6 of 9 Old 03-30-2010
Broad Reachin'
 
kwaltersmi's Avatar
 
Join Date: Aug 2006
Location: Grand Rapids, Michigan
Posts: 1,935
Thanks: 1
Thanked 17 Times in 17 Posts
Rep Power: 9
 
I just picked up an impeller kit on eBay and plan to add this to my annual list since the parts are inexpensive. You could also follow SD's 2 year minimum recommendation with a check of the current impeller's condition at haulout.

Catalina 34

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
kwaltersmi is offline  
Quote Quick Reply Share with Facebook
post #7 of 9 Old 03-30-2010
Senior Member
 
Join Date: Dec 2008
Posts: 711
Thanks: 1
Thanked 6 Times in 6 Posts
Rep Power: 7
 
Quote:
Originally Posted by BarryL View Post

Since it seems (to me anyway) that a new impeller is just as likely to fail as an older one, I don't see the benefit of changing every year (or every other year).
I agree especially now that many items are coming from China. During the winter months my impeller is sitting in antifreeze and I think that may prolong its life. I used to change the thing every two years or so until one year after about 3 months of use the new one failed. This was due to using a grease that was not compatible with the material in the impeller so I now use a dish water solution to lube the new impeller at start up.
lancelot9898 is offline  
Quote Quick Reply Share with Facebook
post #8 of 9 Old 03-30-2010
Senior Member
 
Maine Sail's Avatar
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,870
Thanks: 19
Thanked 217 Times in 165 Posts
Rep Power: 16
       
Quote:
Originally Posted by BarryL View Post
The next impeller I installed was a Globe, made of different material.


Barry
Barry,

I too tried the Globe impellers but found them very problematic. below are some quote and photos from another forum. My failures were the center hub spinning free of the blue impeller. This was a tough one to trouble shoot as it looked fine. The next one the tolerances were off ever so slightly and she would not "prime".


Images courtesy P. Shed

Quote:
Originally Posted by P. Shed
I was removing the sea water impeller from a M25 this morning . I do it each fall after haul out. To my surprise the impeller was cracked on every vane. This impeller was new this spring. The one I took out was a rubber type and was still like new but was old so changed it out . This is a # 815 . I would say there are only 35 hours on this impeller.


I will be taking it back tomorrow. Also going back to rubber type (black)

Sorry the pics are not the best
Images courtesy Bottomscraper:
Quote:
Originally Posted by Bottomscraper

I have been using the Globe Blue Run-Dry™ Impellers for years and I have been very happy with them. I usually remove them at the end of the season and they look almost new with a little discoloration. This year every single blade was cracked. I did notice that this year the center appears to be plastic rather than metal like the older ones. Here is a picture of the impeller I removed today after 1 season (about 120 hrs). It has never run dry.

It appears that they have changed materials and that these impellers are now junk. I guess I will be going back to the black ones also. Too bad they had a good product. I was considering using their motor mounts but I think I will look elsewhere.
Just an FYI that the Globe impellers are NOT all they are CRACKED up to be..

______
-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; 04-20-2010 at 08:25 AM.
Maine Sail is offline  
Quote Quick Reply Share with Facebook
post #9 of 9 Old 03-30-2010
DrB
Senior Member
 
Join Date: Mar 2007
Location: New England
Posts: 966
Thanks: 0
Thanked 7 Times in 7 Posts
Rep Power: 9
 
I change mine every spring before launch. It's like $8 and about 15 minutes to change. Peace of mind.

If you liked my advice/response, give me some rep points. If you didn't......well what do you expect, it was free.
DrB is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

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
Impeller replaced, but did I screw up? countrygent5201 Gear & Maintenance 17 02-24-2010 06:50 PM
2GMF Yanmar wp impeller question goletasailor Gear & Maintenance 6 11-19-2009 09:45 PM
Ladder question mcain Gear & Maintenance 14 08-03-2007 10:28 PM
Sherwood Impeller question langweer2 Gear & Maintenance 2 07-03-2006 12:05 AM
In Water diesel question? nauticalrich Gear & Maintenance 8 12-12-2002 05:57 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