Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 29-01-2013, 12:26   #1
Registered User
 
HoppySailor's Avatar

Join Date: Apr 2011
Location: Montana
Boat: 1989 Cabo Rico 34
Posts: 67
Strainers to protect from failed impellers

We recently purchased a Cabo Rico 34 with a Yanmar 3GM30F engine. The seawater strainer for engine cooling is between the through hull and the seawater cooling pump. I've read horror stories about impellers failing and having to pick bits of rubber out of the cooling system so I was investigating getting a simple strainer to insert on the outlet side of the seawater pump to catch the impeller bits before they reach the heat exchanger. As I was thinking it through, I got to thinking about the impeller in the pump on the closed side of the cooling system (anti-freeze side). A failed impeller there and impeller bits can end up in the engine cooling passages. Anyone install strainers on the downstream side of either of these pumps? Am I over thinking this?
__________________

__________________
Ron
1989 Cabo Rico 34 "Jiibay Na Noodin"
HoppySailor is offline   Reply With Quote
Old 29-01-2013, 12:34   #2
Senior Cruiser
 
Jim Cate's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 11,471
Re: Strainers to protect from failed impellers

Ron, in most engines the freshwater circulating pump is not a rubber impeller type, so it isn't an issue. A strainer in the raw water side after the pump isn't a bad idea. I think that it should be large enough that a few blades wouldn't block the flow too much -- the combination of lower pressure due to missing blades and additional restrictions in the piping would lead to overheating quickly.

Cheers,
Jim
__________________

__________________
Jim and Ann s/v Insatiable II , lying Port Cygnet, Tasmania once again
Jim Cate is offline   Reply With Quote
Old 29-01-2013, 12:54   #3
Registered User
 
HoppySailor's Avatar

Join Date: Apr 2011
Location: Montana
Boat: 1989 Cabo Rico 34
Posts: 67
Re: Strainers to protect from failed impellers

Thanks Jim. I assumed that the freshwater pump also used a rubber impeller. I just had a look at the Yanmar service manual and the frehwater pump does not appear to use a rubber impeller. I'll just proceed with a strainer after the seawater pump. Thanks again for your help.
__________________
Ron
1989 Cabo Rico 34 "Jiibay Na Noodin"
HoppySailor is offline   Reply With Quote
Old 30-01-2013, 12:46   #4
Registered User
 
c.spots's Avatar

Join Date: Jul 2007
Location: Now in Davao, the Philippines.
Boat: Leopard 40 catamaran
Posts: 121
Send a message via Skype™ to c.spots
I installed a screen just downstream of the seawater impeller. I couldn't find a large mesh screen, so drilled holes in the screen to assure good water flow. It has a clear window, and I painted the inside yellow - to make it easy to see any impeller bits. I don't know, but suspect that impellers fail a blade at a time, so when I see any rubber bits, the impeller gets changed.
__________________
Robert W.
c.spots
www.changingspots.net

Life shouldn't be a race to the finish line - enjoy the journey.
c.spots is offline   Reply With Quote
Old 30-01-2013, 13:05   #5
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
Re: Strainers to protect from failed impellers

If you're that paranoid I would put in one of theses.....



But in think it's over kill. If you change out the impeller on regular maintenance schedules there shouldn't be a problem. Over heating can cause failures too. So if you forget to open the seacock, replace the impeller too.
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!

Unprepared boaters, end up as floatsum!.......
delmarrey is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 06:12.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.