Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 06-12-2014, 10:38   #1
Registered User
 
callistov42's Avatar

Join Date: Jan 2011
Location: Seabrook, Texas
Boat: Vagabond 42
Posts: 169
Lost impeller blades

Started up my 4jh5e Yanmar last Sunday and no water coming out of exhaust. Removed water pump cover and every blade on impeller gone. Replaced impeller, exhaust made water and we went from St Martin to Anguilla and back, no problems. I can not figure out how to open up Yanmar heat exchanger to try to find impeller blades. Do I need to? Westerbeke heat exchanger is easy (remove the ends). How do you get into a Yanmar heat exchanger?
__________________

__________________
callistov42 is offline   Reply With Quote
Old 06-12-2014, 13:14   #2
Registered User
 
wingless's Avatar

Join Date: Aug 2013
Boat: 2000 Searay 380 Sundancer
Posts: 487
Re: Lost impeller blades

Here is the specification sheet for the Yanmar 4JH4E.

On my engines, when the impeller blades break off, the bits are captured at the first heat exchanger.

When I replace the impeller, I also remove the raw water hoses from both ends of that first heat exchanger. I then use a garden hose to reverse flush the bits out of that first heat exhanger.

Then I gather all the bits for a "reassembly" to ensure all the bits have been retrieved.
__________________

__________________
2000 SeaRay 380 Sundancer Mercruiser
454 MAG MPI Horizon 380hp / Westerbeke 7.0KW BCGB
many cool mods
wingless is offline   Reply With Quote
Old 06-12-2014, 13:17   #3
Senior Cruiser
 
Vasco's Avatar

Cruisers Forum Supporter

Join Date: Apr 2004
Location: Toronto
Boat: CS36Merlin, "La Belle Aurore" Ben393 "Breathless"
Posts: 7,140
Re: Lost impeller blades

The blades are probably in the oil cooler at the back of the engine. Fairly easy to get at.
__________________
Rick I
Toronto in summer, Bahamas in winter.
http://groups.yahoo.com/group/beneteau393/
Vasco is offline   Reply With Quote
Old 06-12-2014, 13:22   #4
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,369
Re: Lost impeller blades

This a where a good pair of medical forceps comes in handy. Every boat should have them!
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 06-12-2014, 15:16   #5
Registered User

Join Date: Oct 2009
Location: australia
Posts: 467
Re: Lost impeller blades

Take a look back down the inlet hose pieces also find their way down there.
__________________
shakey doug is offline   Reply With Quote
Old 06-12-2014, 15:56   #6
Registered User
 
deblen's Avatar

Join Date: Oct 2014
Location: Grand Manan,N.B.,Canada N44.40 W66.50
Boat: Mascot 28 pilothouse motorsailer 28ft
Posts: 1,403
Images: 1
Re: Lost impeller blades

Install a water strainer right after RW pump.
__________________
deblen is offline   Reply With Quote
Old 06-12-2014, 16:18   #7
Registered User
 
Stu Jackson's Avatar

Join Date: Jan 2011
Location: Cowichan Bay, BC (Maple Bay Marina)
Posts: 6,389
Re: Lost impeller blades

Quote:
Originally Posted by deblen View Post
Install a water strainer right after RW pump.
...or change the impellers more often before they disintegrate.

Your boat, your choice.
__________________
Stu Jackson
Catalina 34 #224 (1986) C34IA Secretary
Cowichan Bay, BC, (Maple Bay Marina) SR/FK, M25, Rocna 10 (22#) (NZ model)
Stu Jackson is offline   Reply With Quote
Old 06-12-2014, 16:31   #8
Long Range Cruiser
 
MarkJ's Avatar

Cruisers Forum Supporter

Join Date: Dec 2007
Location: Australian living on "Sea Life" currently in England.
Boat: Beneteau 393 "Sea Life"
Posts: 12,828
Images: 25
Re: Lost impeller blades

Quote:
Originally Posted by Cheechako View Post
This a where a good pair of medical forceps comes in handy. Every boat should have them!
Dont mention to your wife you are using her forceps in the oil cooler
__________________
Notes on a Circumnavigation.
OurLifeAtSea.com

Somalia Pirates and our Convoy
MarkJ is offline   Reply With Quote
Old 27-12-2014, 04:15   #9
Registered User
 
Akapeterc's Avatar

Join Date: Oct 2011
Location: Lake Macquarie, Australia
Boat: Hunter 44DS
Posts: 184
Re: Lost impeller blades

I just changed my impeller today and again discovered almost all of the blades were broken of, I got them all out of the oil cooler plus a few more as well as one large one in the intake area of the pump. It is only 10 months, 160hrs since I last changed and the last one was the same. Any ideas why I would be chewing up the impellers? In the manual it says to change every 1000hrs.


Sent from my iPad using Cruisers Sailing Forum
__________________
Akapeterc is offline   Reply With Quote
Old 27-12-2014, 04:21   #10
Senior Cruiser
 
Vasco's Avatar

Cruisers Forum Supporter

Join Date: Apr 2004
Location: Toronto
Boat: CS36Merlin, "La Belle Aurore" Ben393 "Breathless"
Posts: 7,140
Re: Lost impeller blades

Quote:
Originally Posted by Akapeterc View Post
I just changed my impeller today and again discovered almost all of the blades were broken of, I got them all out of the oil cooler plus a few more as well as one large one in the intake area of the pump. It is only 10 months, 160hrs since I last changed and the last one was the same. Any ideas why I would be chewing up the impellers? In the manual it says to change every 1000hrs.


Sent from my iPad using Cruisers Sailing Forum
Don't know your sailing area but does the boat sit on the bottom frequently or sail in waters with a lots of stirred up sand?
__________________
Rick I
Toronto in summer, Bahamas in winter.
http://groups.yahoo.com/group/beneteau393/
Vasco is offline   Reply With Quote
Old 27-12-2014, 04:40   #11
Registered User
 
Akapeterc's Avatar

Join Date: Oct 2011
Location: Lake Macquarie, Australia
Boat: Hunter 44DS
Posts: 184
Re: Lost impeller blades

It definitely doesn't sit on the bottom but I did touch bottom going over a bar recently. Sailing along the Australian east coast at present.


Sent from my iPad using Cruisers Sailing Forum
__________________
Akapeterc is offline   Reply With Quote
Old 27-12-2014, 05:29   #12
Registered User

Join Date: Oct 2011
Location: Canada
Boat: CT 56
Posts: 418
Images: 3
Send a message via Skype™ to undercutter
Re: Lost impeller blades

Quote:
Originally Posted by Akapeterc View Post
It definitely doesn't sit on the bottom but I did touch bottom going over a bar recently. Sailing along the Australian east coast at present.


Sent from my iPad using Cruisers Sailing Forum
Sounds like your water pump may be worn out internally. Our Jabsco gear driven water pump on a Perkins engine would not last more than 40 hours of use before the impeller failed. Try either rebuilding or replacing the pump. If you rebuild be sure to replace all the internal parts including bearings, thrust washer and compression plate. I couldn't believe the amount of wear and tear that existed after comparison to the new pump.

Also impellers do not like to sit for long periods of time nor do they like to run dry as they overheat and become brittle. Make sure you have a good flow of seawater at the inlet head. Clean screens regularly and make sure thruhulls are not clogged.
__________________
undercutter is offline   Reply With Quote
Old 27-12-2014, 09:29   #13
Registered User

Join Date: Nov 2014
Posts: 608
Re: Lost impeller blades

Undercutter's comments about checking your water intake are important. Frequently excess depression on the intake side of the pump results in impeller blades being torn off from the suction. Make sure the thru hull fitting is adequately sized and not blocked, and the water feed to the pump has a minimum number of elbows ,etc.

Torn off blades is seen frequently on saildrive where the water passages in the drive are not keep clean.

DougR
__________________
DougR is offline   Reply With Quote
Old 27-12-2014, 15:46   #14
Registered User
 
Akapeterc's Avatar

Join Date: Oct 2011
Location: Lake Macquarie, Australia
Boat: Hunter 44DS
Posts: 184
Re: Lost impeller blades

Thanks for all that information


Sent from my iPhone using Cruisers Sailing Forum
__________________

__________________
Akapeterc is offline   Reply With Quote
Reply

Tags
lost

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Want To Buy: Exhaust Fan Blades for a Nicro Solar Vent ocean31 Classifieds Archive 13 10-07-2010 09:06
Custom Blades for Air-X boat_alexandra Electrical: Batteries, Generators & Solar 0 13-04-2010 21:33
Lost Thrust! Lost Prop? OffSeason Monohull Sailboats 20 07-06-2009 00:57
Where to find the right replacement blades JoSchmaltz Electrical: Batteries, Generators & Solar 6 27-08-2008 03:11
Two blades or three? Kai Nui Propellers & Drive Systems 26 15-03-2007 23:36



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 21:30.


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.