Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 10-12-2013, 19:33   #1
Guy
Registered User

Join Date: Feb 2013
Location: So. Oregon, USA
Boat: Seafarer36c
Posts: 4,308
Water Lift Flow Problem

After some rough sailing there is no water flow through the exhaust when you start the engine. I remove the outlet hose from the heat exchanger and get some flow, re-connect the hose and all is well. I have checked the hoses and the vented loop and all is well. The engine temp is fine when water is flowing. The amount of water coming from the exhaust seems normal when the system is working. The salt water pump has a new impeller and cam.
This problem is new this for this cruise.
__________________

__________________
Guy is offline   Reply With Quote
Old 10-12-2013, 19:55   #2
Marine Service Provider

Join Date: Oct 2011
Posts: 1,205
Re: water lift flow problem

VARMETS

Quote:
Originally Posted by Guy View Post
After some rough sailing there is no water flow through the exhaust when you start the engine. I remove the outlet hose from the heat exchanger and get some flow, re-connect the hose and all is well. I have checked the hoses and the vented loop and all is well. The engine temp is fine when water is flowing. The amount of water coming from the exhaust seems normal when the system is working. The salt water pump has a new impeller and cam.
This problem is new this for this cruise.
__________________

__________________
FlyingCloud1937 is offline   Reply With Quote
Old 11-12-2013, 05:10   #3
Bailing as fast as I can.
 
GILow's Avatar

Join Date: Sep 2008
Location: Adelaide, South Australia
Boat: Swanson 42
Posts: 3,585
Re: water lift flow problem

Quote:
Originally Posted by Guy View Post
After some rough sailing there is no water flow through the exhaust when you start the engine. I remove the outlet hose from the heat exchanger and get some flow, re-connect the hose and all is well. I have checked the hoses and the vented loop and all is well. The engine temp is fine when water is flowing. The amount of water coming from the exhaust seems normal when the system is working. The salt water pump has a new impeller and cam.
This problem is new this for this cruise.
This is odd. I just read about something similar with the Sydney Hobart in 1998. In the interview they reckoned the engine overheated as the pickup point was sucking air from time to time during the big waves.

When I read that I thought it was highly improbable, I would have thought the raw water pump would have self primed again practically instantly, but could this be the case for you? When you say "rough sailing" is it possible the boat is healing over enough to suck air in to the pickup and if so, does this stop the water flow until you effectively bleed it again by removing the outlet hose and thus removing a bit of the head or some minor back pressure?


Matt
__________________
GILow is offline   Reply With Quote
Old 11-12-2013, 05:52   #4
Registered User
 
Ziggy's Avatar

Join Date: Apr 2008
Location: U.S., Northeast
Boat: Contessa 32
Posts: 1,421
Images: 2
Re: water lift flow problem

Put some vaseline or silicone grease on the impeller and see if that helps. Raw water pumps can definitely loose prime (personal experience).
__________________
... He knows the chart is not the sea.
-- Philip Booth, Chart 1203
Ziggy is offline   Reply With Quote
Old 11-12-2013, 06:42   #5
Neo
Registered User
 
Neo's Avatar

Join Date: Dec 2009
Location: Salem, MA
Boat: Pearson 31
Posts: 535
Re: water lift flow problem

Hmm. I learn something new every day. Never would have thought that could happen.
__________________
Neo
Neo is offline   Reply With Quote
Old 11-12-2013, 06:45   #6
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: water lift flow problem

Loss of prime. Check the strainer next time to see if it's full.
__________________
Rick I
Toronto in summer, Bahamas in winter.
http://groups.yahoo.com/group/beneteau393/
Vasco is offline   Reply With Quote
Old 11-12-2013, 07:22   #7
Guy
Registered User

Join Date: Feb 2013
Location: So. Oregon, USA
Boat: Seafarer36c
Posts: 4,308
Re: water lift flow problem

Those are all good points. As I think back on this, the strainer has been empty during these episodes. If I crack the bowl it fills immediately but I'm not sure the system starts pumping right away until remove a hose downstream. My thinking was if the strainer can get water that was not the problem but maybe the pump is loosing prime and if I just waited a moment the system would have started pumping.
Could this be caused by a leaking gasket in the strainer? There is no sign of any water leak but perhaps air could be getting in?
I'm not sure the boat was rolling enough to uncover the inlet as it is pretty far down, but maybe.
__________________
Guy is offline   Reply With Quote
Old 11-12-2013, 08:14   #8
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: Water Lift Flow Problem

Had similar symptoms some years ago, and the culprit for us turned out to be a worn cover plate on the vane pump. Reversing the cover (at least on that particular Johnson pump) gave a fresh surface, and the symptoms disappeared.

Just another thing to check...

Good luck

Jim
__________________

__________________
Jim and Ann s/v Insatiable II , lying Port Cygnet, Tasmania once again
Jim Cate is offline   Reply With Quote
Reply

Tags
lift, water

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
Replace water tank or disinfect it? omgitsgela Provisioning: Food & Drink 14 06-06-2013 07:57
If You Don't Drink the Water? thompsonisland Provisioning: Food & Drink 174 09-11-2012 17:18
Cleaning the Fresh Water System off-the-grid Plumbing Systems and Fixtures 52 16-07-2012 05:30
Engine Cooling - Oversized Hose or No? cas206 Engines and Propulsion Systems 40 11-06-2012 09:19
Impeller / Sea Water Pump Problem in Volvo MD2040 hoaga Engines and Propulsion Systems 6 08-08-2011 14:59



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 11:57.


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.