seawater system - Page 2 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
 Not a Member? 

Diesel This is a forum dedicated to diesel engines and their applicable accessories.


Like Tree1Likes
Reply
 
LinkBack Thread Tools
  #11  
Old 03-13-2014
boatpoker's Avatar
Senior Member
 
Join Date: Jul 2008
Location: Toronto
Posts: 1,053
Thanks: 8
Thanked 25 Times in 24 Posts
Rep Power: 7
boatpoker is on a distinguished road
Re: seawater system

Quote:
Originally Posted by Samuelmonosov View Post
I agree with minnewaska there must be a loose fitting or opening somewhere in the line that is allowing for the vacuum in the line. Does it immediately empty, or does it take its time? Does that water run back to the engine or through the exhaust line? Speaking of which, you may want to check the exhaust line and make sure that it doesn't exit below the strainer. That would create the vacuum issue you are experiencing.


Sent from my iPad using Tapatalk
The OP reported the issue resolved in post#7
__________________
Dirt People Scare me
Reply With Quote Share with Facebook
  #12  
Old 03-13-2014
RichH's Avatar
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,821
Thanks: 9
Thanked 73 Times in 66 Posts
Rep Power: 15
RichH will become famous soon enough
Re: seawater system

Quote:
Originally Posted by carlager View Post
The seawater strainer placed above sealevel and on the highest point on the seawater system on our Yanmar 3gm30f is empty when the engine is not running.

Is this normal ?
NO, its not normal as the contents of the strainer can drain-back and thus leave the strainer body full of air. If that slug of air reaches to the raw water pump, the pump may have difficulty 'priming itself' all the way to the pump ... especially as the pump normally wears/ages and the 'sides' of the pump vanes no longer 'seal' the impeller to the pump body vs. air. Once the pump and strainer are fully filled with water by the action of the pump, the water in the pump will make the proper seal to the sides; if the pump 'air leaks' past the impeller sides you may be running 'dry' pump for a long interval.

A strainer 'should' be below the waterline.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
slow drip, seawater pump ereiss Diesel 12 07-25-2012 08:23 PM
Engine seawater pump rebuild OceanNavigator Ocean Navigator 1 07-03-2012 02:04 PM
Battery Desalinates Seawater deow General Discussion (sailing related) 0 02-11-2012 01:27 PM
Using Seawater to cool Cabin DallasAB Gear & Maintenance 11 06-04-2007 10:55 PM
Freshwater to seawater ratio wanabe Cruising & Liveaboard Forum 30 04-24-2007 09:57 PM


All times are GMT -4. The time now is 04:26 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.