Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 18-09-2010, 05:22   #1
Registered User

Join Date: Sep 2010
Location: Carlisle
Boat: Moody 42 (CC) Ketch
Posts: 9
Water in Engine

I have found that water has been seeping into the engine from the exhaust valves once the engine has been stopped. The perkins 4108 is low in the boat (Claymore 30 motor sailor) and I have fitted a non return box in the lowest part of the engine space for the top half of the exhaust water but the water from the manifold to the non return box runs with a limited gradient. This means that when the engine is stopped the last blow of water and exhaust almost fills the low level pipe and has slopped back up the manifold and into the engine. Does anyone know of a fitting that would easily allow me to drain off this water when I stop the engine which would make sure that I dont have a repeat of the problem.
Any slight continued flow of cooloing water from the outside seacock, through the impellor and across the heat exchanger will soon fill up the pipe to the non return valve. This means I already have to rremember to turn off the sea cock immediately I stop the engine to prevent the flow back of water. Another jog of puliing some king of drain plug would not be an extra burden.
Any ideas.
__________________

__________________
old bradders is offline   Reply With Quote
Old 18-09-2010, 05:28   #2
Registered User

Join Date: Dec 2009
Posts: 3,016
Images: 4
Ouch! That is bad. Even the steam from the last water can be bad. How about shutting off the water a few seconds before you kill the engine? Otherwise you'll need to move the water injection further downhill from the manifold.
__________________

__________________
daddle is offline   Reply With Quote
Old 18-09-2010, 07:55   #3
Registered User
 
James S's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: Yemen & Lebanon... the sailboat is in Lebenon, the dhow is in Yemen
Boat: 1978 CT48 & 65ft Cargo Dhow
Posts: 5,816
Images: 139
We've got some good diagrams of some exhaust system dimension parameters in previous threads.
I've looked and so far haven't found them but I'll keep looking.
This is a serious problem that could have catastrophic consequences if not dealt with properly.
__________________
James
S/V Arctic Lady
I love my boat, I can't afford not to!
James S is offline   Reply With Quote
Old 18-09-2010, 08:19   #4
Senior Cruiser
 
osirissail's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: A real life Zombie from FL
Boat: Gulfstar 53 - Osiris
Posts: 5,416
Images: 2
Quote:
Originally Posted by old bradders View Post
. . .
Any slight continued flow of cooloing water from the outside seacock, through the impellor and across the heat exchanger will soon fill up the pipe to the non return valve. This means I already have to rremember to turn off the sea cock immediately I stop the engine to prevent the flow back of water. Another jog of puliing some king of drain plug would not be an extra burden.
Any ideas.
You have several serious problems. But I don't understand how you are getting any water flow past the engine raw water pump. The impeller system is a positive displacement pump and will not pass any water when it is not rotating. If it does then you are missing an awful lot of vanes from the impeller - or - the impeller is the wrong size - or - the body of the raw water pump is worn out.

- - As to the exhaust installation you seem to be missing some important parts like a water-lock muffler. For a simple example of the exhaust on a low mounted engine see: EXHAUST INSTALLATION
Here is a larger size diagram of the parts and measurements (250mm = 10 inches) -
Attached Thumbnails
Click image for larger version

Name:	boatexh.jpg
Views:	72
Size:	40.8 KB
ID:	19366  
__________________
osirissail is offline   Reply With Quote
Old 18-09-2010, 10:31   #5
Registered User
 
James S's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: Yemen & Lebanon... the sailboat is in Lebenon, the dhow is in Yemen
Boat: 1978 CT48 & 65ft Cargo Dhow
Posts: 5,816
Images: 139
Thats the drawing I was looking for....thanks osirissail.
__________________
James
S/V Arctic Lady
I love my boat, I can't afford not to!
James S is offline   Reply With Quote
Reply

Tags
engine

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
Connecting Raritan Water Heater to Engine edwmama Off Topic Forum 8 28-08-2010 21:02
Water Flooding Engine in Following Seas RDW Monohull Sailboats 11 31-01-2010 20:52
Size of Engine Intake Water Hose ? Panamajames Monohull Sailboats 9 05-11-2009 21:57
Engine-Heated Water Heater Fishman_Tx Plumbing Systems and Fixtures 15 17-08-2009 08:28
Water in Engine Bilge (Willard) MV Construction, Maintenance & Refit 7 15-04-2009 10:58



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 10:19.


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.