Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 08-11-2007, 08:03   #1
Registered User
 
rdempsey's Avatar

Join Date: Jul 2007
Location: Ladner, BC, Canada
Boat: Newport 30
Posts: 101
Excess Steam / Anti-siphon valve

My "new" boat seems to have excess steam coming from the exhaust. Would this mean it is running too hot? The heat exchanger is topped up. What should be checked? I was thinking the raw water impeller, intake and filter.
Engine is a Yanmar 2GM20F.
It runs smooth with no power loss.

Also, there does not seem to be an anti-siphon valve. The engine was rebuilt 50 hours ago because of an "exhaust problem where water got in the engine".
Am I going to have the same problem? Am including a pic of the exhaust.
Attached Thumbnails
Click image for larger version

Name:	tmpphp8IIMm6.jpg
Views:	133
Size:	15.6 KB
ID:	2062  
__________________

__________________
SV Lorelei
"If you don't have anything nice to say,
then don't say anything"
rdempsey is offline   Reply With Quote
Old 08-11-2007, 10:16   #2
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
In the picture, the short hose on the left side, is that your exhaust cooling line????

If so, It's on the wrong side. It should be on the downward side and not the upward side. If it was like that before the rebuild that could how the water got in the motor. The cooling line is suppose to cool the exhaust outlet, only. Water spraying into the direct heat would cause steam.

Another thing too! There should not be a rubber hose so close to the outlet like on the right side. There should be more metal (to be cooled) leading down to an oulet tube. It looks like a bad set up to me!

As for a riser, that depends on where the motor is in relation to the waterline.

__________________

__________________
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
Old 08-11-2007, 10:37   #3
Registered User
 
rdempsey's Avatar

Join Date: Jul 2007
Location: Ladner, BC, Canada
Boat: Newport 30
Posts: 101

Quote:
Originally Posted by delmarrey View Post
In the picture, the short hose on the left side, is that your exhaust cooling line????
The short hose is raw water going from the heat exchanger on the left, to the exhaust elbow.
It looks like the elbow is on backwards doesn't it?
__________________
SV Lorelei
"If you don't have anything nice to say,
then don't say anything"
rdempsey is offline   Reply With Quote
Old 08-11-2007, 11:02   #4
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
Quote:
Originally Posted by rdempsey View Post
The short hose is raw water going from the heat exchanger on the left, to the exhaust elbow.
It looks like the elbow is on backwards doesn't it?
Yes! I think I would replace the whole unite!

This is a bad example but the cooling is set up properly and worked for 25 years.
Attached Thumbnails
Click image for larger version

Name:	silencer1.JPG
Views:	124
Size:	86.9 KB
ID:	2063  
__________________
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
Old 08-11-2007, 11:05   #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
BTW

This is how it is set up now.
Attached Thumbnails
Click image for larger version

Name:	40engrear.JPG
Views:	124
Size:	92.7 KB
ID:	2064  
__________________
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
Old 08-11-2007, 13:23   #6
Senior Cruiser
 
S/V Antares's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: Annapolis, Bahamas
Boat: 1983 Gulfstar 36
Posts: 1,249
Images: 1
The elbow is a jacketed exhaust. The water actually exits on the downard side to the right. They are notorious for getting clogged or restricted. Then the lack of flow causes steam. You should have an antisiphon valve installed asap and remove and inspect the elbow. If it is more than 5 years old dump it.
__________________

__________________
Will & Muffin
Lucy the dog

"Yes, well.. perhaps some more wine" (Julia Child)
S/V Antares 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
white smoke or steam limmer Engines and Propulsion Systems 18 02-10-2007 22:56
The always dripping anit-siphon value?? Paul L Engines and Propulsion Systems 4 07-03-2007 10:57
Exhaust anti-siphon etc. tyrol Construction, Maintenance & Refit 11 19-01-2007 15:34
Tropical Storm Picks Up Steam Off Florida CaptainK Atlantic & the Caribbean 0 12-06-2006 08:44
Vetus anti-siphon valve Curtis Engines and Propulsion Systems 9 21-12-2005 00:48



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 09:10.


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.