Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 07-06-2009, 07:15   #16
CF Adviser
Moderator Emeritus
 
Hud3's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: Virginia
Boat: Island Packet 380, now sold
Posts: 8,929
Images: 49
Here's a diagram showing all the exhaust components that GordMay posted a while back. It shows the syphon break and the various clearances vs. water level.
Attached Thumbnails
Click image for larger version

Name:	79exhaust_davegerr-med.jpg
Views:	156
Size:	183.5 KB
ID:	8441  
__________________

__________________
Hud
Hud3 is offline   Reply With Quote
Old 08-06-2009, 09:03   #17
Registered User

Join Date: May 2009
Posts: 15
pics of the problem

Heres a few pics of my exhaust and a diagram with measurements...

Ok well things are getting a little clearer on the problem, I gotta sit down tonite and add up the numbers but it looks like aside from no vent there are other issues as well.

On the good side, I have found a good low "mileage "(5000) head from a wrecked turbo car in a shop in vermont, it's in route now for $460, with a new set of stretch headbolts, $75. and the new gasket is here from CA $150. Turns out that the Vetus Co. was really the only hard ones to deal with for parts..they just said not available,.. this IS a HD popular diesel everywhere but here.

I guess all things considered, $700 on a major repair for a 42' home to be is not that bad if all goes well,..still ouch.

I will get this system set right but will be looking for other options as far as separating the exhaust from the raw water,.. i don't like the whole idea.

the P/O told me yesterday that years ago, sitting at a dock, he had the older engine, before this one, get salt water in the engine when large seas from the stern filled the pipe.. the motor was pumped and flushed but it was a problem then sitting as well as when running.
BAD DESIGN!

Thanks for all the input, so far,.. this group rocks...kev

OK the pics wont go, says invalid post, I'll try on a another reply..K
__________________

__________________
kevman1421 is offline   Reply With Quote
Old 08-06-2009, 09:12   #18
Registered User

Join Date: May 2009
Posts: 15
pics of the problem 2

here we go again
Attached Thumbnails
Click image for larger version

Name:	DSCN0473.jpg
Views:	117
Size:	325.7 KB
ID:	8468   Click image for larger version

Name:	DSCN0470.jpg
Views:	108
Size:	500.7 KB
ID:	8470  

Click image for larger version

Name:	DSCN0468.jpg
Views:	89
Size:	474.3 KB
ID:	8471   Click image for larger version

Name:	DSCN0288.jpg
Views:	102
Size:	475.1 KB
ID:	8472  

Click image for larger version

Name:	DSCN0474.jpg
Views:	88
Size:	447.7 KB
ID:	8473   Click image for larger version

Name:	DSCN0471.jpg
Views:	96
Size:	503.4 KB
ID:	8474  

__________________
kevman1421 is offline   Reply With Quote
Old 09-06-2009, 14:14   #19
Registered User

Join Date: May 2009
Posts: 15
Side exhaust to shorten the run???

I had a diesel mechanic friend come by today and have a look.

he sugested that I might be better off to shorten th exhaust run by exiting out the side of the boat with a proper riser so not to get flooded when healing, maybe a scoop facing aft.
he said its unusual but so is this boat and it might help out the problem of pumping so much water up a 13' pipe and out.

I could half the plumbing length if I did this.

I had not even considered this and the only bummer might be catching exhaust fumes when motoring since the outlet would be ahead of the pilot house.

He also suggested downsizing the exhaust to the minimum diameter suitable for this engine, that way the exhasut is actually pumping the water out with abit of pressure.
My pipe size is 2 & 3/8" (60mm) ID, smaller hose is less expensive, easier to manipulate and may help out... he also believes the volume on the aft side of the muffler is probably too much and there may well be a siphon problem since there is no vent,... HMMM a bad design it seems.
Kev
__________________
kevman1421 is offline   Reply With Quote
Old 10-06-2009, 15:32   #20
Registered User
 
mesquaukee's Avatar

Join Date: Jun 2009
Location: Western Caribbean & ocassionaly inCanada
Boat: Mesqua Ukee, Buccaneer 40 (Salar 40)
Posts: 480
The problem you have definitly needs what is called a riser. It is attached to the exhaust manifold. It "rises" up to well above the waterline then loops back down. The cooling water is injected into the downward section.
It can be made out of threaded black or galvanized pipe. An elbow is welded onto a steel plate that is shaped to bolt onto the exhaust manifold. A pipe nipple of appropriate length screws into this, then two elbows at the top and another nipple going back down. The cooling water injector, a piece of 1/2" or so stainless pipe, is welded into a hole in the downward section. All of this pipe has to be wrapped with at least a 1/2" layer of heat wrap (that white cloth like material).
Due to corrosion the downward section where the saltwater is injected needs replacing every 5 years or so in the tropics.
It may not look pretty but it keeps any or all water from flowing back through the exhaust.
If your raw water pump leaks a little it is impossible for any water to run into the cylinders. If your raw water pumps leaks replace the vanes immediately. If it still leaks check the cover plate. If there is a ridge in it the body of the pump is worn out. Get a new one or one day soon you will have overheating problems.
__________________
mesquaukee is offline   Reply With Quote
Old 11-06-2009, 15:39   #21
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,363
Yes on the riser

Yes on the riser: many engine makers make a riser for this type of application. Or you can put one on at the exit. (Beta marine shown)
__________________
Cheechako is offline   Reply With Quote
Old 11-06-2009, 15:42   #22
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,363
system layout

here's a diagram of the exit riser....
__________________
Cheechako is offline   Reply With Quote
Old 12-06-2009, 19:59   #23
Registered User

Join Date: Oct 2006
Location: Nanaimo, BC
Boat: C&C 41
Posts: 346
Where are you? If somewhere hot, there is a distinct possibility that if the boat is not run often, the water in the exhaust system gets evaporated by the heat of the day and the vapors enter the engine through the exhaust valves.
__________________
Rex Delay is offline   Reply With Quote
Old 14-06-2009, 09:45   #24
Registered User

Join Date: Feb 2009
Posts: 1,321
Here are some more pictures from Vetus.
I own a muffler but did not use it, save on some joints.
The goose neck does a good job of bringing the exaust to the maximum possible high. If you need more pics of risers, I can supply.
By the way do not connect town pressure to engine, the pressure is to high and you can blow some gaskets.
Attached Thumbnails
Click image for larger version

Name:	vetus1.jpg
Views:	103
Size:	451.4 KB
ID:	8550   Click image for larger version

Name:	vetus2.jpg
Views:	99
Size:	475.2 KB
ID:	8551  

Click image for larger version

Name:	vetus3.jpg
Views:	99
Size:	356.5 KB
ID:	8552   Click image for larger version

Name:	vetus4.jpg
Views:	97
Size:	440.9 KB
ID:	8553  

__________________

__________________
chala is offline   Reply With Quote
Reply

Tags
exhaust, raw 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
Raw-water to fresh-water cooling conversion Catamount Engines and Propulsion Systems 31 06-05-2012 08:29
Water in Cylinders - Yanmar 3GM mike_hancock Engines and Propulsion Systems 14 02-06-2009 12:25
raw water strainers seaweedII Plumbing Systems and Fixtures 3 21-12-2008 07:23
Raw water pump bcguy Engines and Propulsion Systems 6 10-06-2007 12:11
Hot Water Cylinders Spirit28 Plumbing Systems and Fixtures 4 29-04-2007 05:08



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 07:17.


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.