Ink black exhaust water - soot? - Page 4 - SailNet Community
 3Likes
Reply
 
LinkBack Thread Tools
post #31 of 47 Old 06-01-2011
Senior Pirate
 
TropicCat's Avatar
 
Join Date: Oct 2008
Location: Cape Canaveral, FL
Posts: 2,628
Thanks: 5
Thanked 14 Times in 14 Posts
Rep Power: 7
 
I own a boat with 2 Yanmars and would like to suggest something no one else has mentioned.

My engines are very sensitive when using old diesel fuel. In fact it causes the symptom you mention. I would suggest a cheap fix by tossing a couple of gallons of new diesel in the tank and add a stabilizer. I use 2 stabilizers.

Stabil to extend the fuel life and Diesel Clean to add the lubosity lost in our low sulfur diesel fuel at the pumps these days.

It can't hurt.

Tropic Cat

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
TropicCat is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #32 of 47 Old 06-01-2011 Thread Starter
Member
 
sandycohen's Avatar
 
Join Date: Dec 2009
Location: New Orleans, LA
Posts: 59
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
Hi TropicCat - Thanks for the input. Unfortunately I can report that I put about 5 gallons of new, marina grade diesel in with an additive last month, and the tank is only about 20 gallons so that's a pretty good share.
sandycohen is offline  
Quote Quick Reply Share with Facebook
post #33 of 47 Old 06-02-2011
Senior Slacker
 
SlowButSteady's Avatar
 
Join Date: Feb 2010
Location: SoCal
Posts: 4,223
Thanks: 0
Thanked 17 Times in 15 Posts
Rep Power: 6
 
Tropic Cat may still be on the right track. Diesel fuel will polymerize as it ages. This makes it burn more slowly and often results in incomplete combustion (basically, the longer the molecular chains the slower a hydrocarbon will burn). Adding some new diesel will help, but if there is enough really old fuel in the tank the soot could be a result of this incomplete combustion of old diesel. Microbial growth in the tank will make things even worse.

I would take a look at a sample of the fuel from the tank and compare it to some fresh diesel. If the difference in clarity is dramatic (as in, one look makes you wonder how the engine ran at all), replacing ALL the fuel and cleaning the tank may be in order.

Never forget them. Do something to prevent it from happening again.
Charlotte Bacon, Daniel Barden, Rachel Davino, Olivia Josephine Gay, Ana M. Marquez-Greene, Dylan Hockley, Dawn Hochsprung, Madeleine F. Hsu, Catherine V. Hubbard, Chase Kowalski, Jesse Lewis, James Mattioli , Grace McDonnell, Anne Marie Murphy, Emilie Parker, Jack Pinto, Noah Pozner, Caroline Previdi, Jessica Rekos, Avielle Richman, Lauren Rousseau, Mary Sherlach, Victoria Soto, Benjamin Wheeler, Allison N. Wyatt
SlowButSteady is offline  
Quote Quick Reply Share with Facebook
post #34 of 47 Old 05-05-2014
Junior Member
 
Join Date: May 2014
Location: Grenada
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: Ink black exhaust water - soot?

Hi, I'm new here and also have black soot coming out of the one engine exhaust with bubbles on the water when running under load 1500 on the mooring and not in neautral. So, it is felt that this is the pitch of the prop? Could well be as I have a re-built prop on that sail drive. The engine has been standing for a quite (4 months) a VP MD2030D with a warranty repair breakdown on the new sail drive, so I will take her out for a run and see if it clears, otherwise look at the prop. My other engine runs clean exhaust and they both share the same fuel tank, which makes me think it is not the dreaded diesel bug! Thanks Denise

Last edited by deniswithane; 05-05-2014 at 01:04 PM.
deniswithane is offline  
Quote Quick Reply Share with Facebook
post #35 of 47 Old 05-05-2014
Senior Member
 
gamayun's Avatar
 
Join Date: Aug 2009
Location: San Francisco
Posts: 561
Thanks: 17
Thanked 28 Times in 28 Posts
Rep Power: 7
 
Re: Ink black exhaust water - soot?

It's easy enough to check your exhaust elbow first and see if it's plugged. I started having those symptoms of soot on the water with the engine also bogging down. The elbow was almost completely plugged. They're good for 5-8 years. The manual says that running the engine at higher RPM under load helps to burn off this soot so it doesn't build up as much.
christian.hess likes this.
gamayun is offline  
Quote Quick Reply Share with Facebook
post #36 of 47 Old 05-05-2014
merit 25 solo "er"
 
christian.hess's Avatar
 
Join Date: Sep 2013
Location: Columbus, Ga
Posts: 4,579
Thanks: 189
Thanked 189 Times in 184 Posts
Rep Power: 2
 
Re: Ink black exhaust water - soot?

load it up and clean the exhaust system(elbow), manifold...

always have some sort of stabilizer in the diesel if not used frequently

almost all the time this is caused by clogged exhaust systems...

you will also notice a nice drop in running temps too...as an added bonus

Islander 36 no longer for sale...its MINE!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Planning maiden cruise for November-December 2015 to Panama Canal! The planning begins!!!
christian.hess is offline  
Quote Quick Reply Share with Facebook
post #37 of 47 Old 05-05-2014
Junior Member
 
Join Date: May 2014
Location: Grenada
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: Ink black exhaust water - soot?

Thanks, elbows are new so will be OK. Going to clean exhuast pipes and mannifold. Checked tanks and Raycors, all smells OK - always use additive for dreaded diesel bug in hot climate. Thinking it could be prop pitch related so will swop prop in water Wed and see if that works as I am sure somebody put on a diff prop at some time!

Last edited by deniswithane; 05-05-2014 at 02:52 PM.
deniswithane is offline  
Quote Quick Reply Share with Facebook
post #38 of 47 Old 05-05-2014
Junior Member
 
Join Date: May 2014
Location: Grenada
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: Ink black exhaust water - soot?

Elbows new, will check pipes - only 725 hours on this engine and running very cool in hot water of the Carib.
deniswithane is offline  
Quote Quick Reply Share with Facebook
post #39 of 47 Old 05-08-2014
Junior Member
 
Join Date: May 2014
Location: Grenada
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: Ink black exhaust water - soot?

I am so happy

As I have sorted out my problem on the one engine that the mech said was burnt out oil rings, etc. !!!!

I took off the prop on this port engine (which was a spare as such but was supposed to be identical to both the originals!) and put the old original re-painted one back on and HEY PRESTO, NO MORE BLACK SOOT under load!

So it was the prop pitch after all.

Thank you so much to everyone who pointed me in the correct direction - I have just joined this forum and what amazing feedback I got from all of you, without your input I would never have realised that and would have wasted good money on a mech who did not know much more than me !

Thanks again
Denise
deniswithane is offline  
Quote Quick Reply Share with Facebook
post #40 of 47 Old 05-08-2014
merit 25 solo "er"
 
christian.hess's Avatar
 
Join Date: Sep 2013
Location: Columbus, Ga
Posts: 4,579
Thanks: 189
Thanked 189 Times in 184 Posts
Rep Power: 2
 
Re: Ink black exhaust water - soot?

darn must of been quite the difference in pitch...

congrats!

Islander 36 no longer for sale...its MINE!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Planning maiden cruise for November-December 2015 to Panama Canal! The planning begins!!!
christian.hess is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
How to deal with exhaust soot on transom? EO32 Gear & Maintenance 23 06-05-2011 12:30 AM
Black oily exhaust Unmicky Diesel 8 06-03-2011 01:39 PM
Pitch Black Exhaust Water Yanmar 2GM20F rireefguy Gear & Maintenance 14 03-03-2010 08:13 AM
Yanmar - black smoke in exhaust JSL3 Diesel 18 07-20-2009 11:23 AM
Black Exhaust Stains On Transom eyebbober Gear & Maintenance 15 10-12-2004 11:15 AM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome