White Smoke - 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.


Reply
 
LinkBack Thread Tools
  #1  
Old 06-03-2011
Gulfislander's Avatar
Member
 
Join Date: Aug 2006
Posts: 70
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
Gulfislander is on a distinguished road
White Smoke

I need some advice. I have a Niagra 31 with a GM20FC Yanmar engine and SD20 saildrive. There is only 350 hours on both. I recently replaced the 2 blade folding Volvo prop with a 3 blade Flex-o-fold. On the first trip I noticed that there is a continuous but small amount of white smoke at cruising rpm's. I spoke with the mechanic at our marina who told me that most boats smoke. This answer did not inspire much confidence so I am reaching out to the boating community for help. Should I be worried?? The book I have on diesel engines speaks about lack of compression, air in fuel lines and unburnt fuel. I cannot see it as an engine problem as it still runs as smoothly as before switching props. I am thinking it has to do with the pitch of the blade...which I have to confess that my understanding of is a bit weak. I had given the manufacturer all the specifications and they had assured me that they supplied other owners of Niagra 31's (same engine and saildrive) with the same prop. Should I be worried? Is their something wrong? Other than this I love this prop...help! Thanks ahead of time.
Reply With Quote Share with Facebook
  #2  
Old 06-04-2011
Gladrags1's Avatar
Sailor
 
Join Date: Apr 2003
Location: Rock Creek, Maryland
Posts: 575
Thanks: 10
Thanked 12 Times in 12 Posts
Rep Power: 12
Gladrags1 is on a distinguished road
I can't say about what is causing it but white smoke usually is steam from an overheating engine. Black smoke is unburned fuel and gray is poor compression. How's the engine temp? Have you noticed this smoke prior to prop change? When the yard says "most diesels smoke," that is true. However mostly the color of that smoke would be gray not white.

Hope this helps.

Tod
__________________
Mandolin
Bayfield 36
Sailing out of Rock Creek, Chesapeake Bay
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #3  
Old 06-04-2011
JimsCAL's Avatar
Senior Member
 
Join Date: May 2007
Location: Glen Cove, NY
Posts: 2,430
Thanks: 2
Thanked 35 Times in 34 Posts
Rep Power: 8
JimsCAL is on a distinguished road
White smoke can just be water vapor in the exhaust gases condensing. Are you in a location where the water is cold? Does it clear up or reduce as the engine comes up to full operating temperature?

Last edited by JimsCAL; 06-04-2011 at 05:36 PM. Reason: Fixed typo.
Reply With Quote Share with Facebook
  #4  
Old 06-04-2011
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 14,699
Thanks: 68
Thanked 197 Times in 189 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
Has there been a noticeable change in boat speed/rpm with the new prop? If so it may be a pitch change issue.

If the 'white smoke' is no longer visible in your wake a few boatlengths aft (on a calm day) then it's likely water vapour. If there's a visible 'haze' behind you then it would truly be smoke. Another think that smokes white is burning antifreeze....

A plugging mixing elbow is another common possibility.
__________________
Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Reply With Quote Share with Facebook
  #5  
Old 06-04-2011
Gulfislander's Avatar
Member
 
Join Date: Aug 2006
Posts: 70
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
Gulfislander is on a distinguished road
Thanks for the responses. This engine does not have a temp gauge. It only has a temp alarm. I do have more speed with lower rpm's. I use to get 5 knts with 2800 rpm while now I get 6+ with 2500 rpm's.

The white smoke dissipates just a couple of feet from the aft of the boat and we do have quite cold water here in Vancouver. It does not seem to change when the engine come up to temp. It is consistent when under way.
Reply With Quote Share with Facebook
  #6  
Old 06-04-2011
SlowButSteady's Avatar
Senior Slacker
 
Join Date: Feb 2010
Location: SoCal
Posts: 4,223
Thanks: 0
Thanked 17 Times in 15 Posts
Rep Power: 5
SlowButSteady is on a distinguished road
Sounds like vapor from combustion products. Remember, burning any hydrocarbon produces lots of water vapor. Since the engine is FW cooled the only other way for water to get into the cylinders while running is from the FW cooling loop via a bad head gasket. If the coolant level isn't going down, and you don't appear to have a lot of gas bubbling out of the coolant overflow tank, the engine is probably fine.
__________________
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
Reply With Quote Share with Facebook
  #7  
Old 06-04-2011
T37Chef's Avatar
Senior Member
 
Join Date: Oct 2006
Posts: 4,169
Thanks: 65
Thanked 28 Times in 26 Posts
Rep Power: 8
T37Chef will become famous soon enough
You may try moving the injector pump timing forward a degree or two. Its easy to do, mark where it is now, loosen, move forward in the direction the arrow shows, tighten, check. Worked for me, got the tip from Buddy at Baltimore Diesel, he's been working on diesels for 50+ Yrs...he knows a thing or two
Reply With Quote Share with Facebook
  #8  
Old 06-05-2011
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 14,699
Thanks: 68
Thanked 197 Times in 189 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
Sounds like water vapour... the speed change indicates a coarser pitch than before so the engine is working a little harder..
__________________
Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
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
White smoke edwmama Diesel 3 05-02-2011 01:16 PM
Rebuilt Albin 2D, white smoke okawbow Diesel 10 02-17-2011 04:08 PM
Yanmar diesel white smoke hooligan6a Diesel 3 10-24-2010 08:29 AM
white smoke in exhaust SeaSteward Gear & Maintenance 13 04-17-2008 10:26 AM
White Smoke Alden68 Gear & Maintenance 31 03-27-2007 10:49 AM


All times are GMT -4. The time now is 10:47 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.