Black Exhaust Stains On Transom - Page 2 - 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
 Not a Member? 
  #11  
Old 10-05-2004
Senior Member
 
Join Date: Jan 2002
Location: Western Canada
Posts: 139
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 13
maxcontax is on a distinguished road
Black Exhaust Stains On Transom

I took a diesel maintenance course a few years back. the instructor was not impressed with how sailors treat diesel engines--he wanted us to run them nearly wide open and under load and long enough for them to get hot. We run them at low rpm, which means the Advance of about 17 degrees is wrong and the burn is inefficient. We run them cold, just enough to get out of the harbour. I think carbon buildup is the cause of the black and the solution may be 6 hours of running the engine at near maximum rpm. the problem with that, as we explained to the instructor, was loading up the prop and drivetrain because you are then trying to push the boat faster than hullspeed, which is not good for the rest of the system. Mine gets an "Italian Tuneup" twice a year, it is a 1984 raw water cooled Volvo and it runs fine.
Reply With Quote Quick reply to this message Share with Facebook
  #12  
Old 10-05-2004
Junior Member
 
Join Date: Sep 2004
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
eyebbober is on a distinguished road
Black Exhaust Stains On Transom

Thank you everyone! Im thinking its normal. Water is shooting out the back and its not overheating.

I need to know though what an Italian Tuneup is.

Thanks!
Reply With Quote Quick reply to this message Share with Facebook
  #13  
Old 10-06-2004
Senior Member
 
Join Date: Jan 2002
Location: Western Canada
Posts: 139
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 13
maxcontax is on a distinguished road
Black Exhaust Stains On Transom

Italian tuneup: warm up the engine and then run it close to wide open for 10 minutes. It blows out the carbon. Optimum rpm for the fixed advance on a diesel is nearly wide open for most. Auto/truck diesels have variable advances so they are fuel efficient at any speed, but marine diesels are fixed advance. They seem to set the advance for when you would be most in need of power, ie using full throttle. at 2150 rpm, where mine lives most of its life, it is not optimum. Nothing to be done about it, just the way they set them up. This is why they carbon up--this and too much time running cold.
Reply With Quote Quick reply to this message Share with Facebook
  #14  
Old 10-11-2004
ct ct is offline
Member
 
Join Date: Jun 2003
Posts: 41
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
ct is on a distinguished road
Black Exhaust Stains On Transom

White smoke is caused by engine oil burning. Check valve guides and seals . However you aren''t complaining of white smoke.

The most common cause of black smoke from a diesel engine is injector timing being too far advanced or dirty injectors.

When you first give some throttle, you might and should get a slight puff of black smoke which clears.
Reply With Quote Quick reply to this message Share with Facebook
  #15  
Old 10-11-2004
Senior Member
 
Join Date: Dec 2000
Posts: 654
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 15
hamiam is on a distinguished road
Black Exhaust Stains On Transom

hunh? i thought blue smoke was evidence of engine oil burning?
Reply With Quote Quick reply to this message Share with Facebook
  #16  
Old 10-12-2004
ct ct is offline
Member
 
Join Date: Jun 2003
Posts: 41
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
ct is on a distinguished road
Black Exhaust Stains On Transom

Engine oil smoke has been described as "blue", however most people complain of a "white-ish" or "white" smoke.

I agree that this can be confused with steam coming from the exhaust which might indicat a head-gasket problem.
Reply With Quote Quick reply to this message 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:

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

 
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
slight oil slick in diesel engine exhaust mcagney Gear & Maintenance 7 04-04-2013 02:15 AM
RIBs with Fold Down Transom timl Gear & Maintenance 7 09-17-2008 10:22 AM
Hot/dry exhaust installation owenmccall Gear & Maintenance 7 02-01-2005 03:21 PM
Atomic 4 exhaust dlahlers Gear & Maintenance 1 10-18-2001 02:18 PM
Cat30 Exhaust riser blew up - Engine won''t start E_N_Z_O Gear & Maintenance 2 07-31-2001 07:55 PM


All times are GMT -4. The time now is 02:49 PM.

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.