Too much smoke on startup - 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 > General Interest > General Discussion (sailing related)
 Not a Member? 


Reply
 
LinkBack Thread Tools
  #1  
Old 09-13-2010
Member
 
Join Date: Feb 2010
Location: georgian bay, ontario
Posts: 56
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
TheMadchef is on a distinguished road
Too much smoke on startup

Hi all,
Been a while since my last post.
Question:
When I start my engine (inboard sterdrive Volvo 18hp diesel) there appears to be too much smoke emminating from the exhaust. It starts easily but a plume of dark smoke exhausts upon ignition. With the throttle at half to full at starting the RPMs lag for about 4 seconds then catch up to the throttle setting and I ease it back to 1800 RPM for warm up. The oil and filters have been changed fairly recently. What could be the problem? I hate to ask questions like these but am a newbie to diesels and won't be taking my diesel engine course until the winter.
The engine runs well overall but does seem to have a fairly high vibration until it really warms up.
Any advice is greately appreciated!
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 09-13-2010
F4d3d's Avatar
Senior Member
 
Join Date: Jun 2010
Location: Banff, Alberta, Canada
Posts: 103
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
F4d3d is on a distinguished road
I spent some time on a boat with a Volvo Penta MD2, and there was a fair bit of smoke at the start-up as well. I talked with a mechanic about it and he said it was pretty normal behaviour. But I guess this is subjective since I can't see exactly how much smoke you have compared to what I had...
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 09-13-2010
Classic30's Avatar
Once known as Hartley18
 
Join Date: Aug 2007
Location: Melbourne, Australia
Posts: 4,618
Thanks: 38
Thanked 54 Times in 54 Posts
Rep Power: 9
Classic30 will become famous soon enough Classic30 will become famous soon enough
Sounds like a fuel issue to me.. but then I'm only discovering these things myself and, at the moment, fuel seems to me to be responsible for nigh everything the matter with diesels.

Which engine do you have exactly? At 18hp, I'm guessing it isn't a single-cylinder one.
__________________
-
"Honestly, I don't know why seamen persist in getting wrecked in some of the outlandish places they do, when they can do it in a nice place like Fiji." -- John Caldwell, "Desperate Voyage"
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 09-13-2010
ffiill's Avatar
Senior Member
 
Join Date: Jul 2010
Posts: 235
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
ffiill is on a distinguished road
Dont know this engine personally but when there is a lag on start up might suspect a sticking injector which clears as it gets warm-my four cylinder Mercedes does this sometimes on one and occasionally two injectors.Injector(s) may need testing and cleaning?
Google this as there are various sites telling you about diesel smoke diagnosis-its colour-and smell!
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 09-13-2010
St Anna's Avatar
Senior Member
 
Join Date: Mar 2003
Location: Southern QLD, Bayside
Posts: 1,428
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 12
St Anna is on a distinguished road
As FFiill says - I would look at the injectors - they might be starting to glass up. The colour and smell will speak volumes. Is it leaking any diesel through the exhaust when under load.

Have you run it under load? Or have you just let it tick over? Most naturally aspirated diesels need to be under load so - in gear and cruising revs at least when in a marina - (mooring lines will be fine)

I had a MD7A in a previous boat - ( Old volvos are nicknamed "the green death" - cant think why) It would send smoke signals.

Does it run normally otherwise -are the vibration only at certain revs/ in gear etc etc.

Go for a motor - really use the engine for a good days run!! Clean it out.

Let us know
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 09-14-2010
Ilenart's Avatar
Senior Member
 
Join Date: Jul 2007
Location: West Australia
Posts: 506
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 8
Ilenart is on a distinguished road
Throttle at half to full for startup and then running 1800RPM for warmup sounds like a lot of revs. I would'nt normally exceed 1,000RPM's for starting and warmup would normally be 600-800RPM. If you used less revs it might solve your excess smoke issue, plus result in a lot less wear on the engine.

Ilenart
Reply With Quote Quick reply to this message Share with Facebook
  #7  
Old 09-14-2010
ffiill's Avatar
Senior Member
 
Join Date: Jul 2010
Posts: 235
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
ffiill is on a distinguished road
To start any diesel other than modern computer controled ones procedure is preheat if you have heaters;full throttle giving max.fuel and air;start and immediately throttle back to about 1000 rpm for warm up.
Reply With Quote Quick reply to this message Share with Facebook
  #8  
Old 09-14-2010
BobS2's Avatar
Member
 
Join Date: Sep 2008
Location: Delaware
Posts: 39
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
BobS2 is on a distinguished road
My little yanmar 1GM10 was smokey & sooty on start up until I started leaving the fuel shut off cable in the shut-off position. Seems better now.
Reply With Quote Quick reply to this message Share with Facebook
  #9  
Old 09-20-2010
Junior Member
 
Join Date: Aug 2010
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
mylynne is on a distinguished road
This could almost be registered as an OMG. Everything everyone has said could be legitimate issues with your motor. Diesels are very finicky creatures. They must have clean fuel and clean oil. These two points can not be underscored enough. I change my oil every 75 hours and change the oil filters every 25. They are really cheap. Fuel filters I check the racor each start up and change the fuel filters every 75 hours. Overkill? Absolutely. But it's cheap overkill and not difficult to perform. You may indeed have an injector going bad. They are very simple to have flow checked at a shop. Your mixing elbow could also be clogged with soot as could the manifold. It could also need the valves re-set.

Best tip I can give on any start up is this. Upon start up, keep your RPMs to a minimal. High revs on a cold motor are only hurting the engine. If you are going to sit at the dock put the boat in gear. These little engines must be under a load. Some of the biggest mistakes made by sailboaters are not allowing the engine to reach full operating temeratures before shut down, not running the engine under a load, especially when charging batteries and dirty fuel, filters etc.

Finally, even if it smokes at start up, does it run fine with the smoke going away in a few minutes? If so, I'd have a flow test done on the injectors and check the mixing elbow and manifold for soot build up. If those damn pipes become clogged with rust and soot they have a pronounced effect on the motors operation.
Reply With Quote Quick reply to this message Share with Facebook
  #10  
Old 09-20-2010
MedSailor's Avatar
Closet Powerboater
 
Join Date: Mar 2008
Location: Anacortes PNW
Posts: 2,955
Thanks: 162
Thanked 74 Times in 65 Posts
Rep Power: 7
MedSailor is on a distinguished road
Quote:
Originally Posted by mylynne View Post
This could almost be registered as an OMG. Everything everyone has said could be legitimate issues with your motor. Diesels are very finicky creatures. They must have clean fuel and clean oil. These two points can not be underscored enough. I change my oil every 75 hours and change the oil filters every 25. They are really cheap. Fuel filters I check the racor each start up and change the fuel filters every 75 hours. Overkill? Absolutely. But it's cheap overkill and not difficult to perform. You may indeed have an injector going bad. They are very simple to have flow checked at a shop. Your mixing elbow could also be clogged with soot as could the manifold. It could also need the valves re-set.

Best tip I can give on any start up is this. Upon start up, keep your RPMs to a minimal. High revs on a cold motor are only hurting the engine. If you are going to sit at the dock put the boat in gear. These little engines must be under a load. Some of the biggest mistakes made by sailboaters are not allowing the engine to reach full operating temeratures before shut down, not running the engine under a load, especially when charging batteries and dirty fuel, filters etc.

Finally, even if it smokes at start up, does it run fine with the smoke going away in a few minutes? If so, I'd have a flow test done on the injectors and check the mixing elbow and manifold for soot build up. If those damn pipes become clogged with rust and soot they have a pronounced effect on the motors operation.

You change the oil every 75 and the filters every 25? How do you change the oil filters without spilling (changing) the oil?

MedSailor
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


I have a sauna on my boat, therefore I win.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
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
Wax job and exhaust smoke grinfax Gear & Maintenance 3 10-26-2008 09:19 PM
Exhaust smoke winethief Gear & Maintenance 2 07-28-2008 08:42 PM
Business grant for charter startup jimi71 Chartering 17 04-08-2007 08:38 PM
Fwd: Re: [BristolYachts] startup checklist NewsReader Mass Bay Sailors 0 06-30-2006 06:15 PM
Yanmar engine startup smoke WillS Gear & Maintenance 4 08-23-2001 05:42 AM


All times are GMT -4. The time now is 08:26 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.