Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 09-07-2008, 09:23   #1
Registered User

Join Date: Jul 2008
Posts: 5
ENGINE DIES WITH WHITE SMOKE PERIODICALLY

HI,
I HAVE 30 YEARS OLD SOLE DIESEL 12 HP SINGLE CYLINDER ENGINE. THE PROBLEM IS THAT THE ENGINE DROPS RPM AND STOPS APROX. AFTER 2 HOURS AT CRUISING SPEED. I CAN START IT IMMEDIATELY, BUT IT WILL RUN ONLY ON MINIMAL RPM, A LOT OF WHITE SMOKE IS COMING FROM THE EXAUST AND OILY SHEEN IS SEEN ON THE WATER, THIS STOP AFTER SEVERAL MINUTES AND AFTER 10 MIN. I CAN INCRESE RPM AGAIN. I HAVE MADE SEVERAL SUCH CIRCLES TO GET HOME. I HAVE CLEANED THE FUEL SUPPLY WITH ALL FILTERS. RECENTLY I GOT WATER IN THE GEARBOX FROM BROKEN SEAL ON THE WATERPUMP-CAN THIS BE THE CAUSE.
THANK YOU FOR ANY ADVICE.
__________________

__________________
flicka is offline   Reply With Quote
Old 09-07-2008, 10:35   #2
Registered User

Join Date: Mar 2007
Location: Lakeland, FL
Posts: 1,296
White smoke is generally a sign of water in the combustion chamber. There are several ways that this might happen, but itís hard to imagine how this would happen after 2 hours of operation and then go away 10 minutes later.
__________________

__________________
slomotion is offline   Reply With Quote
Old 09-07-2008, 10:45   #3
Senior Cruiser
 
mikereed100's Avatar

Cruisers Forum Supporter

Join Date: Dec 2005
Location: Santa Barbara
Boat: 46' custom cat
Posts: 1,573
Images: 2
I am not a mechanic, but a faulty head gasket would be at the top of my list of suspects. It is strange that the problem resolves after 10 min at low rpms. Evil demons cannot be ruled out in this case. If you lack the equipment to do a compression test a mechanic (or exorcist) may be in your future.

Mike
__________________
mikereed100 is offline   Reply With Quote
Old 09-07-2008, 10:53   #4
Registered User

Join Date: Jul 2008
Posts: 5
THANK YOU FOR ANSWERING, BUT MECHANICS HAVE DONE THEIR JOB
THEY HAVE AN IDEA, THEN THEY FIX SOMETHING THE ENGINE IS OFCOURSE WORKING BUT JUST FOR ANOTHER 2 HOURS. SINCE IT IS A STRANGE SYMPTOM AND I DO NOT WANT TO THROW AWAY MORE MONEY I HAVE DECIDED TO POST IT HERE. ANYHOW IT SEEMS I WOULD HAVE TO CHANGE THE ENGINE.
__________________
flicka is offline   Reply With Quote
Old 09-07-2008, 11:37   #5
Registered User

Join Date: Sep 2007
Posts: 298
The problems you describe sound like a head gasket except for the fact that it later runs OK. Can you look at the sediment bowl to see if any water is coming into the injectors? Blown head gaskets usually don't cause intermittent symptoms.
__________________
TexSail is offline   Reply With Quote
Old 09-07-2008, 11:47   #6
Senior Cruiser
 
Lancerbye's Avatar

Cruisers Forum Supporter

Join Date: Mar 2007
Location: Ladysmith,BC, Vancouver Island , Canada
Boat: Lancer 44 Motorsailer
Posts: 1,758
Images: 32
Say three Hail Marys. Hire a witch Doctor and an exorcist. Hang garlic in the engine room, drive a spike through it's black heart. If that fails take two aspirins and call a better mechanic. You are definately burning water. Don't know what your head gasket looks like. You might try retorquing your head bolts. I have seen this happen when an engine was cold and go away after it warmed up. I have also seen that symptom when water got into the crankcase. Have fun.
__________________
The basis of accomplishment is in never quitting
Mengzi Meng-tse
Lancerbye is offline   Reply With Quote
Old 09-07-2008, 11:56   #7
Registered User
 
uncle_fred's Avatar

Join Date: Aug 2006
Location: baleares
Boat: feeling kerie 10:40
Posts: 62
Images: 5
Send a message via AIM to uncle_fred Send a message via MSN to uncle_fred Send a message via Yahoo to uncle_fred Send a message via Skype™ to uncle_fred
Quote:
Originally Posted by slomotion View Post
White smoke is generally a sign of water in the combustion chamber. There are several ways that this might happen, but itís hard to imagine how this would happen after 2 hours of operation and then go away 10 minutes later.
sounds the same to me cylinder head gasket get it changed and your problems should be solved, if you keep it running and have bad luck new bearings, or a new engine cheaper to get it done early.

Fred
__________________
I'm not afraid of storms, for I'm learning to sail my ship.
http://www.freewebs.com/fredfreund/
uncle_fred is offline   Reply With Quote
Old 09-07-2008, 13:25   #8
Registered User

Join Date: Mar 2007
Location: Lakeland, FL
Posts: 1,296
Or: is there any indication that this engine is overheating? If so, you may have raw water vaporizing in the exhaust/heat exchanger. Again, there could be several possible causes, but again it's difficult to explain why this would be only a periodic condition.
__________________
slomotion is offline   Reply With Quote
Old 09-07-2008, 13:51   #9
cruiser

Join Date: Nov 2004
Posts: 4,525
I have problem similar to this on my port engine as well. It's on the list of things to look into this winter.

Mine emits white smoke for a couple hours, then slowly improves. Oddly, it's the same engine that loses RPMs (sometimes a couple hundred, other times 1000) while underway, but bounces back in seconds.

It also runs *ever* so slightly cooler than the starboard engine.

2005 Yanmar 30HP. Quality. NOT.
__________________
ssullivan is offline   Reply With Quote
Old 09-07-2008, 18:27   #10
Senior Cruiser
 
mikereed100's Avatar

Cruisers Forum Supporter

Join Date: Dec 2005
Location: Santa Barbara
Boat: 46' custom cat
Posts: 1,573
Images: 2
Quote:
Originally Posted by flicka View Post
THANK YOU FOR ANSWERING, BUT MECHANICS HAVE DONE THEIR JOB
THEY HAVE AN IDEA, THEN THEY FIX SOMETHING THE ENGINE IS OFCOURSE WORKING BUT JUST FOR ANOTHER 2 HOURS. SINCE IT IS A STRANGE SYMPTOM AND I DO NOT WANT TO THROW AWAY MORE MONEY I HAVE DECIDED TO POST IT HERE. ANYHOW IT SEEMS I WOULD HAVE TO CHANGE THE ENGINE.
I've had the same experience with mechanics and as a result now do all my own work. Don't give up on it just yet. It is a fairly simple (and cheap if you do it yourself) process to replace a head gasket. If you are not mechanicly inclined this is a good way jump in and bond with your motor. If it fixes the problem you will feel good about yourself until the next thing goes wrong. If it doesn't fix the problem you will have eliminated one possible cause and can move on from there. Unless you have a cracked block you should be able to work this out eventually. Good luck and keep us posted.

Mike
__________________
mikereed100 is offline   Reply With Quote
Old 09-07-2008, 19:33   #11
Registered User

Join Date: Jun 2008
Location: St. Louis, MO; Grenada
Boat: Lagoon 420
Posts: 144
A 30 year old engine probably has a lot of problems. Before undertaking any costly repairs, I would price out a new engine.
__________________
Bradley is offline   Reply With Quote
Old 09-07-2008, 20:19   #12
Registered User

Join Date: Jun 2005
Posts: 1,901
cracked head?
__________________
never monday is offline   Reply With Quote
Old 09-07-2008, 21:01   #13
Moderator
 
Boracay's Avatar

Cruisers Forum Supporter

Join Date: Feb 2004
Location: Pelican Bay, Great Sandy National Park
Boat: Steel Roberts Offshore 44
Posts: 5,175
Images: 18
4th law of thermodynamics...

Since I never quite worked out what the first three were it must be the 4th that is giving trouble.

Or more seriously it sounds like you have a heat/temperature related problem.

Heat is flowing into a heat sink and when the sink is full the temperature rises.
When it rises past the trigger point the white smoke/lose power event occurs.

My guess is the engine/gearbox is the heat sink and the part that is temperature sensitive is oil related.

Quick and dirty fix : Make sure the oil is topped up fully before starting the engine. Change the oil to one of the newer synthetic types which could reduce heat build up. Check that the raw water intake is clear. Ensure that cool fresh air is reaching the engine, and that hot air is leaving the engine (try without engine cover if this is can be done safely).

Slow clean fix : Totally clean the engine/gearbox. Examine it carefully in a good light for any signs of damage or oil leaks. Carefully tighten (finger tight) all connections with the correct size socket or even a torque wrench if available. If gaskets are available take off the rocker cover and tighten the head bolts in the correct sequence with a torque wrench.

The bad news : You engine is complaining about its age and hard life. Spending large amounts of money on repairs may not be economic. How expensive/difficult is it to replace the engine?
__________________
Rust never sleeps
Boracay Blog.
Boracay is offline   Reply With Quote
Old 09-07-2008, 21:02   #14
Moderator Emeritus
 
Ex-Calif's Avatar

Cruisers Forum Supporter

Join Date: May 2007
Location: Singapore
Boat: Maxi 77 - Relax Lah!
Posts: 11,514
Images: 4
White smoke indicates unburned fuel - The oily sheen in the water supports the diagnosis.

So you either have too much fuel or the temperature in the cylinder is being lowered causing incomplete combustion.

Temerature in the cylinder can be lowered if oil or water is getting into the combustion chamber.

If you have a fresh water cooling system and are not replacing fluid in the fresh water circuit then water loss might be ruled out depending how the raw water circuit is set up. You can also check to see if there is oil in the fresh water circuit. This could be another indicator of head gasket or (very unlikely) a cracked head.

However, a bad head gasket wouldn't fix itself after a brief shut down so I don't lean that way.

I don't know specifically how the injector is constructed but this could be an injector pump or fuel delivery problem.

Before I would embark on an expensive repower I would want to get to the bottom of things. A compression check, a removal and replacement of the nozzles and perhaps an injector pump replacement would be my first trail of troubleshooting.

As a single cylinder engine this shouldn't be too hard to track down.
__________________
Relax Lah! is For Sale <--- Click
Click--> Custom CF Google Search or CF Rules
You're gonna need a bigger boat... - Martin Brody
Ex-Calif is offline   Reply With Quote
Old 09-07-2008, 22:00   #15
Eternal Member
 
Chief Engineer's Avatar

Join Date: Aug 2006
Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
Posts: 3,798
Hunh????

Look for the simple things first.

You said you got water in the gearbox. Does the gearbox and engine share the same oil?

Have you checked your exhaust for blockage?

Do you have a temp gauge on the engine?

It could be any number of things

Remember the triangle of fire Air-Fuel-Heat


Quote:
Originally Posted by Ex-Calif View Post
White smoke indicates unburned fuel - The oily sheen in the water supports the diagnosis.


As a single cylinder engine this shouldn't be too hard to track down.
__________________

__________________
Chief Engineer is offline   Reply With Quote
Reply

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
Engine Dies... drh1965 Engines and Propulsion Systems 19 01-04-2008 12:27
Up in Smoke TaoJones Health, Safety & Related Gear 0 02-11-2007 15:29
white smoke or steam limmer Engines and Propulsion Systems 18 02-10-2007 22:56
White smoke and oily sheen on water from new rebuilt Yanmar 3JH2E Woody on "Hannah" Engines and Propulsion Systems 25 16-04-2007 20:07
WHITISH SMOKE keller Electrical: Batteries, Generators & Solar 15 10-02-2006 18:36



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 16:43.


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.