• Announcements

    • UnderDawg

      A Few Simple Rules   05/22/2017

      Sailing Anarchy is a very lightly moderated site. This is by design, to afford a more free atmosphere for discussion. There are plenty of sailing forums you can go to where swearing isn't allowed, confrontation is squelched and, and you can have a moderator finger-wag at you for your attitude. SA tries to avoid that and allow for more adult behavior without moderators editing your posts and whacking knuckles with rulers. We don't have a long list of published "thou shalt nots" either, and this is by design. Too many absolute rules paints us into too many corners. So check the Terms of Service - there IS language there about certain types of behavior that is not permitted. We interpret that lightly and permit a lot of latitude, but we DO reserve the right to take action when something is too extreme to tolerate (too racist, graphic, violent, misogynistic, etc.). Yes, that is subjective, but it allows us discretion. Avoiding a laundry list of rules allows for freedom; don't abuse it. However there ARE a few basic rules that will earn you a suspension, and apparently a brief refresher is in order. 1) Allegations of pedophilia - there is no tolerance for this. So if you make allegations, jokes, innuendo or suggestions about child molestation, child pornography, abuse or inappropriate behavior with minors etc. about someone on this board you will get a time out. This is pretty much automatic; this behavior can have real world effect and is not acceptable. Obviously the subject is not banned when discussion of it is apropos, e.g. talking about an item in the news for instance. But allegations or references directed at or about another poster is verboten. 2) Outing people - providing real world identifiable information about users on the forums who prefer to remain anonymous. Yes, some of us post with our real names - not a problem to use them. However many do NOT, and if you find out someone's name keep it to yourself, first or last. This also goes for other identifying information too - employer information etc. You don't need too many pieces of data to figure out who someone really is these days. Depending on severity you might get anything from a scolding to a suspension - so don't do it. I know it can be confusing sometimes for newcomers, as SA has been around almost twenty years and there are some people that throw their real names around and their current Display Name may not match the name they have out in the public. But if in doubt, you don't want to accidentally out some one so use caution, even if it's a personal friend of yours in real life. 3) Posting While Suspended - If you've earned a timeout (these are fairly rare and hard to get), please observe the suspension. If you create a new account (a "Sock Puppet") and return to the forums to post with it before your suspension is up you WILL get more time added to your original suspension and lose your Socks. This behavior may result a permanent ban, since it shows you have zero respect for the few rules we have and the moderating team that is tasked with supporting them. Check the Terms of Service you agreed to; they apply to the individual agreeing, not the account you created, so don't try to Sea Lawyer us if you get caught. Just don't do it. Those are the three that will almost certainly get you into some trouble. IF YOU SEE SOMEONE DO ONE OF THESE THINGS, please do the following: Refrain from quoting the offending text, it makes the thread cleanup a pain in the rear Press the Report button; it is by far the best way to notify Admins as we will get e-mails. Calling out for Admins in the middle of threads, sending us PM's, etc. - there is no guarantee we will get those in a timely fashion. There are multiple Moderators in multiple time zones around the world, and anyone one of us can handle the Report and all of us will be notified about it. But if you PM one Mod directly and he's off line, the problem will get dealt with much more slowly. Other behaviors that you might want to think twice before doing include: Intentionally disrupting threads and discussions repeatedly. Off topic/content free trolling in threads to disrupt dialog Stalking users around the forums with the intent to disrupt content and discussion Repeated posting of overly graphic or scatological porn content. There are plenty web sites for you to get your freak on, don't do it here. And a brief note to Newbies... No, we will not ban people or censor them for dropping F-bombs on you, using foul language, etc. so please don't report it when one of our members gives you a greeting you may find shocking. We do our best not to censor content here and playing swearword police is not in our job descriptions. Sailing Anarchy is more like a bar than a classroom, so handle it like you would meeting someone a little coarse - don't look for the teacher. Thanks.
ianmkent

Yanmar 1GM

15 posts in this topic

My Yanmar 1gm was running fine I increased the revs and noticed black colour water and black smoke coming out of the telltail I cut the engine out. And restarted at low revs still had the black stuff I then conected a fresh water tank for cooling but still had the same problem.

I recently brought the boat and the last owner did not use her much and when they did it was only for a few hours at a time. The engine was running fine from Faversham to Rye. Does anyone have any suggestions on fixing the problem.

Share this post


Link to post
Share on other sites

black smoke is too much fuel and not enough oxygen. if your temp alarm isn't going off, I wouldn't worry about that. check the air filter, even try running the engine with the air filter off (briefly) to see if it makes any change in the black smoke. if it isn't that, you could have an injector problem.

As an FYI, you should run it up every once in a  while to burn out the carbon. When I do this I get black particulate out of the exhaust for quite a while afterwards, but the black smoke is most likely related to the fuel/air mixture being heavy on the fuel side.

Share this post


Link to post
Share on other sites

New injectors solved a lot of problems on my 3gm and were cheap and easy to diy install. I just bought new nozzles for about $60 each, plus the required gasket set.  I also cleaned the pre combustion chamber while I was in there. 

Share this post


Link to post
Share on other sites

May have a bad thermostat.

Share this post


Link to post
Share on other sites

Check the exhaust elbow.  It may be plugged with carbon/scale causing back pressure and incomplete combustion.  I had the same symptoms and a new exhaust elbow fixed it on my 2GM and this year on my 3YM30.

Share this post


Link to post
Share on other sites

Dirty or over pitched prop? Did it gradually do that or all of a sudden? Will the engine pull maximum RPM's under load? Any work recently done on the engine?

Share this post


Link to post
Share on other sites
7 hours ago, Dabnis2 said:

Dirty or over pitched prop? Did it gradually do that or all of a sudden? Will the engine pull maximum RPM's under load? Any work recently done on the engine?

Thanks for all the replies, it did it all of a sudden.

Share this post


Link to post
Share on other sites

We need to take a poll!  All good suggestions on possible causes, but we need to see who is closest.

Share this post


Link to post
Share on other sites
6 hours ago, ianmkent said:

Thanks for all the replies, it did it all of a sudden.

Restriction in the air box, stray rag or? Line in the prop? Raw water restriction? Dry stuffing box? Bad batch of fuel ? (A stretch)

Share this post


Link to post
Share on other sites

I found out from the owner that the fuel had been in the tank for over a year and had not been serviced in there ownership. I really should have serviced her before leaving Faversham for the Solent.

Share this post


Link to post
Share on other sites
24 minutes ago, ianmkent said:

I found out from the owner that the fuel had been in the tank for over a year and had not been serviced in there ownership. I really should have serviced her before leaving Faversham for the Solent.

Maybe try fresh fuel from a small separate tank?

Share this post


Link to post
Share on other sites

The exhaust elbow on these don't last that long and the head will have a bunch carbon deposits restricting flow as well. There used to be someone on ebay selling them for $100. To clean the carbon deposits out of the head, it's probably best to pull the head (not hard to do). When cleaning, be careful not to chisel into the water jacket. If you damage the head a new one will be about $400. With head off, you can inspect the cylinder walls and valves which are probably fine. Not related to your issue, but keep an eye on the water pump leaking salt water onto the aluminum oil case cover and corroding it. If it's leaking, pull the pump and replace the seals and possibly the shaft. 

 

 

Share this post


Link to post
Share on other sites
11 hours ago, DSE said:

The exhaust elbow on these don't last that long and the head will have a bunch carbon deposits restricting flow as well. There used to be someone on ebay selling them for $100. To clean the carbon deposits out of the head, it's probably best to pull the head (not hard to do). When cleaning, be careful not to chisel into the water jacket. If you damage the head a new one will be about $400. With head off, you can inspect the cylinder walls and valves which are probably fine. Not related to your issue, but keep an eye on the water pump leaking salt water onto the aluminum oil case cover and corroding it. If it's leaking, pull the pump and replace the seals and possibly the shaft. 

 

 

having just been through this, you're right - pulling the head isn't hard at all. However the clearances on the rockers and percussion caps is a royal pita to get right since the adjuster threads are so coarse. Also, don't reassemble if you don't have a torque wrench.

You can get a replacement stainless 1gm10 elbow for $120, which is less than the OEM part. 

Share this post


Link to post
Share on other sites

I replaced my 1gm's elbow last month with the stainless one found here, nice guy and ships fast (got it in 2 days): http://exhaustelbow.com

I had the same issue with black water coming out of the exhaust, replacing the elbow fixed it. The inner tube within the elbow corrodes which can send the raw water in through the exhaust port depending on how bad it is. 

Share this post


Link to post
Share on other sites

I did my 3GM30F's elbow 2 years ago.  It wouldn't rev, black smoke, etc.  I bought the stainless version mentioned above.Fixed everything.

Just bcz, I cut it open in our machine shop.  This is what it looked like and it all made sense.

Elbow.jpg

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now