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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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  #11  
Old 05-23-2013
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Re: 2GM 15 dies when I put it in Fwd

As was told to me. "Diesels need air, clean fuel without air in it, and they will run forever" So. when was the last time your filters were changed?
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  #12  
Old 05-23-2013
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Since the motor runs fine in reverse, but stalls in forward...I'm suspecting something is going on in the transmission since that's the only thing that has changed...
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  #13  
Old 05-23-2013
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Re: 2GM 15 dies when I put it in Fwd

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Originally Posted by ltgoshen View Post
Itís been Getting harder and harder. When I first got the boat, Last February, we noticed that it was a pain in the &*^% but we learned to use it. Last month we blue the external oil line and had to change it out. After that, it has become so bad that it makes tight quarter maneuvering very risky.
Does the engine smoke when you put it in forward? How about when you add throttle to keep it running? How big is your alternator and are your batteries fully charged? I ask because I put an 80 amp alternator on my 2QM15 and if the batteries were low, it was hard to keep it running at low RPMs in forward. Reverse didn't seem as bad, probably a lower gear ratio in transmission.
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Old 05-23-2013
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Re: 2GM 15 dies when I put it in Fwd

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Originally Posted by FarCry View Post
Does the engine smoke when you put it in forward?
Yes id does smoke some now when I rev it up? Is this a sign it needs to be blead out?
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Old 05-23-2013
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Re: 2GM 15 dies when I put it in Fwd

Also, the rev gear has like half speed as Fwd and has almost no thrust. So i only have problems under a load.ie Forward. And yes it smokes when I throttle hard but then clears up
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A little smoke that appears when you throttle hard, but then disappears quickly is normal.
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Re: 2GM 15 dies when I put it in Fwd

So at this point I should check the linkage for full travel.and bleed the injectors?
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Old 05-23-2013
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Re: 2GM 15 dies when I put it in Fwd

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Originally Posted by ltgoshen View Post
So at this point I should check the linkage for full travel.and bleed the injectors?
I have heard this recommendation before but am puzzled.

If the boat is running doesn't that bleed the injectors.
IE what air can be left if the engine is running?

I understand the concept of bleeding the fuel line if the engine will not start. If enough fuel doesn't get to the injectors it will not start.

Wait I think I got it.

It is not that their is air trapped in the line, it is that there is a small leak that is continuous that is making the mixture a little too lean that only shows up at idle.
"Bleeding" is really effectively tightening and getting rid of that leak.

Is that it?

No with that kid of pressure the fuel would leak before air would get in.
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Last edited by davidpm; 05-23-2013 at 10:09 PM.
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Re: 2GM 15 dies when I put it in Fwd

Anything that causes loss of power should be considered.
One thing that can cause loss of power is some constriction in the exhaust.
A clogged mixing elbow is a very common issue.
Many exhaust systems are not designed that great to start with and any constriction will put it over the edge.
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Old 05-24-2013
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Re: 2GM 15 dies when I put it in Fwd

OK, you mentioned just now that you have a folding prop. That partly explains why you get revs in reverse, because some of those props are pretty useless going backwards and do not stay fully extended. At idle in reverse it is probable that the blades are hardly open at all. Therefore there is not as much load on the engine in reverse.

So, if the shaft turns freely and is not moving forward under load to put stress on the gearbox or some other part of the shaft log, it seems simply a case of the engine not making power. Often a diesel with some air in the fuel system will start and run, but never make full power. It could be as simple as that, or as others suggest could be low compression (you hope not), injection timing out of whack (easy fix, if you have the book on it), clogged air intake (even easier), clogged exhaust elbow (easy enough but dirty job).
Just work through it starting with the easy jobs first.

Last edited by arvicola-amphibius; 05-24-2013 at 12:57 AM.
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