Diesel Stalls at Idle - Page 2 - SailNet Community

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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 06-17-2010
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At least 9 times out of 10 this condition is caused by an air leak in the system before the lift pump. If the leak were after the lift pump it would likely be a dripping fuel leak, but not always.

Do you get clear fuel to the engine mounted fuel filter (with the bleed screw open) when manually operating the pump? If not, start at the tank and check each connection and filter for proper seating. You may have to remove the tank pickup if there are connections in the tank above the fuel level. You may have to disconnect and reconnect each fitting. I would use diesel rated thread compound on threaded fittings. You could temporarily put some clear heavy wall tubing inline before the lift pump to check for air bubbles in the system. Good luck.
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  #12  
Old 06-18-2010
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Thanks. I think I've already checked all that, but I'll got over it again. Wouldn't any air leak cause stalling or none starting regardless of rpm?
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Old 06-18-2010
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If starts readily after stalling, its not air lead in fuel lines.
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Old 06-19-2010
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For the OP and this one
Quote:
Originally Posted by capcass View Post
I have a 1980 Yanmar 2Gm installed on my 30ft sailboat. It runs fine at all rpms, except below 1100 when it stalls. I've changed the injectors, filters and bled the system withtout any remedy. The lift pump was replaced last year. Any suggestion as to what to check next (i.e injector pump timing, compression, valve adjustment, etc.) ? I am prepared to bring in a diesel mechanic, but would like to know that he is following the right diagnostic process rather that just changing parts. Any suggestion on what may be the most likely cause of this low idle stalling condition for this engine would be greatly appreciated.
Thanks,
Gary Cassidy, USCG Master
capcass@optonline.net
When the engine comes down to idle then anything causing load on the motor will stall it .
So if your Alternator is under load because its trying to charge your batteries that will cause it . If your water pump is building up pressure for some reason that might stall it. If the shaft into the gearbox is binding for any reason that will do it.Perhaps there is a problem moving the rocker gear or a valve bent . Whatever causes the load.

Have the idle set higher than recommended . Say set it at 1000 rpm to be sure . It does not use much more fuel at that speed than 750 rpm,and you will feel safer. Your motor is talking to you all the time . Its saying ¨I´m loaded up and having trouble here Boss¨

Last edited by tytower; 06-19-2010 at 04:57 PM.
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  #15  
Old 06-20-2010
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Still stalling at 1100 rpm even in neutral

Quote:
Originally Posted by tytower View Post
For the OP and this one


When the engine comes down to idle then anything causing load on the motor will stall it .
So if your Alternator is under load because its trying to charge your batteries that will cause it . If your water pump is building up pressure for some reason that might stall it. If the shaft into the gearbox is binding for any reason that will do it.Perhaps there is a problem moving the rocker gear or a valve bent . Whatever causes the load.

Have the idle set higher than recommended . Say set it at 1000 rpm to be sure . It does not use much more fuel at that speed than 750 rpm,and you will feel safer. Your motor is talking to you all the time . Its saying ¨I´m loaded up and having trouble here Boss¨
Thanks for the replies, but I am still baffled. I have the idle set at 1100 and it does not appear that the pumps are binding or that the alternator is working exceptionally hard to charge the batteries. The system has been thouroughly bled and I am getting clear fuel at the filter bleeders and injector pump, but I do not get any fuel from the bleeder bolts at the top of the injectors. My Yanmar dealer tells me this is normal, and the engine runs fine at higher rpm. There appears to be significant blow-by, as evidenced by smoke coming from the breather, when I remove the cap and from the air intake when I remove the air cleaner. Could a valve adjustment help reduce this? Is this a possible cause of low idle stalling? I'm also thinking that there may be some obstruction at the bottom of the pick-up tube in the tank, but I don't kow if this would cause a problem only at low idle?
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  #16  
Old 06-22-2010
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Try a valve clearance check rather than adjustment , perhaps one is being held open . They can tighten themselves up sometimes.
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