Volvo Penta MD7A started but shut off - SailNet Community
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post #1 of 9 Old 03-26-2013 Thread Starter
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Volvo Penta MD7A started but shut off

Know this is probably a rookie mistake but here goes... I started up the engine today for the first time of the spring. Started up great and ran great for a couple of minutes then all of a sudden just shut off. ... what am i missing??

there was plenty of fuel in the tank... I had drained the fuel filter in the fall... does this mean i need to bleed the fuel system?
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post #2 of 9 Old 03-26-2013
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Volvo Penta MD7A started but shut off

I have an MD5B. I would have to guess it is air. I could not get mine to start for anything after I bought it, and finally resorted to a little squirt of starter fluid in the air intake. I was told never to do this by the fine folks on this forum and others, but after using the same method for years growing up with a John Deer farm tractor, I thought I would give it a try. Been running ever since. Your mileage may vary.

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post #3 of 9 Old 03-27-2013
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Re: Volvo Penta MD7A started but shut off

Follow the instructions in your manual for bleeding the fuel system and then you will find that your engine works again. All the air that you introduced into the fuel system is now in the injection pump and injectors which is why the engine stopped.
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post #4 of 9 Old 03-27-2013 Thread Starter
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Re: Volvo Penta MD7A started but shut off

Much thanks for the replies, appreciate the help. I'll be bleeding today right after work.
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post #5 of 9 Old 03-27-2013
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Re: Volvo Penta MD7A started but shut off

If you need to crank the engine for more than a few seconds to start it, be sure to shut off your raw water intake until the engine is actually running. While cranking you can flood the exhaust system to the point that when you stop water can run back into an open exhaust valve.. never good news.
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post #6 of 9 Old 03-27-2013
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Re: Volvo Penta MD7A started but shut off

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Originally Posted by itsaboat View Post
I have an MD5B. I would have to guess it is air. I could not get mine to start for anything after I bought it, and finally resorted to a little squirt of starter fluid in the air intake. I was told never to do this by the fine folks on this forum and others, but after using the same method for years growing up with a John Deer farm tractor, I thought I would give it a try. Been running ever since. Your mileage may vary.
It is my understanding that it is OK for direct injection engines but very bad for pre-combustion chamber engines. I had a 3-71 Detroit diesel and used it all the time, just a brief whiff. Out of desperation on a minus 15 degree, Fahrenheit, day and a dying battery I used just a slight bit near the intake of a VW diesel and got away with it. However, I have seen pictures of the head of a pre-chamber engine that suffered big time, new head, damage from using ether. I have read WD-40 works and may not be as volatile.

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post #7 of 9 Old 03-27-2013
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Re: Volvo Penta MD7A started but shut off

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there was plenty of fuel in the tank... I had drained the fuel filter in the fall... does this mean i need to bleed the fuel system?
You probably could have just bled it at the fuel filter before starting and all would have been fine. But that slug of air made its way all the way to the injectors so you'll have to bleed the whole system.

no problem though, we've all done it at least once! it's like running aground ... sort of a rite of passage :-)

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post #8 of 9 Old 03-27-2013
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Re: Volvo Penta MD7A started but shut off

Maybe check your tank vent?

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post #9 of 9 Old 03-27-2013
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Volvo Penta MD7A started but shut off

Yeah, I should have said use any amount of starter fluid VERY sparingly. It was a last resort for me after bleeding and WD-40 failed. The head bolts of a John Deer farm tractor are probably better suited to the cylinder explosion that will ensue.

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