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  Topic Review (Newest First)
03-24-2012 08:20 AM
Re: diesel stop solenoid

I have seen solenoids that go both ways. The old detroit 2 strokes were normally open and energize shut in marine applications. The advantage of this is that a solenoid failure is not going to shut down the engine. I have never seen a normally open one in an OTR diesel, I wonder whether it isn't a regulation thing.

Also, some will have 1 set of coils and others will have 2. When there are 2, one set is used to activate the solenoid and the other set will hold it in the activated position while drawing much less power. For example, the dodge trucks with the Cummins from 94-98 were all this way.
03-23-2012 12:32 PM
Capt Len
Re: diesel stop solenoid

All the fuel solenoids I've been intimate with only need power to open and stay open. Lose the power ,shuts off, minimal draw anyway.
03-23-2012 09:44 AM
Re: diesel stop solenoid

Originally Posted by dabnis View Post
If you want to keep the electric solenoid you might want to check VW diesel parts. I had one fail and, IIRC, it was a separate unit that was easily replaced.

Paul T
This might be especially true if Volvo uses a Bosch injection pump - the solenoids may be the same and any VW diesel would have one. Our VW setup looks quite different from the one pictured in my previous post, but that may not match the OP's engine either...
03-23-2012 03:45 AM
Re: diesel stop solenoid

The usual price-gouging from the ever-inventive Volvo. Same old story. Yea, an engine sold at a competitive price (otherwise it won't sell at all) but later they are waiting for you with these awful prices for spare parts.

Check that you are feeding 12V to the solenoid. Check with your multimeter. You should hear a "click" when you are feeding that to the solenoid. All it is is an electromagnet that when energised pushes (or pulls) against a spring and shuts off the fuel.

If it has failed, put a manual stop on it and tell Volvo to stuff their $435 electrical fuel shut-off solenoid up their collective rear.

What an utterly marvellous idea. Yea, a fuel shut off that needs electrical power, on a sailboat, in a seawater environment.

You have to have one for the starter motor, but no-where else.
03-22-2012 12:55 AM
Capt Len
Re: diesel stop solenoid

If you go for a manual pull shut off check my comments in "how to destroy an engine" I don't consider myself a complete idiot but sometimes I wonder. I take solace in knowing those that can't, teach.
03-20-2012 02:36 PM
Re: diesel stop solenoid

If you want to keep the electric solenoid you might want to check VW diesel parts. I had one fail and, IIRC, it was a separate unit that was easily replaced.

Paul T
03-20-2012 01:57 PM
Re: diesel stop solenoid

Yup that is true on the older Mech fuel systems. The introduction of electronic controlled injectors rendered that all but gone these days.

I removed my fuel solenoid long ago. I just did not want the power drain while sailing.
In run mode the solenoid is energized all the time and pulls a lot of power. Id rather use that power for more important things like ....the radio of such. lol
03-20-2012 12:07 AM
Re: diesel stop solenoid

I second Klem's suggestion. I would probably install a manual pull cable as well. If the solenoid holds the fuel open when energized, as John indicated, I would pull off the solenoid and put a spring in there to hold the fuel lever "on" and install a shut off cable to overcome the spring pressure to shut it off.

Agree also with John that diesels should run without power if need be. Cummins motors in highway trucks had a solenoid energized to keep the motor running, but there was a manual override screw in case the solenoid went kaput.
03-19-2012 11:52 PM
Re: diesel stop solenoid

Oh man, I didn't need to hear this. I have an MD31A too, now I have to worry about mine going out and facing the BCTV (big check to Volvo). Unfortunately I would have to guess that there isn't a cheap alternative to the factory solenoid. I'll have to check mine but it seems like the solenoid is energized to run so you may be able to hook up some kind of manual cable like was suggested above to operate the engine (I'm a strong believer that all marine diesels should be able to run with no electric power) . I'll try to check it out tomorrow. Maybe someone else has done the manual conversion and will pipe in here.
03-19-2012 09:04 PM
Re: diesel stop solenoid

Faster's advice is a good place to start.

The only thing that I would add is that if the cost really bugs you and it is not repairable, you could put in a manual pull cable. I have done this on two different engines and it only takes a $20 pto cable and a homemade bracket and you have a manual shutdown. The hardest part is isolating it properly so that it isn't really noisy. This option is definitely not for everyone and I am not familiar with your specific engine so it might not fit anyways.
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