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Old 06-01-2012, 16:30   #16
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Location: Falmouth UK
Boat: Hallberg Rassy 352 - 35ft
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Re: Mastervolt WhisperGen 3500 Problem

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Originally Posted by moose View Post
Dear Mrhigherbeing,
I have the same mastervolt gen (with 19hrs only, on a boat we recently purchased) which seems to be suffering from the same problem. I was wondering whether I could ask for some tips as to how to bypass it, as well as info regarding were to get the part. Thanks! and a happy new year.
I had endless problems with my MV Whispergen 3500 during a round the world cruise. Some of this was caused by faulty sensors. With the oil pressure one all you need to do is to disconnect both leads to the sensor and short them together. But, be aware that your oil pressure may indeed be low and the sensor may be working perfectly! Both my oil pressure and exhaust temp sensors developed faults. The exhaust temp easy to check - you should be able to keep your finger on the exhaust stub near the sensor without pain when the gen is running. If you can't the temp is too high. On my set the control panel was mounted on the generator and the vibration caused all manner of failures, once I had repaired it I made up leads to mount it away from the generator itself. Mastervolt in the UK helped me to find the spares I needed.
Good luck!
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Old 17-04-2012, 08:20   #17
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Location: Redondo Beach, CA
Boat: 1990 Oyster 55
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Re: Mastervolt WhisperGen 3500 Problem

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Originally Posted by Seahunter View Post
Firstly, if you don't have the control panel; get one. Most auto shut downs are from low oil pressure. Change the oil. Before adding oil, remove the oil pressure sensor and clean it out with air (or replace). Second issue is overheating. I've seen where the water screen is plugged or the temp sensor is faulty and the genset shuts down. The other issues are a modified program. You'll need to have someone come out to restore the program to factory specs.
A friend in Panama is having a similar issue, generator (with masterview easy) starts, runs for a few seconds (at what appears normal speeds from his description) and then shuts down with "low oil pressure" indicator.

Shipped him a new oil pressure sensor with same result.

Tried the factory recommended bypass of disconnecting the wire to the oil pressure sensor and then shorting to ground right after the generator starts (apparently the latest version requires seeing a transition from low to high oil pressure during start sequence or it will shut down assuming the sensor is bad).

Verified that the wiring is good between the sensor and the logic board.

So far, nothing will keep it running. The system just recycles and starts up again shuting down shortly after with the low oil pressure indication.

He is stuck in Panama with the issue and I have run out of suggestions.

Any thoughts?

1) would the computer show something different for coolant temp or exhaust gas temp (in the previous unit these were all on the same circuit but this is the newer version of the generator) in the prior version we would loose the exhaust gas temp sensor every couple of years.

2) is it likely for the computer to fail and cause this type of behavior?

3) Possible fuel lift pump failure? Is there a sensor for fuel pressure it sounds like a deliberate shutdown rather than starvation.

Unfortunately I am not there to help diagnose so only working with his sailmail responses.

Thanks
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Old 28-04-2014, 12:39   #18
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Location: Houston, TX
Boat: Caliber 40 LRC
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Re: Mastervolt WhisperGen 3500 Problem

I have a Mastervolt 3.5KW generator on my Caliber 40 LRC. The generator fuel lift pump is not sufficient to adequately supply fuel to the generator. An auxiliary fuel pump was added to the system and must be turned on manually for the genset to run. Sounds like your generator is fuel starved.
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Old 28-04-2014, 18:58   #19
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Re: Mastervolt WhisperGen 3500 Problem

The generator does in fact have a booster pump as part of the original installation.

Turned out to be bad capacitors in the electrical head. The computer was looking at the output, shutting down the generator, however, the low oil pressure would be the last error so that was the one displayed.

A different time the generator was in fact fuel starved because of bad fuel. Generator would not load up but would not shut down (i.e. produce about 8 amps max). Did not know where the problem was until the main engine started having trouble and chased it to a plugged fuel filter.

So, the mastervolt becomes the bird in the mineshaft!
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Old 23-07-2015, 01:10   #20
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New Mastervolt WhisperGen 3500 Problem

This generator is the gift that keeps on giving!!!

The generator has been shutting down for low AC voltage on a friend's boat. The boat is in Panama again and the local mechanic decided to increase the engine RPM to "fix" the problem. The voltage started at 103V, bumping up the RPM slightly at the governor brought the voltage to 107, continuing to adjust the voltage got to 115V with the AC frequency being 64hz and the engine RPM of 3840.

My concern is that bringing the RPM up to fix the voltage problem may simply be masking an underlying issue.

Anyone have insights into what might be wrong? Perhaps failing caps and the higher frequency is just enough to get them to work mostly ok for awhile?
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Old 23-07-2015, 08:00   #21
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Re: New Mastervolt WhisperGen 3500 Problem

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This generator is the gift that keeps on giving!!!



My concern is that bringing the RPM up to fix the voltage problem may simply be masking an underlying issue.

Anyone have insights into what might be wrong? Perhaps failing caps and the higher frequency is just enough to get them to work mostly ok for awhile?

Bingo!!

Unless this has an adjustable external regulator, the field cap is beginning to break down. Raising engine speed is a very temporary bandaid, but by no mean a fix.


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