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Old 17-08-2014, 02:55   #1
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Vetus M3.10 loosing RMP than restores?

Hello,

I have an M3.10 Mitsubish Vetus diesel. It is old but good working.

I started to have a problem with loosing RMP that I can not deal with?

When the engine is working and I go wil 1800 - 2000 RMP for a long distance every 10 - 15 minutes, without touching anything the RMP goes down to around 1000 for 5 - 10 secons and than again goes up to the normal 2000.

Maybe I can see some air bubbles coming bach from to fuel filter to the plasitk hard particles filter (but not sure).

Do you have any idea?
I guess this problem can happend to any diesel engine!

Thanks
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Old 17-08-2014, 03:52   #2
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Re: Vetus M3.10 loosing RMP than restores?

Quote:
Originally Posted by topsi View Post
Hello,

I have an M3.10 Mitsubish Vetus diesel. It is old but good working.

I started to have a problem with loosing RMP that I can not deal with?

When the engine is working and I go wil 1800 - 2000 RMP for a long distance every 10 - 15 minutes, without touching anything the RMP goes down to around 1000 for 5 - 10 secons and than again goes up to the normal 2000.

Maybe I can see some air bubbles coming bach from to fuel filter to the plasitk hard particles filter (but not sure).

Do you have any idea?
I guess this problem can happend to any diesel engine!

Thanks

Check your lines for leakage this problem means air in your system , it will get worse if you don't find the source.Try to check first the last thing you did on the engine ,a service on your engine etc.
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Old 17-08-2014, 10:14   #3
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Re: Vetus M3.10 loosing RMP than restores?

Thank you for the answer!

As I understand I should look for an air intake somewhere into the fuel(diesel) system, before and after filters. I guess the rubber pipelines or?

Is it a problem for the engine if I continue using it while I find the problem? Is it possible to destroy the engine?

Is it possible to take the air from somewhere else, not the diesel lines but from a heating plug or maybe the fuel pump or??

Thank you in advance!
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Old 17-08-2014, 10:21   #4
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Re: Vetus M3.10 loosing RMP than restores?

It could also be a partially clogged fuel line or fuel tank vent line. If you can get your hands on a vacuum gauge to place in the fuel line, after the first filter, you may see something. If you do buy a vacuum gauge get one with a tell tale pointer. Its a pointer that will stop at the highest vacuum the gauge has recorded and will stay there until you reset it.

http://www.proboat.com/the-vacuum-gauge-tool.html

By the way its RPM. Just thought you would like to know.
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Old 17-08-2014, 13:04   #5
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Re: Vetus M3.10 loosing RMP than restores?

Thank you DeepFrz!

Sorry for the mistake.
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