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Old 13-05-2015, 16:07   #1
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Yanmar B panel lights

Can someone tell me the meaning of L.O. Filter warning light on the Yanmar B Panel.

It is not Oil Pressure That has a light of its own.

I have called 2 Yanmar service companys and still have no answer.

Thanks
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Old 13-05-2015, 16:32   #2
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Re: Yanmar B panel lights

How about a photo?
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Old 13-05-2015, 16:57   #3
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Re: Yanmar B panel lights

For which model engine?

FWIW, there isnt any L.O.Filter light on my 2GM20 B panel.
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Old 13-05-2015, 17:06   #4
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Re: Yanmar B panel lights

Quote:
Originally Posted by SilentOption View Post
Can someone tell me the meaning of L.O. Filter warning light on the Yanmar B Panel.

It is not Oil Pressure That has a light of its own.

I have called 2 Yanmar service companys and still have no answer.

Thanks
My Yanmar YM-series manual shows only 4 lights in the "new B-type panel" made by VDO:
  • Coolant high temp
  • Engine low oil pressure
  • Water in sail drive
  • Battery low charge

Arenīt you confused with the C panel of the same vintage? That one also has gauges for oil pressure and coolant temperature gauges, both of which have a built-in light), which frees up space for two more lights:
  • Water in Fuel Filter
  • Insufficient Seawater Flow

Can you show us a photo of the symbol of the light you are referring to? See attached pages of Yanmar manuals that may be relevant.
Attached Files
File Type: pdf Yanmar C Panel.pdf (110.6 KB, 108 views)
File Type: pdf Yanmar B Panel.pdf (114.4 KB, 141 views)
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Old 13-05-2015, 17:12   #5
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Re: Yanmar B panel lights

Of course, if you have the wiring diagrams, you see what transducer is wired to the light
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Old 16-05-2015, 12:09   #6
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Re: Yanmar B panel lights

If I had wiring Diagrams I would solve the mystery...I don't have them.
It is a B Panel
I'll take a photo and then learn how to post photos I haven't mastered that yet
I have looked at hundreds of B panels with idiot lights and have not seen the light on any photo or seen mention of it anyplace.

when I get more info I'll post it
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Old 16-05-2015, 15:30   #7
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Re: Yanmar B panel lights

Again, what engine model?
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Old 16-05-2015, 17:28   #8
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Re: Yanmar B panel lights

4jh somthing
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Old 17-05-2015, 04:10   #9
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Re: Yanmar B panel lights

Quote:
Originally Posted by SilentOption View Post
4jh somthing
OK after reading the 4JH3 operation manual, I guessing it is really a F.O. Filter lamp.
F.O. (Fuel Oil) is Yanmar's terminology for diesel fuel and this lamp will illuminate "when the drain inside the water separator in the fuel filter becomes excessive".

Quote is from 2.5.1. of the above manual. Note, this applies to the "New C" Panel rather than the "B" Panel. The New C Panel is the one with Water Temperature and Oil Pressure gauges and the hour meter housed inside the tachometer. The alarm lamps are under the water temp. and oil press. gauges.
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Old 17-05-2015, 05:20   #10
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Re: Yanmar B panel lights

Chapter 9 ➥ http://sagaforumet.com/yanmar-manual...kapittel_9.pdf
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Old 17-05-2015, 18:55   #11
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Re: Yanmar B panel lights

Thanks Gord I was looking at that diagram and they don't list the fuel filter light which I have and they don't have L.O. Filter light which I have. clearly options.

I haven't found a Yanmar service rep yet who has seen the one I have lit up.

The boat came over from France. I guess they were just options common there.

I have decided it's Lube Oil Filter...I assume it means its time to change it. How that is determined I have yet to ascertain. The fuel filter has a pressure switch on the bottom of it. The oil filter is just a screw on filter.

So I have the lights and switched listed Oil Pressure, Temp and Voltage plus two more not listed on any Yanmar diagram.

Oh well I have bigger fish to fry at the moment I'll get back to it.
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Old 17-05-2015, 18:58   #12
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Re: Yanmar B panel lights

Wot I have the fuel oil filter light and L.O filter light
No longer a worry. I am headed to France next month I'll go to the source of the install and solve the puzzle.
And if I get no answer I'll be in Japan soon.
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Old 18-05-2015, 03:45   #13
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Re: Yanmar B panel lights

Yep, looks like you are right, Lube Oil Filter, it appears on the D type panel in Gords link.

Please update us with whatever you find out in France!
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Old 15-06-2015, 09:43   #14
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Re: Yanmar B panel lights

All this is turned out to be is the Water in Fuel Sensor. For reasons nobody associated with Yanmar can explain the fuel filter water sensor lights the slot labeled L.O. Filter.

Next dilemma is getting it to turn off. I changed the filter. Cleaned the sensor, tried a different fuel source and the light remains on.

Think I'll just remove the bulb and pretend it was never there.
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Old 17-10-2015, 03:20   #15
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Re: Yanmar B panel lights

Hi silent
Check the wire to the oil pressure switch. It may have come off.
If this doesn't fix it, take out the oil pressure switch (on the side of the block as per diagrams in the manual )and check or get it checked.
Probably not a good idea to just disable the light, alarm etc, its your only indicator.
Check all wiring.
Hope this helps

Good luck with it all.
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