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Old 23-04-2020, 11:42   #1
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Yanmar 4JH3E

I have a Yanmar 4JH3E N/A 54 HP engine in our year 2000 Beneteau Oceanis 461

Trying to replace the gauges and trying to find out if we have American or European resistance gauges....BUT when i look at the temperature senders on the front of the engine i see TWO!!! senders

Can someone explain why there are two and what are their functions



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Old 23-04-2020, 11:48   #2
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Re: Yanmar 4JH3E

One should be the SENDER for the temperature gauge. The other is the SWITCH for the over-temp alarm. You can tell which is which by looking at the wire color and checking the wiring diagram.

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Old 23-04-2020, 23:25   #3
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Re: Yanmar 4JH3E

At some point you should get your hands on a wiring diagram. If you are going with AC/DC for your replacements, please PM me.
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Old 24-04-2020, 02:14   #4
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Re: Yanmar 4JH3E

Greetings and welcome aboard the CF, David.

Yanmar Service Manual

I encourage anyone, who downlaods useful documents, from links (links often go ‘dead’ with time), to then upload the document to our CF Document Library Downloads: ➥

Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"

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Old 24-04-2020, 23:15   #5
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Re: Yanmar 4JH3E

You can probably learn what type of senders you now have installed to mate with your old gauges by looking at this table on the Faria site:

It shows the resistance range for the 3 American senders that are resistive (oil pressure, fuel level and temperature). They are all the same R range, 33 to 240 Ohm.

The European senders use all different R range from one another as shown.

Checking the fuel sender is easy and you can check oil pressure at zero psi. The thermistor for temperature is a bit tougher but you can probably figure that out too. If the originals are Yanmar gauges they might even have their own protocol. Be sure to break the sender circuit while measuring Ohms. I think most Yanmar senders on the engine use the BSP pipe threads and, not a match for NPT threads. Adapters can be had or made though.
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