Can you help identify...

[Mg451]

So going through all my stuff i got in the mail. I got this vdo 340 001 gen sender 7/8-18. Do know what it is or where it goes. Apprently its a tach sensor. I have a yanmar 3gm30f i think i got it deliverd on accident... any ideas

[Joh.Ghurt]

This is a RPM-sensor which converts the revolutions of the speedometer cable into electrical impulses. The slotted white centre of the bottom nut seen in picture 2 should be very easy to rotate. That's where you screw in the speedometer cable.

It's used in cars or motorcycles to translate rotations of a wheel into speed and distance. I doubt it's much use on a boat.

[Mg451]

Hmmm wonder how or why i bought it

[Joh.Ghurt]

Originally Posted by Mg451

Hmmm wonder how or why i bought it

You never should watch Home-Shopping-TV while drunk.

[Mg451]

Cant find anything about it.. msybe i could use it as a 2nd tach off my alternator. Cant find how it works. How does it sense?

[Searles]

It’s a taco sender unit generally connects where the cable drive take off for the rev,counter fits changes cable drive to impulse drive ,verry common on older and bigger diesels ,manny uses. ,❤️⛵️⚓️

[Mg451]

Yes im trying to tbink of "uses" can't even find anything on it..

[Joh.Ghurt]

Originally Posted by Mg451

Cant find anything about it.. msybe i could use it as a 2nd tach off my alternator. Cant find how it works. How does it sense?

You turn the white slotted plastic disk behind the nut at the bottom very quickly. For each turn you should get 4 impulses on the electrical contacts. To make it work you'll need a flexible speedometer cable of the proper dimensions so that the core of the cable fits the slot and the whole cable is held safely by the nut.

[Horus]

Bing:[Vdo V1511001108D] Generator Sender - gacatru.com
https://gacatru.com/v1511001108d
01-08-2014 · Product Attributes: brand=vdo, mpn=v1511001108d, warranty=no warranty, country/region of manufacture=czech republic, sku=4969098428936233, types=sender. VDO V1511001108D Sender Description V1511001108d Vdo Generator Sender. VDO generator sender pulse for use with tachometers or engine synchronize rs designated as type.

[Maver]

Originally Posted by Mg451

So going through all my stuff i got in the mail. I got this vdo 340 001 gen sender 7/8-18. Do know what it is or where it goes. Apprently its a tach sensor. I have a yanmar 3gm30f i think i got it deliverd on accident... any ideas

This a VDO tacho sensor 340.808.001.xxx which was used on a lot off marine engines in combination with a VDO rev counter. It will produce a voltage signal in the range of app. 0-10 Volts. This sensor was mechanica driven by camshaft revolutions; the rev counter has a ratio of 1:2. Most of the marine engines not are using a so called W signal from the generator or an inductive sensor which count the the number of teeth of vi the flywheel.

Regards, Martin V.

[Var Korall]

They are not cheap. Don't trash it.

[BruceS]

Looks like the one I had on my 4-108. (Perkins)

[billgewater]

The better models can be attached to politicians to measure the amount of "spin", although the constant directional changes can damage the sensor.

VDO once made a speed log that relied on a similar sensor connected to a square ended cable. So, possibly this sensor is off a defunct speed log, but an engine application is definitely more likely. I would keep it as it may be useable somewhere.