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Old 09-04-2021, 20:41   #1
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Volvo penta Tamd40a tacho.

Hi am new on here, i have a 26ft mariner pacer flybridge.
And i have been trying to upgrade/repair the instrument panel because its all old and deteriorated.

I bought and new aftermarket tachometer now my problem is the old one has two inputs for the sensor ( G & W ) the new tacho only has one sensor input, i am hoping one is only an earth, the wiring diagram i have doesnt help much. And the engine being old it is hard to find information on it.

Hopefully someone here will be able to help me out

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Kel
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Old 10-04-2021, 04:29   #2
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Re: Volvo penta Tamd40a tacho.

Greetings and welcome aboard the CF, Kel.
I expect you're correct, that the Green wire is Negative Ground.
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Old 16-04-2021, 18:50   #3
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Re: Volvo penta Tamd40a tacho.

So this is the wiring diagram i have, from what i can see the tacho sensor(#19) on the motor has 2 wires and they both go up to the gauge and plug into pins 'G' and 'W' in the back of the gauge.

The new guage only has one sensor input, can i just connect one wire to the guage and put the other to earth.
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Old 16-04-2021, 19:29   #4
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Re: Volvo penta Tamd40a tacho.

The tach sender on the Tamd 40 engine is an inductive sender, and it basically counts the teeth on the injection pump drive gear and sends a pulse to the tach every time a tooth passes the tip of the sender. To generate the pulse both leads from the sender need to create a complete circuit, basically one leg out, one leg back.

Whether this can happen with the tach that you have, of course depends on the internal circuitry of the tach, and probably the manufacturer of the tach can tell you whether itís possible, and how to wire it.

Off the top of my head I think there are 30 pulses per crankshaft revolution generated by the sender on your engine.

If youíre interested, I think I have an original new tach for a 40 series engine, and maybe a complete new panel. Have to check...
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Old 22-04-2021, 21:58   #5
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Re: Volvo penta Tamd40a tacho.

Quote:
Originally Posted by DougR View Post
The tach sender on the Tamd 40 engine is an inductive sender, and it basically counts the teeth on the injection pump drive gear and sends a pulse to the tach every time a tooth passes the tip of the sender. To generate the pulse both leads from the sender need to create a complete circuit, basically one leg out, one leg back.

Whether this can happen with the tach that you have, of course depends on the internal circuitry of the tach, and probably the manufacturer of the tach can tell you whether itís possible, and how to wire it.

Off the top of my head I think there are 30 pulses per crankshaft revolution generated by the sender on your engine.

If youíre interested, I think I have an original new tach for a 40 series engine, and maybe a complete new panel. Have to check...

Ok thanks for the information. I am thinking my aftermarket one wont work with this sender.
It would be great to have an original panel it would make my life so much easier. If you do have one id be happy to buy it off you
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Old 26-04-2021, 05:15   #6
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Re: Volvo penta Tamd40a tacho.

Pacer,
The tach that I have is not for a tamd 40 engine, but for a tamd41 series engine and the pulse rate for the 41 is different than the 40, so it wonít work for your engine. This tach is not adjustable.

Earlier I stated that the pulse rate for your engine was 30 pulses/ crank revolution, but that is incorrect. The correct rate is 33 pulses/ crank revolution.
Sorry I couldnít help.

You can buy a ďuniversalĒ tach from Volvo Penta that can be set to read the correct pulse rate for your engine, and Iím sure you can also get one from VDO or numerous other suppliers that will work as well. Just tell them itís a two wire inductive sender with 33 pulses / crank revolution.
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