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Yanmar Tacho

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JonB View Drop Down
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    Posted: 14 August 2018 at 15:34
According to chapter 9 of the Yanmar electrics manual, the tacho works off a sensor that measures the flywheel turning. Has any one found where that is as I can't see one. This is the 4JH4E engine. Or was there a change over to take readings from the alternator?
Jon B
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jeb View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jeb Quote  Post ReplyReply Direct Link To This Post Posted: 14 August 2018 at 19:00
On the smaller engines (like YM20, YM30 3JH the tacho is feed from the W winding on the alternator. I guess it's the same for 4JH.
Jesper
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JonB Quote  Post ReplyReply Direct Link To This Post Posted: 15 August 2018 at 22:07
Thanks Jesper,

Would make sense, I suppose I need to take the rev counter off and test it. Increasing the voltage should increase the revs if its from the alternator.


Edited by JonB - 15 August 2018 at 22:07
Jon B
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jeb Quote  Post ReplyReply Direct Link To This Post Posted: 16 August 2018 at 06:47
It is actually counting pulses. The AC of the alternator is feed thrue a "half bridge" of diodes giving 3 pulses per electrical revolution. On mine it's a yellow cable comming out of the Alternator and on the electrical drawing it is marked with a "P" on the tacho. I have a manua covering 4JH4AE, 4JH4-TE and 4JH4-HTE.
Jesper
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JonB Quote  Post ReplyReply Direct Link To This Post Posted: 16 August 2018 at 12:12
That infers it's what I call an electrical rather than a manual one.

My 'manual' is just chapter 9 of the 4JH electrical but shows a 'manual' take off for the tacho close to the starter motor on the bell housing, which will be why I can't find it.

I've changed my standard alternator to a 100amp Balmar so I'll see if I've a loose connection.

Thanks for the input
Jon B
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http://www.norse-king.blogspot.co.uk
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