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Yanmar Tacho |
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JonB
Rear Admiral Joined: 21 September 2010 Location: Cowes Status: Offline Points: 504 |
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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?
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Jon B
470e http://www.norse-king.blogspot.co.uk |
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jeb
Captain Joined: 05 May 2014 Location: Sweden Status: Offline Points: 226 |
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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.
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Jesper
Hanse 400e |
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JonB
Rear Admiral Joined: 21 September 2010 Location: Cowes Status: Offline Points: 504 |
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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 |
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Jon B
470e http://www.norse-king.blogspot.co.uk |
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jeb
Captain Joined: 05 May 2014 Location: Sweden Status: Offline Points: 226 |
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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.
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Jesper
Hanse 400e |
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JonB
Rear Admiral Joined: 21 September 2010 Location: Cowes Status: Offline Points: 504 |
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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
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Jon B
470e http://www.norse-king.blogspot.co.uk |
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