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31-05-2016, 05:54
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#1
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Senior Cruiser

Join Date: Jan 2011
Location: Oriental, NC
Boat: Baba 40
Posts: 469
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Yanmar (VDO) tach/engine hrs
I have one of those pesky LED engine hour gauges on my Yanmar that has died and tried the previously posted fix to no avail. I've picked up a DC powered Hobbs meter to remedy the situation and have a quick question on the connection. I assume the ground will go to GROUND (upper right connection), but it appears I have a two choices for the other - TACH SIGNAL or TACH/Hrs (see photo). Intuition tells me it's the latter, but that's the same intuition that gives me the winning lottery numbers, none of which have actually been winners. Same intuition tells me it could be either (a signal being a signal, and all that).
The photo appears to have TACH/Hrs as the... third from the left? Guidance, folks?
Thanks.
Shabby
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31-05-2016, 07:06
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#2
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Moderator Emeritus

Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
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Re: Yanmar (VDO) tach/engine hrs
I don't know anything about your current gauge, but you can wire your new Hobbs so that it's powered and therefore running whenever the ignition is on and not muck with your current tach wiring.
The low oil pressure warning horn keeps people from leaving ignition on, but engine off for more than a couple of seconds, so your Hobbs will be accurate.
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31-05-2016, 08:54
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#3
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Registered User
Join Date: May 2014
Location: Racine, WI
Boat: Paceship PY26
Posts: 60
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Re: Yanmar (VDO) tach/engine hrs
In looking at the pic you have, third from the left is ignition 12V. The other 12V input is for lighting only.
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31-05-2016, 11:29
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#4
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Registered User
Join Date: Mar 2006
Location: Nevada City. CA
Boat: Sceptre 41
Posts: 3,850
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Re: Yanmar (VDO) tach/engine hrs
Just installed a mechanical Hobbs engine hour meter yesterday. Yanmar had the same problem. I don't know the exact hours since it went down. I am hooking mine up to the oil pressure sender. Good luck
__________________
Fair Winds,
Charlie
Between us there was, as I have already said somewhere, the bond of the sea. Besides holding our hearts together through long periods of separation, it had the effect of making us tolerant of each other's yarns -- and even convictions. Heart of Darkness
Joseph Conrad
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01-06-2016, 09:36
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#5
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Senior Cruiser

Join Date: Jan 2011
Location: Oriental, NC
Boat: Baba 40
Posts: 469
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Re: Yanmar (VDO) tach/engine hrs
Thanks, my friends!
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01-06-2016, 09:47
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#6
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Registered User
Join Date: Aug 2006
Location: Skagit City, WA
Posts: 24,725
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Re: Yanmar (VDO) tach/engine hrs
Just wire it to your key switch power. Key on/Hobbs on
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard
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01-06-2016, 10:17
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#7
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Senior Cruiser

Join Date: Jan 2011
Location: Oriental, NC
Boat: Baba 40
Posts: 469
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Re: Yanmar (VDO) tach/engine hrs
Preference is to actually track 'engine running' hours, Plus my engine installer saw fit to drop the Yanmar panel in that saves me the trouble of using a key. The oodles of extra wiring probably baffled him.
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01-06-2016, 10:20
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#8
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Moderator Emeritus

Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
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Re: Yanmar (VDO) tach/engine hrs
You have some form of switch that you turn on to enable the starter, don't you?
When this switch is on, the low oil pressure alarm is on?
A "true" Hobbs install is leave Hobbs powered when ignition is hot, ground wire is connected to an oil pressure switch so that whenever there is oil pressure, the circuit is completed and the Hobbs runs whenever there is oil pressure, assumption of course being that the only time there is oil pressure is when the engine is running
Most of us have some form of "ignition switch" that when this switch is on, the low oil pressure alarm is sounding, seeing as how I've never met anyone that will just let that alarm go off without it annoying them, it's a safe bet that whenever the ignition is on, there is oil pressure and its OK for the Hobbs to be triggered just by ignition voltage, without an oil pressure switch, cause that alarm is not going to allow you to forget to turn off the ignition, whether it be a switch or a key.
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01-06-2016, 16:42
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#9
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Registered User
Join Date: Dec 2012
Location: Mannum, Australia
Boat: Houseboat, 60ft.
Posts: 290
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Re: Yanmar (VDO) tach/engine hrs
Yes it seems like most just record one hour as .... one hour.
Most heavy machinery record hours "at operating revs".
For instance if a bulldozer operates at 1800 rpm then it will record one hour at that revs but at idle .... 900rpm it will only record half an hour for the one hour it's idling.
Maybe that's what that other terminal is for?
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17-03-2019, 06:56
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#10
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Registered User
Join Date: Mar 2015
Location: NC, USA
Boat: IslandPacket Packet Cat 35
Posts: 30
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Re: Yanmar (VDO) tach/engine hrs
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09-04-2019, 04:08
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#11
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Registered User
Join Date: Oct 2017
Location: MAINE
Boat: Cal 39 MKII
Posts: 54
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Re: Yanmar (VDO) tach/engine hrs
Charlie
You wrote in your response - you connect to the oil pressure sender - did you mean oil pressure SENSOR or the oil pressure meter/alarm or the Oil low pressure switch????
Thanks
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09-04-2019, 08:02
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#13
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Registered User
Join Date: Oct 2017
Location: MAINE
Boat: Cal 39 MKII
Posts: 54
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Re: Yanmar (VDO) tach/engine hrs
My problem (4JH4E with C Type instrument panel) is that I cannot get to the back of the panel so I must connect my (+) lead from the hour meter to a wire that goes hot with the on switch. This wire must be accessible near the engine - does anyone have a suggestion???
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10-03-2020, 11:49
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#14
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Registered User
Join Date: Apr 2018
Posts: 46
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Re: Yanmar (VDO) tach/engine hrs
Followed Daydreamer41's post on SBO, plus the video on Youtube, and my Yanmar tach hour-meter now works perfectly again, and shows the original hours. A great solution and actually pretty straight forward, once you get the darn thing out of the tight space its mounted in.
SBO link https://forums.sailboatowners.com/in...4#post-1526660
To be clear, I replaced the LCD with a new one from ebay. See SBO link. The Youtube video is just to show you how to tach the tach apart. The repair in the video (removing the silicon on the LCD ribbon) is proven to not last.
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