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17-08-2019, 20:29
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#1
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Registered User
Join Date: Jun 2015
Location: Sydney Australia
Boat: Lagoon 450
Posts: 70
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Yanmar engine starts but power buzzer does not turn off/ no tacho
I can start my Yanmar engine as usual but the power buzzer does not turn off and the tacho does not display revs. If I turn off the power switch the engine continues to run and the buzzer stops but of course the instrument panel is off. I can then turn the power switch back on and press the stop switch and the engine stops as usual, and then I turn off the power switch to stop the buzzer.
Any advice on how to diagnose /fix? Am i causing any damage by running the engine with the instrument panel turned off?
Thanks!
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17-08-2019, 21:02
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#2
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Registered User
Join Date: Feb 2016
Location: So Cal
Boat: Lancer 44 Motor Sailer
Posts: 560
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Re: Yanmar engine starts but power buzzer does not turn off/ no tacho
Just a hunch, I would look at alternator output.
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17-08-2019, 21:14
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#3
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Registered User
Join Date: Jun 2015
Location: Sydney Australia
Boat: Lagoon 450
Posts: 70
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Re: Yanmar engine starts but power buzzer does not turn off/ no tacho
Quote:
Originally Posted by Diesel Bill
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Yep ... on my way back to the anchorage to check fan belt etc cheers
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18-08-2019, 00:06
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#4
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Registered User
Join Date: Jan 2012
Location: Long Island, New York
Boat: Beneteau 423 43 feet
Posts: 850
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Re: Yanmar engine starts but power buzzer does not turn off/ no tacho
I thought you weren’t suppose to turn the switch off until you stopped the engine. .... causes problems.
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18-08-2019, 00:35
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#5
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Moderator and Certifiable Refitter
Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 20,241
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Re: Yanmar engine starts but power buzzer does not turn off/ no tacho
Presumably the idiot lights are OFF (???) i.e. you don't have a low oil pressure or high water temperature alarm or charge light.
What model Yanmar?
Is this happening on one engine only?
Running with the power switch OFF is not going to cause any immediate damage to the engine except that you have shut down the engine alarms which sort of means you are running blind.
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
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18-08-2019, 03:40
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#6
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Registered User
Join Date: Jun 2015
Location: Sydney Australia
Boat: Lagoon 450
Posts: 70
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Re: Yanmar engine starts but power buzzer does not turn off/ no tacho
Quote:
Originally Posted by Wotname
Presumably the idiot lights are OFF (???) i.e. you don't have a low oil pressure or high water temperature alarm or charge light.
What model Yanmar?
Is this happening on one engine only?
Running with the power switch OFF is not going to cause any immediate damage to the engine except that you have shut down the engine alarms which sort of means you are running blind.
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Yes warning lights are off (and never came on apart from usual start up procedure)
4JH5E
Only on one engine - other fine (Lagoon450)
Thanks for the info
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18-08-2019, 08:57
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#7
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Registered User
Join Date: Mar 2012
Location: San Diego Ca
Boat: Hunter, 420 Passage
Posts: 64
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Re: Yanmar engine starts but power buzzer does not turn off/ no tacho
Check all leads to ignition switch coming in and going out.
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18-08-2019, 08:58
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#8
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Registered User
Join Date: Jul 2015
Location: West Palm Beach, FL
Posts: 100
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Re: Yanmar engine starts but power buzzer does not turn off/ no tacho
I would have immediately checked oil and coolant levels. If they are both fine, you are in a much less worrisome position about the buzzer.
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18-08-2019, 09:03
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#9
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Registered User
Join Date: Aug 2006
Location: Skagit City, WA
Posts: 25,453
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Re: Yanmar engine starts but power buzzer does not turn off/ no tacho
Quote:
Originally Posted by NYSail
I thought you weren’t suppose to turn the switch off until you stopped the engine. .... causes problems.
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Depending on how the boat is set up, yes , it can blow the alternator.
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard
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18-08-2019, 09:05
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#10
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Registered User
Join Date: Jan 2015
Boat: Lagoon 450 F
Posts: 159
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Re: Yanmar engine starts but power buzzer does not turn off/ no tacho
Doesn't the battery light come on? It should light up at every start? If the buzzer stops when you accelerate (even when idling), then the battery may be empty or broken, or the wire from the alternator does not tell the panel that the starter battery is charging, or the Batterie does not tell the alternator.
Here was another thread with a similar problem: the fan of the engine ventilation led to the failure of the fuse between alternator and battery switch or something similar.
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18-08-2019, 09:33
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#11
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Registered User
Join Date: Feb 2015
Boat: Land bound, previously Morgan 462
Posts: 1,991
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Re: Yanmar engine starts but power buzzer does not turn off/ no tacho
Quote:
Originally Posted by Cheechako
Depending on how the boat is set up, yes , it can blow the alternator.
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I am not sure you are correct. Turning off ignition switch while engine is running will remove field current to the alternator, if an external regulator is used. External regulator gets its power from ignition switch. Removing field excitation should reduce alternator output to nearly zero. If internal regulator there is probably no change in alternator conditions.
Did I miss something?
Of course this assumes a direct connection from alternator to at least one battery at all times. Never heard of a setup where there was a relay in that connection that had to be powered from the ignition switch, but suppose it is possible as a protective measure.
BTW ignition switch usually powers the hour meter also, so if you run engine very long without proper ignition circuit function or leave a functioning ignition on when engine not running your hour meter will be wrong.
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18-08-2019, 10:01
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#12
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Registered User
Join Date: Dec 2012
Boat: Jeanneau SO45.2
Posts: 384
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Re: Yanmar engine starts but power buzzer does not turn off/ no tacho
What “power buzzer”? My Yanmar has a warning buzzer for any alarm light, normally the low oil pressure alarm sounds when first started until pressure comes up, usually in a few seconds. Could also be due to the (no) charge warning light. If yours keeps sounding, you need to figure out why and fix that.
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18-08-2019, 11:04
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#13
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Registered User
Join Date: Mar 2015
Location: Dundee Scotland, Currently cruising the Baltic Sea
Boat: Vancouver 32
Posts: 35
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Re: Yanmar engine starts but power buzzer does not turn off/ no tacho
Hi, its not a “power buzzer” its a low oil pressure alarm and could be very serious to the health of the engine. You may have noticed that when the engine is cold and you stop it (with the ignition still on) it takes a few seconds until the buzzer comes on again? This is because the oil is cold and thicker.
Do not continue to run the engine until you have at the very least checked the oil level on the dip stick. If there is plenty of oil, it could be an oil filter problem, change the filter if you have one.
Best case scenario is it could be a faulty oil pressure switch. (Or even the wire for it has come of and is shorting to earth!) You need to get this properly diagnosed BEFORE running the engine again, worst case is serious mechanical damage to the engine.
And NEVER turn of the ignition switch when the engine is running, (unless it is designed with an electric engine stop and specifically tells you in the instructions to do so) it could (and May already have) blown the alternator diodes (which may be the reason the tacho is not working!
Sorry for the bad news.
Colin
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18-08-2019, 13:18
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#14
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Registered User
Join Date: Jan 2014
Location: Ft. Lauderdale
Boat: Watkins 29
Posts: 409
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Re: Yanmar engine starts but power buzzer does not turn off/ no tacho
What model Yanmar? 2GM Tamara get the tach signal from a sensor on the bellhousing that counts teeth on the flywheel!
My guess is that if you indeed have a 2GM engine, the tach and oil pressure warning are loosing electrical connection at one of the connector plugs in the engine harness.
Suggest you trace the wires from the oil pressure sensor into tge harness, and disconnect the connector plugs and clean the connections carefully. Don't worry about the connection, they can only go one way!
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18-08-2019, 15:52
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#15
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Registered User
Join Date: Sep 2007
Location: Queensland, Australia
Boat: None at present--between vessels. Ex Piver Loadstar 12.5 metres
Posts: 1,475
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Re: Yanmar engine starts but power buzzer does not turn off/ no tacho
Your alternator voltage regulator may be kaput, or the brushes on the slip rings in the alternator worn out.
Annoying--but not a biggie--less than a hundred bucks--
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