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Old 28-10-2012, 07:44   #1
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New engine hours meter in a Yanmar - How do I adjust the reading?

Hi everyone
I just had a new (tachometer and) hour meter installed on my 3YM20 and the meter reads zero hours.
What is the smart way to adjust the reading to show the real value of 2000 hours without leaving the ignition (which turns on gage lights, etc) for two and a half months?
Hopefully some whiz here will know which are the two specific wires that need power to keep the hours counting but everything else off.. Or alternatively some trick to adjust the reading without waiting 2.5 months..
I am all ears..
C
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Old 28-10-2012, 07:54   #2
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Re: New engine hours meter in a Yanmar - How do I adjust the reading?

I'd just keep track of the actual hours in the ship's maintenance log and not sweat what the meter reads.
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Old 28-10-2012, 08:20   #3
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Re: New engine hours meter in a Yanmar - How do I adjust the reading?

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Originally Posted by Kenomac View Post
I'd just keep track of the actual hours in the ship's maintenance log and not sweat what the meter reads.
Ditto! That's what I've done. I've called the mfgr's of my gauges and they say the hour meters are sealed and can not be adjusted. But to advance one, one just needs to add power to the power lead. It will run whether the motor is running or not. It would have to be on for 84 days to catch up.
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Old 28-10-2012, 09:42   #4
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Re: New engine hours meter in a Yanmar - How do I adjust the reading?

So you have either two months of letting the thing run until it hits zero hours, or five seconds of subtraction math to perform.

Or buy a new meter with all zeroes, I suppose.

Your choice.
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Old 28-10-2012, 21:54   #5
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Re: New engine hours meter in a Yanmar - How do I adjust the reading?

Quote:
Originally Posted by svlamorocha View Post
Hi everyone
I just had a new (tachometer and) hour meter installed on my 3YM20 and the meter reads zero hours.
What is the smart way to adjust the reading to show the real value of 2000 hours without leaving the ignition (which turns on gage lights, etc) for two and a half months?
Hopefully some whiz here will know which are the two specific wires that need power to keep the hours counting but everything else off.. Or alternatively some trick to adjust the reading without waiting 2.5 months..
I am all ears..
C
Is it an hour meter or a tachometer? Different things...

Same basic problem but just applying power to a tach won't make the hours count...
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Old 29-10-2012, 01:47   #6
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Re: New engine hours meter in a Yanmar - How do I adjust the reading?

How nice to hear someone wanting to run the hour meter forward... mostly folks want to know how to turn them back!

But what we did in teh same situation was to post a wee sticker by the meter that said something like "add 2490 hours for total run time".

It seems kinda silly to have to run it for 2k hours just to get to an arbitrary number on the readout.

Cheers,

Jim
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Old 31-10-2012, 17:28   #7
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Re: New engine hours meter in a Yanmar - How do I adjust the reading?

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Originally Posted by Ex-Calif View Post
Is it an hour meter or a tachometer? Different things...

Same basic problem but just applying power to a tach won't make the hours count...
The digital hour meter and tacho are integral on the Yanmars.
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Old 31-10-2012, 18:55   #8
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Re: New engine hours meter in a Yanmar - How do I adjust the reading?

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Originally Posted by NoTies View Post
The digital hour meter and tacho are integral on the Yanmars.
Not on my 3GM30's: The tach is in the instrument panel at the steering station in the cockpit while the hour meters are inside the cabin on the bulkhead above the navigation table.
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Old 31-10-2012, 20:49   #9
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Re: New engine hours meter in a Yanmar - How do I adjust the reading?

I actually did the hooking up thing when I got tired of replacing hour meters which kept giving up the ghost (Mechanical type with points and solenoid rewind).
I got a digital one used with something like 7000 hours on it and wanted to make it read the real number of 3400 or whatever it was, so I hooked it up to 12 volts on my work bench, did the math and disconnected it at the proper time. It reminded me of waiting for an eBay auction to end so I could snipe at the last second...
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Old 31-10-2012, 22:07   #10
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Re: New engine hours meter in a Yanmar - How do I adjust the reading?

All ive ever done was log it with the old hours , and the date ect and a reminder to add the old hours to whats shown on the meter. That way if ya sell it ya can point the log note to the new owner. Always worked for me.
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Old 01-11-2012, 01:25   #11
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Quote:
Originally Posted by NoTies
The digital hour meter and tacho are integral on the Yanmars.
Integral or not a tachometer is tied to the revolutions of the engine at a "spec" rpm. It is signaled usually by the alternator.

An hour meters is just a clock.

Anyway moot point. I've never seen either one that could be adjusted.
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Old 02-11-2012, 14:53   #12
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Re: New engine hours meter in a Yanmar - How do I adjust the reading?

Put it in the ships log. I keep an engineering log much like an aircraft engine log that details what has been done to the engine. Simple enter the hours from the old hour meter in the log and date it was replaced with new one. We do it all the time in airplanes.
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