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Author Topic:   Tach problem
Jakwolf posted 05-06-2006 07:56 PM ET (US)   Profile for Jakwolf   Send Email to Jakwolf  
My boat was getting a washjob today, and I noticed the tach is stuck at 2500. I turned the key on and it dropped to 1200, after bumping the starter. Do tachs get stuck(broken), or should I be looking for a wire problem?
Chuck Tribolet posted 05-07-2006 09:21 AM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
What motor? What tach?

I don't think a wire problem would cause those symptoms.

Did it go back to 2500 when you turned the key off?

Disconnect the tach. If it doesn't read zero, then probably the tach is bad. If it does read zero, keep an eye on your battery, because it's using a least a little bit of power to keep the needle swung.

And what happens when you run the engine? Are the tach readings reasonable?


Chuck

jimh posted 05-07-2006 09:45 AM ET (US)     Profile for jimh  Send Email to jimh     
What is "a washjob"?
Jakwolf posted 05-08-2006 11:57 AM ET (US)     Profile for Jakwolf  Send Email to Jakwolf     
Chuck, my bad,115 Ocean Pro Evinrude. I turned the key off and it stopped at 1800 this time. The tach reports I'm doing 6000 rpm when I know from the tone of the engine and my speed it is incorrect. It does go thru a full range, but that range is more like 1200 - 6000.

Jim, 'washjob' is closely related to 'jimh'. In need of spacing, hehe. PS, I love your profile, very clever.

jimh posted 05-08-2006 12:25 PM ET (US)     Profile for jimh  Send Email to jimh     
I am still not clear on a "wash job"? Could you clarify.

I am trying to understand the relationship between the tachometer malfunction and the "wash job".

You have mentioned the fact that "the boat was getting a [wash job]" when the tachometer malfunction was observed. I have to assume you mean to imply that there is some connection between the tachometer malfunction and the "wash job." Therefore, it is important to understand what a "wash job" might be. Could you explain it.

If you don't think there is any connection between the "wash job" and the tachometer malfunction, could you make that clear so we don't try to establish what the correlation betweent them could be.

Often if electrical instruments are sprayed heavily with water the ingress of water into the instrument enclosure can cause a malfunction. I am trying to understand if you think that happened here.

crabby posted 05-08-2006 05:23 PM ET (US)     Profile for crabby  Send Email to crabby     
My old tach (OMC) that was connected to my old 70hp would leave the needle at whatever point it was at when the key was switched off. It did NOT have the offset problem you mention.
Jakwolf posted 05-10-2006 01:00 AM ET (US)     Profile for Jakwolf  Send Email to Jakwolf     
Jim, sorry, thought you we're attempting humor. The boat was being washed, then I started to play with things. No correlation between the two I'm sure, as I'm very careful when using the hose pressure. I will be more careful to have all my info in order before posting in the future.
jimh posted 05-10-2006 08:58 PM ET (US)     Profile for jimh  Send Email to jimh     
Let me restate the question, as I now understand, and I see there are two possible situations:

SITUATION ONE:

When the engine is not running and no power is applied to the tachometer, the indicator needle points to 2,500-RPM, and, when the ignition key is turned on but the motor is not running, the tachometer indicator points to 1,200-RPM.

--or--

SITUATION TWO:

When the engine is not running and no power is applied to the tachometer, the indicator needle points to 2,5000-ROM, and, when the ignition key is turned on and the engine is started ("the starter is bumped") the indicator points to 1,200-RPM.

Could you confirm which situation you are describing, as it is not clear to me from your initial description if the engine is running or not when the tachometer indicates 1,200-RPM.

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