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Author Topic:   Tachometer Zero
sheikofthesea posted 04-13-2007 04:14 PM ET (US)   Profile for sheikofthesea   Send Email to sheikofthesea  
I just bought a [Boston Whaler 190 MONTAUK], and it has a dial-face tachometer. The problem is that it doesn't start at zero but rather right around 900-RPM. When I power up it does not drop down either. I am assuming that it is just off and that when it says I am going 4,500-RPM I am really going 3,600-RPM. Is this a good assumption? Should I worry about it?
jimh posted 04-13-2007 09:38 PM ET (US)     Profile for jimh  Send Email to jimh     
On most tachometers the dial indicator does not have a return to zero, and, when the power is off, the dial pointer will indicate somewhere up scale from the zero. However, when the power is applied, before the engine starts, the tachometer should return to zero--at least that is my best recollection. You've got me wondering about that myself!

Have the dealer check it for you. It will be covered under the new boat warranty and should be replaced if there is any problem.

sheikofthesea posted 04-14-2007 12:09 AM ET (US)     Profile for sheikofthesea  Send Email to sheikofthesea     
thanks, I will pursue it, you are the best.
Chuck Tribolet posted 04-14-2007 02:34 AM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
What does it read at idle?


Chuck

sheikofthesea posted 04-14-2007 09:28 PM ET (US)     Profile for sheikofthesea  Send Email to sheikofthesea     
The pointer sits at 900 rpms and when the boat is at idel it doesn't move, stays at 900 rpms. Then when I apply throttle it goes up but of course it 900 pms higher thna it should be. The boat seems fine so I am not worried about it, and I don't want to take it back to the dealer right now when I am having so much fun.
bluewaterpirate posted 04-14-2007 10:06 PM ET (US)     Profile for bluewaterpirate  Send Email to bluewaterpirate     
If it's a Mercit should read 500 rmps after ignition. If your getting false movemets at idle and other rpms, check for condensation. If you find some clean the connections and put dilectric grease on them afer you've cleaned them.
sheikofthesea posted 04-15-2007 10:42 AM ET (US)     Profile for sheikofthesea  Send Email to sheikofthesea     
Just making sure people understand what I am saying. When the boat is off the tachometer reads 900 rpms. When I turn the boat on and it is idling it reads 900 rpms. When I apply throttle it goes up. My assumption is that it is just set in the wrong place and that when the tachometer says I am at 3500 rpms I am really at 2600 and when I am at 7000 I am really at 6100 and so on. Do people think that this is the case?
Frank O posted 04-15-2007 11:33 AM ET (US)     Profile for Frank O  Send Email to Frank O     
Sheila, to answer your question definitively I think you'd have to check it against a reference tachometer while you're running. I had the same behavior with the 10-year-old tach on my 1995 Outrage 21. However, I took the easy way out and just put in a new tach.


Frank O posted 04-15-2007 11:33 AM ET (US)     Profile for Frank O  Send Email to Frank O     
Shoot, Sheik -- misread the name. My apologies!

bluewaterpirate posted 04-15-2007 11:57 AM ET (US)     Profile for bluewaterpirate  Send Email to bluewaterpirate     
My merc tac reads 900 when off and when I start my Opti it drops back to 500. That is normal as Jim pointed out. Merc tacs don not read zero when off.

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