Guts of a tach

[mikebc]

Hey everyone,<br /> <br /> My tach quit a couple of weeks ago after working on and off for a year. I've checked all the voltages and grounds to the tach, all are good. I am about to try and take the tach itself apart and test the internals out. Does anyone have a diagram for the internals of a tach? I realize they are all slightly different, but the basic principals have to be the same. Just trying to save $50 on a new tach, plus I enjoy fixing stuff, or breaking it beyond repair, either way! I have a digital multi meter and know how to use it very well. The tach is original and it's on a '87 3.0 mercruiser craft. Thanks for any input!

 

[trog100]

Re: Guts of a tach

never actually pulled one apart.. but i think u are right about the basic pricples being the same.. they kinda read the pulses from the points i would guess.. the magetic bearing arrangement that moves the needle is probably the bit most likely to fail..<br /><br />i dont hold out much hope as regards fixing it.. but no harm in trying.. u might learn something along the way.. he he<br /><br />see if this place throws up any help..<br /><br /> http://www.howstuffworks.com/ <br /><br />trog100

 

[mikebc]

Re: Guts of a tach

I'll give it a try and post pics of my findings. My best guess is that some kind of winding wire is broken or rusty.

 

[mikebc]

Re: Guts of a tach

No go,<br /> It's a sealed unit, the face does not come off. Off to the parts store I go. That hole in the water sure is.....