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D17 tach question
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John D View Drop Down
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Joined: 12 Sep 2009
Location: Sherman, IL
Points: 360 		Post Options Post Options   Thanks (0) Thanks(0)   Quote John D Quote  Post ReplyReply Direct Link To This Post Topic: D17 tach question
    Posted: 09 Nov 2010 at 7:04am
The hour meter works as it should, but the rpm needle spins around like a helicopter blade. When I disconnect the tach cable at the distributor, I can make it do the same.  I suppose there is something loose inside the tach, but can I get to it or ??? Any ideas? Thanks, John
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DaveKamp View Drop Down
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Joined: 12 Apr 2010
Location: LeClaire, Ia
Points: 5642 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DaveKamp Quote  Post ReplyReply Direct Link To This Post Posted: 09 Nov 2010 at 7:32am
Yeah, either the spring has broken, or come disconnected from the armature.

I've never had one apart... willing to bet that it'll be really obvious when you get it open... if it's a broken spring, you'll need a replacement spring, and then, probably an adjustable speed input and measuring instrument in order to calibrate it.  If it's just disconnected, it might be an easy fix.

I think most guys send 'em to the tachometer doctor down near Kansas City... anybody have a link to 'em?  I don't remember the name, but they're nice people!
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