Mondial 3.2 Tach | FerrariChat

Mondial 3.2 Tach

Discussion in 'Technical Q&A' started by R Whitney, Jul 29, 2009.

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  1. R Whitney

    R Whitney Rookie

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    Randle Whitney
    My Mondi 3.2 is reading one half the real revs on the tach. Where is the lead from the coil(s)? The problem was intermittent until lately. Now it is constant. Seventy MPH does not equal 1500 revs. HELP!!!
     
    R Whitney, Jul 29, 2009
    #1
  2. Wade

    Wade Three Time F1 World Champ Owner

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    ;)
     
    Wade, Jul 29, 2009
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  3. BOKelley

    BOKelley Formula 3 Silver Subscribed

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    I just fixed my own.....it is fairly simple job to pull the tach from the dash and open the case up. I had read that the problem is usually due to dirty contacts on the needle so once apart, I manually rotated the the needle from stop to stop several times and then used canned air to blow off the contact path. Once back in the car, the unit worked as new.

    A word of caution, the inner workings are very delicate. The tach needle spring is basically a watch spring on fragile bearings and can be easily damaged so when handling the needle I made sure motions were slow and gentle. Likewise with the air...short bursts at far less than full force and none directed at the spring. Not a particulary difficult dissassembly and reassembly but best advised to pay close attention to how things came apart. So the job may not be for the faint of heart or fumble of fingers... ;)

    Brock
     
    BOKelley, Jul 29, 2009
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  4. R Whitney

    R Whitney Rookie

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    Sounds like great ideas. How do you get the tach out? Does it snap in? I do not see any screws or other means of disassembly. Whit
     
    R Whitney, Jul 30, 2009
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  5. R Whitney

    R Whitney Rookie

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    With the help of the exploded diagram and a skinny home made tool, I finally figured it out. The cover snaps on to reveal the mounting hardware. Thank you for your help. Whit
     
    R Whitney, Jul 30, 2009
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  6. R Whitney

    R Whitney Rookie

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    BOKelly: Did what you said to do and it is working like new. Do smarts run in your family or do you train for it?? THANK YOU. Whit
    ( The whole job took less than an hour, most of the time was spent being VERY gentle with the innards ) Thanx again
     
    R Whitney, Jul 31, 2009
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  7. Wade

    Wade Three Time F1 World Champ Owner

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    That's awesome and I hadn't realized it was that simple. Thanks for the update.
     
    Wade, Jul 31, 2009
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  8. BOKelley

    BOKelley Formula 3 Silver Subscribed

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    I have been called a real f@rt smeller if that counts ;) .....chalk it up to adventurous spirt, extreme curiosity and the unquenchable desire to try and fix before forking out the cash. Besides, I have always found that my vehicles appreciate my taking an active role in their well being......Happy to be of help....

    Brock
     
    BOKelley, Jul 31, 2009
    #8

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