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  •  » Ford 3G Alternator Dimensions-Small Case

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    2/03/2019 9:27 PM  #1

    1fststang
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    Registered: 6/02/2013
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    Ford 3G Alternator Dimensions-Small Case

    Just installed my engine recently and i'm using a March Serpentine Belt set up that has my AC compressor on passenger side(low) with the Alternator above it.

    I'm using a large case 3G alternator, can't remember what car it was made for but remember its a large case.

    Well I just tried to install the total control monte carlo bar and it hits the alternator as it sits a little high using this set up.

    I'm wondering if a small case would give me more room for the bar?  Anyone have dimensions on the small case?  
    The bar is hitting right where the top bolt mounts and I need about an inch more clearance.

     

     

    2/03/2019 9:57 PM  #2

    6sally6
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    From: Surfside Beach,SC
    Registered: 4/02/2013
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    Re: Ford 3G Alternator Dimensions-Small Case

    Curved bar or straight?
    6s6

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    2/03/2019 11:21 PM  #3

    50vert
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    From: QLD Australia
    Registered: 4/01/2013
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    Re: Ford 3G Alternator Dimensions-Small Case

    The mounting ears are still gunna be 7" apart.

    Last edited by 50vert (2/03/2019 11:23 PM)

    "Those telephone poles were like a picket fence"
     

    2/04/2019 9:13 AM  #4

    TKOPerformance
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    From: Newark, DE
    Registered: 12/15/2014
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    Re: Ford 3G Alternator Dimensions-Small Case

    In 'merican that's about 1/2" larger in diameter.  5.3" vs. 5.8".

     

    2/04/2019 10:36 AM  #5

    1fststang
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    Re: Ford 3G Alternator Dimensions-Small Case

    Looks like my spacing for the mounting ears is over 8" so I'm thinking finding a different alternator might be a solution.  After looking all over the web I have found some info that there is a 7" spacing and an 8.25" which is what I believe I have.

       •Thread Starter
     

    2/04/2019 1:29 PM  #6

    TKOPerformance
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    Re: Ford 3G Alternator Dimensions-Small Case

    Any reason you felt you needed the large case?  I know they're higher amp, but do you really need it?  I run the 90 amp small case and it works just fine for my car (electric fan, stereo with two amps, power windows). 

     

    2/04/2019 2:58 PM  #7

    1fststang
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    Re: Ford 3G Alternator Dimensions-Small Case

    I will have dual electric fans but nothing else out of the ordinary. 

    I didn't envision the large case causing me a problem but that's what happens when you start modifying and using lots of aftermarket stuff.

    I wanted serpentine because of the ac compressor and alternator are prone to slipping especially the alternator.

    The alternator does sit kind of high but I do like the ac compressor down low on the passenger side it will clean things up with the lines etc. Plus if you ever need to pull an engine you can unbolt it and just move it out of the way.  I was thinking about running the lines in the wheel well area then coming thru the fender apron right where the compressor is.  Maybe even a bulk head there for the lines but then decided to much work and not really necessary.

       •Thread Starter
     

    2/04/2019 3:42 PM  #8

    TKOPerformance
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    From: Newark, DE
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    Re: Ford 3G Alternator Dimensions-Small Case

    If the small case one fits I'd just run that.  I'm sure you can probably sell the big case one for what the small case on will set you back. 

     

    2/04/2019 5:21 PM  #9

    50vert
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    From: QLD Australia
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    Re: Ford 3G Alternator Dimensions-Small Case

    1fasting, your pic shows 2 large case 130A alts.
    The difference being the spread of the mounting ears. I THINK the larger is a truck application.
    I'd probably be looking for a junk alt, and swap the front case over.
    I'm using a 130A on mine, cos it was factory on my donor car.

    "Those telephone poles were like a picket fence"
     

    2/04/2019 6:20 PM  #10

    josh-kebob
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    From: Madison, AL
    Registered: 4/06/2013
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    Re: Ford 3G Alternator Dimensions-Small Case

    For what it's worth, I'm running a serp system and found a 3g alt on a 2003 mustang at the local pull a part. It was a newly rebuilt alt and I got a deal on it. Mounting points are 7 inches apart and the case measures 5.5 inches across.

     

     

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