Alternator Adjustment Arm differences
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From: Houston
Alternator Adjustment Arm differences
I am curious if anyone can shed any light on the differences between the following two adjustment arms.
D9UZ-10145-A : F-U100/250 w/unleaded fuel / Motorcraft 40A, 60A alternator
D9UZ-10145-B : F-U100/250 w/unleaded fuel / Motorcraft 70A, 100A alternator
Im going to be doing a 3G alternator conversion on my truck and I just picked up the 70A/100A adjustment arm new off ebay and wondering how does this arm compare to the 40A/60A alternator arm. I know you have to hammer the arm flat for a 1G to 3G conversion but that is with the common 40A/60A alternator arm and I dont know about this one.
D9UZ-10145-A : F-U100/250 w/unleaded fuel / Motorcraft 40A, 60A alternator
D9UZ-10145-B : F-U100/250 w/unleaded fuel / Motorcraft 70A, 100A alternator
Im going to be doing a 3G alternator conversion on my truck and I just picked up the 70A/100A adjustment arm new off ebay and wondering how does this arm compare to the 40A/60A alternator arm. I know you have to hammer the arm flat for a 1G to 3G conversion but that is with the common 40A/60A alternator arm and I dont know about this one.
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From: Virginia
I would assume the arc in the arm is larger for the larger diameter alternator. I have modified the arms before and they worked fine, but it required cutting and welding so it would clear the alternator housing.
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Lead Driver
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From: Houston
I will be mounting the arm first to the engine on the stand then mock it up with the 3G alternator. Rather do the modifications on the stand than leaning over the fender.
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Joined: Jan 2001
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From: Virginia
If you need serious modifications to the arm or want to keep the original arm intact, I buy the chrome Mr Gasket universal arms sometimes and modify them. It has the curved slot you need and that is hard to fabricate. It's flat but bends easily in a vice and new holes can be drilled once you grind the chrome off where you want to drill the hole.
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Lead Driver
Joined: Apr 2007
Posts: 5,958
Likes: 105
From: Houston
If you need serious modifications to the arm or want to keep the original arm intact, I buy the chrome Mr Gasket universal arms sometimes and modify them. It has the curved slot you need and that is hard to fabricate. It's flat but bends easily in a vice and new holes can be drilled once you grind the chrome off where you want to drill the hole.
This weekend if I cant source a 3G alternator locally I have a old junk 60A 1G alternator off another truck from work I can use as a mock up to see if this bracket lines up properly to try and see what difference there is if there is one. If this one will work and I just need to hammer it out I wont mind, didnt cost me but $30 plus shipping for this NOS bracket.
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