Alternator

[CRBASIN]

My charging system is not working, and rather than diagnose, I decided to install an internally regulated unit. I went with the Hitachi for the Datsun 720. The new alternator is an almost perfect fit on the stock brackets.

Unfortunately, the unit seems to be shifted forward by a small amount relative to the water pump and crankshaft pulleys. Is there a standard solution? Do I need to grind off a bit of the bracket or alternator? Also, any suggestions on belt size?

As an aside, I very much appreciate your helpful responses to my questions. My Sunbeam is getting closer to roadworthy condition, albeit slowly.

John

 

[Thor 1211]

yea, grind the bracket.

 

[Hillman]

Make it fit. If you don't, no one else will.

 

[Tom H]

Strange. In my case I had to move it forward. In most cases others tell me theirs fit exactly right. I suggest elongating the holes that mount the bracket to the car.

Tom

 

[CRBASIN]

Thanks for all of the suggestions. We elongated the holes, and the new alternator is working perfectly--14.2v. For anyone else doing this, we used a 37.5 vbelt (15375 at Autozone).

 

[rixter]

Hi,

I can imagine that belt size is a matter of a few factors (alternator variation, adjustment bracket), and may be a "see what fits" thing that won't be the same for everyone. At Tom pointed out, some alternators seem to work with the standard bracket and others have to vary it forward or backward to get the proper belt alignment. Sunbeam Specialties has the Gates 7390 (39-5/8 length) as standard. I found a Drive Rite belt, number 15380DR to work for me, which is a bit shorter. Your 37.5 seems to be yet shorter. Here is what I did to make my mount work. I had to elongate to effectively move the bracket and alternator backward.
Rick

 

[johnd]

I too used a 37.5" belt. Number 15375 from VBeltsupply.com - cost $4.82

 

[jumpinjan]

Grinding & elongate the holes isn't necessary (or desired). The MGB Alternator is a great fit. I wrote an article about it in one of the newsletters. I have been using them for 16 years now, and no worries.
Jan