top altinator mounting hole not threaded
 

New remanufactured Delco, no threads in top hole, factory defect? Just use bolt, washer , nut? or return it?

Re: top altinator mounting hole not threaded
 

It is a defect. You should return it if it is not too inconveniant. I have used a bolt & nut & washers many times when the threads were stripped.
George

Re: top altinator mounting hole not threaded
 

Tap it?

Re: top altinator mounting hole not threaded
 

what's the easy way? tap, bolt & nut or return it?

Re: top altinator mounting hole not threaded
 

The easiest is put a nut and bolt in it.
The right way is to return it and require the supplier to provide the correct part.
Tapping it may or may not a work depending on the size of the hole that isn't tapped. If it is too large then the next size up bolt is likely going to be too big for the bracket.
We Hot Rodders are too quick to modify a new part that is incorrect in order to get things done. But the reality is that after 60 plus years manufacturers still don't know how to make a correct alternator bracket for a SBC since no one ever returns them because it doesn't fit. So they keep selling stuff that doesn't fit correctly.
As I am guilty of this too I will now get off my soapbox.

Re: top altinator mounting hole not threaded
 

Where did you find a soap box?....:lol:

Re: top altinator mounting hole not threaded
 

Will return to NAPA, I guess delco doesn't mean usa made anymore? Maybe someday again?

Re: top altinator mounting hole not threaded
 

I would drill it out and use it. Hopefully it would charge right. Then if it didn't I would return it.
I always put a long enough bolt in it anyway to put a lock nut on it. I don't trust the threads.:chevy:

Re: top altinator mounting hole not threaded
 

It may not be a defect. There are some non-automotive applications of the 10SI alternator that use a bolt with a nut or threaded bracket because the alternator is fixed and something else is used to tension the belt. You could thread it, use a nut on the back, or helicoil it.

Re: top altinator mounting hole not threaded
 

Been that way a loooong time! Mexico or China (and lots of other cheap labor locations) is where everything is made these days. I am a die hard buy American guy and it gets more difficult every day. Some manufacturing was coming back but that is about to end!

Re: top altinator mounting hole not threaded
 

Nut,washer, bolt. Done.
Unless you need chalkmark correct.
I much rather the nut and bolt, over the threads in the case And a steel bolt.

Re: top altinator mounting hole not threaded
 

You could Heli-Coil it.

Re: top altinator mounting hole not threaded
 

I'll add my opinion that it may not be defective. The upgraded alt I put in did not have threads. Also, agree with Andy, more secure to use a bolt and a lock nut. Much easier than drilling and tapping. Doesn't look bad either.