Farm Equipment - CONVERTING FROM NEIHOFF TO DELCO

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CONVERTING FROM NEIHOFF TO DELCO

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=51592
Printed Date: 25 Aug 2025 at 2:13pm
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Topic: CONVERTING FROM NEIHOFF TO DELCO

Posted By: SIMPLICITY
Subject: CONVERTING FROM NEIHOFF TO DELCO
Date Posted: 04 Jun 2012 at 10:30pm

HELLO
I AM GOING TO CONVERT FROM A NEIHOFF TO A DELCO, AND SOMEONE SENT ME A MESSAGE THAT FOR THAT TO WORK I WILL NEED TO CHANGE THE PULLEY DIA.
MY LOCAL ALT. REPAIR SHOP KINDA PULLED A FAST ONE ON ME, I TOLD HIM THAT I WANTED AN EST. FOR THE REPAIR CUZ I KNEW THAT NEIHOFF'S ARE EXPENSIVE TO REPAIR. WELL I DIDN'T GET A CALL TILL IT WAS READY, AND OMG $597.00 I THOUGHT I WOULD LOOSE IT. I TOLD HIM HE COULD KEEP IT, HE NEVER CALLED ME WITH A EST. SO DELCO HERE I COME. IF ANY BODY CAN HELP ME FIND A PULLEY IT WOULD BE DEEPLY APPRECIATED
I AM NOT SURE BUT I THINK THE PULLEY NEEDS TO BE .650 ID AND 3 7/8 OD. THANKS THAD 337-937-6781

Replies:

Posted By: Coke-in-MN
Date Posted: 04 Jun 2012 at 10:35pm

Most of the Delco will take a pulley off a generator as a direct fit. Check on size used on some heavy C series trucks as they used a smaller cast iron pulley.

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Life lesson: If you’re being chased by a lion, you’re on a horse, to the left of you is a giraffe and on the right is a unicorn, what do you do? You stop drinking and get off the carousel.

Posted By: Steve in NJ
Date Posted: 05 Jun 2012 at 6:39am

Most Delco's use a .670 shaft. Been using that shaft for years. That's why I tell our customer's when doing a 6-12V conversion, to use the pulley off their Gennie and install onto their Alternator. Niehoff is an excellent unit, but will give you heart failure with the cost of repair parts alone. Depending on the application and amperage, some Bosch "AL" series Alternators are a nice replacement. Actually, they're a little tougher than the 21 or 22 SI series Delco's. I probably could help you out with a pulley if you knew what the Niehoff model # was that you had. We have bins full of pulleys. Obviously, someone wasn't listening when you said you wanted a quote.... Sheesh!

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