For the 33si on an NHC250Hello,
New to the site, this being my first post. I am running into the same problems as everyone else on this thread with the generator not charging the batteries properly. I have decided to convert to the 21SI alternator and by reading through this thread I have determined I will need a new 7/8" shaft V belt pulley to go in this new alternator. I see there is a new bottom bracket that comes from Cummins that bolts on the bottom for the 6 CTA 8.3 engines. However, I have an NHC-250 engine. Does this still require the bottom bracket or will the new alternator bolt right on? After reading the thread I am still confused about this.
M939 NHC250 Delco Remy 33si Alternator Upgrade
Before I get started I must give credit where it's due. Throughout this process, 74M35A2 has been an infinite source of knowledge on the specifics and details of this alternator. He stayed with me from the purchase, to when I fired it up after I was done. Without him, I'd still be using trial...
For a 24si alternator on an NHC250
Delco 24si alternator install on nhc250
Got a 24si alternator from 74m35a2 and here is how the installation went. On first mock up it was clear the pulley was going to sit to far forward. To combat this the bracket was removed and machined to make it adjustable next since the 2 tabs for mounting on the bottom of the alternator were...
I have the new delco 100amp 33si alternators for sale if interested