Re: Rear Axle Yoke Cap Finish
Ken------
GM had at least 2 nodular/malleable/ductile iron foundries as far back as the 50's and maybe earlier. At least one was located in Saginaw, MI and was not co-located with the gray iron foundry. I believe that there was also another foundry in Saginaw which poured nodular, ductile, or malleable iron but I don't know much about it. It ceased production a long time ago. The other nodular, ductile, malleable foundry in Saginaw just ceased operations a few years ago.
GM also had a nodular, ductile, malleable iron foundry in Tilton, IL (near Danville). This foundry operated since the 50's and might even go back to the WW II period. It ceased operating about 10-12 years ago. Many Delco-Moraine brake parts were cast here as well as many other GM components.
The rear spindle supports are an example of a nodular iron part that was produced in-house by GM foundries from 1963 right through at least 1974 and I believe through 1982.
Nodular, ductile or malleable iron is much stronger than gray iron.
Also, if you look at most Corvette master cylinders from the 60's through at least about 1973 you will note a "D" casting mark and a "wagon wheel". This denotes a casting poured at Tilton (Danville, IL)
I just recollected that GM has another nodular iron foundry in Defiance, OH. It is co-located with the gray iron foundry but is a totally separate foundry. Most, if not all, GM cast iron crankshafts are poured here and, as far as I know, always have been. By the way, the Defiance, OH gray iron and nodular iron foundries are the only cast iron foundries GM has left and I understand that the gray iron foundry is being partially or wholly converted to aluminum.
Ken------
GM had at least 2 nodular/malleable/ductile iron foundries as far back as the 50's and maybe earlier. At least one was located in Saginaw, MI and was not co-located with the gray iron foundry. I believe that there was also another foundry in Saginaw which poured nodular, ductile, or malleable iron but I don't know much about it. It ceased production a long time ago. The other nodular, ductile, malleable foundry in Saginaw just ceased operations a few years ago.
GM also had a nodular, ductile, malleable iron foundry in Tilton, IL (near Danville). This foundry operated since the 50's and might even go back to the WW II period. It ceased operating about 10-12 years ago. Many Delco-Moraine brake parts were cast here as well as many other GM components.
The rear spindle supports are an example of a nodular iron part that was produced in-house by GM foundries from 1963 right through at least 1974 and I believe through 1982.
Nodular, ductile or malleable iron is much stronger than gray iron.
Also, if you look at most Corvette master cylinders from the 60's through at least about 1973 you will note a "D" casting mark and a "wagon wheel". This denotes a casting poured at Tilton (Danville, IL)
I just recollected that GM has another nodular iron foundry in Defiance, OH. It is co-located with the gray iron foundry but is a totally separate foundry. Most, if not all, GM cast iron crankshafts are poured here and, as far as I know, always have been. By the way, the Defiance, OH gray iron and nodular iron foundries are the only cast iron foundries GM has left and I understand that the gray iron foundry is being partially or wholly converted to aluminum.
Comment