Cast iron help?

[cruisermatt]

Does anyone know anything about the metallurgy of Land Cruiser F series bellhousings? Specifically, a late-60's early 70's 1F three speed? Are they cast iron? If so, are they a specific kind? And can I weld mild steel to it? Looking into making an adapter bellhousing.

Thanks

 

[cruisermatt]

Anyone?

 

[Billyfj7312ht]

G,day cruisermatt,
I am not sure about the make up of the F series bellhousing, but I used the information in this link to repair a cast iron bellhousng on a Holden and also tacked a bracket to it. The repaired crack never failed whilst I had it, (8 years) but the mild steel bracket only held on for a short while.
Welding Cast Iron | Lincoln Electric

 

[Pin_Head]

They are cast iron; probably nodular, malleable or "grey". Welding on them is problematic because the normal welding / cooling makes the metal under the weld bead brittle due to the precipitation of carbides or Martensite. If you need the mild steel attachment to have any tensile strength, then it is best to install a grid of screws through the cast iron in the shape of the weldment to provide mechanical strength. Then weld over these with nickel rod or filler which will not form carbides and then weld the mild steel bracket on to this normally.

 

[Billyfj7312ht]

Yeh.....that's what I meant, but I was having trouble spelling Martensite......always gets me

 

[firestopper]

Not real clear on the size of bracket you want to attach to the bell housing, but if the brackets mounting surface is the same contour of the surface to be mounted, you might drill and tap the cast to mount the bracket. A fine thread pitch and thread lock might work. Brazing is another option but you need to be experienced.

 

[cruisermatt]

After talking to some pro-welders this plan is out the window.

Just for closure what I wanted to do was mill of the mating surface of the transmission-to-bellhousing, cut a 1/2" sheet of cast iron with the mounting pattern of an NV4500 and weld it on.

This is impossible for two reasons:

1. Obtaining a 1/2" sheet of cast iron
2. Welding it

 

[rusty_tlc]

NV4500 Retrofit Adapter Packages | Advance Adapters


Just sayin.......

 

[cruisermatt]

Good luck finding one meant to adapt an F-Series motor to an early NV4500 - is been discontinued for years.

 

[rusty_tlc]

DOH!