A couple of yrs ago, while at the Waukee swap meet, I purchased a reproduction air stack for a 1940 B from Detweilers. I knew it would be some time before I got around to restoring this B, but I also knew it needed an airstack and this saved me the postage.
The airstack has been on a shelf, patiently awaiting its installation on my B, and yesterday, the time finally came. I carefully ground off the weld holding the bent up original in place, removed the old one, sandblasted the casting clean and made sure it was down to parent metal.
When I went to fit the "new" airstack on the casting, it was immediately apparent that there was absolutely NO WAY it would fit, being nearly 1/8" smaller in diameter than the casting.
I wasn't happy, but realized there was no way I could return it after having it so long. I sucked it up and went about figuring out how to make it fit. I really didn't want to grind away a 1/16" of casting all the way around, as there isn't a great deal of metal there in the first place.
I had considered taking the intake to a muffler shop and having them expand it slightly on the bottom, but the lap seam on the side would have certainly given way, so that wasn't really an option. I slightly beveled the edge of the casting to allow the new intake to "start" into place. I took my rosebud torch and heated the bottom of the stack red hot and using a rubber mallet, began LIGHTLY tapping the stack down on the casting, expanding it to fit. This worked well for the first three hits, but then I noticed that the top of the stack had only been spot welded in two places, on one side, less than 45 degrees apart, and the top was caving in!
I removed the airstack and using a long rod got the top back into place. I then brazed the entire top in place, all the way around it, and smoothed it back off to it looked nice.
Trying again, I successfully expanded the bottom and got the airstack in place. WHEW!
The bottom line is, I was very disappointed in the quality of the item I bought from Detweiers.. (and, as I recall, it was around $60)
Between ill fitting sheet metal, junky battery boxes, crappy plastic faced gauges, one size fits all mufflers and ersatz copies of castings, its becoming really tough to make a decent restoration. I'm fortunate to have a good parts yard nearby, so most of my parts are good used if possible. As an example, I bought a good used, (very little wear) clutch collar, B172 I think it is, for $15. Deere wants THREE HUNDRED AND FIFTEEN dollars for it.
I've been restoring tractors for 26 yrs. and have done a lot of them, but I believe I've been priced out of the hobby.... at least for the green ones.
The airstack has been on a shelf, patiently awaiting its installation on my B, and yesterday, the time finally came. I carefully ground off the weld holding the bent up original in place, removed the old one, sandblasted the casting clean and made sure it was down to parent metal.
When I went to fit the "new" airstack on the casting, it was immediately apparent that there was absolutely NO WAY it would fit, being nearly 1/8" smaller in diameter than the casting.
I wasn't happy, but realized there was no way I could return it after having it so long. I sucked it up and went about figuring out how to make it fit. I really didn't want to grind away a 1/16" of casting all the way around, as there isn't a great deal of metal there in the first place.
I had considered taking the intake to a muffler shop and having them expand it slightly on the bottom, but the lap seam on the side would have certainly given way, so that wasn't really an option. I slightly beveled the edge of the casting to allow the new intake to "start" into place. I took my rosebud torch and heated the bottom of the stack red hot and using a rubber mallet, began LIGHTLY tapping the stack down on the casting, expanding it to fit. This worked well for the first three hits, but then I noticed that the top of the stack had only been spot welded in two places, on one side, less than 45 degrees apart, and the top was caving in!
I removed the airstack and using a long rod got the top back into place. I then brazed the entire top in place, all the way around it, and smoothed it back off to it looked nice.
Trying again, I successfully expanded the bottom and got the airstack in place. WHEW!
The bottom line is, I was very disappointed in the quality of the item I bought from Detweiers.. (and, as I recall, it was around $60)
Between ill fitting sheet metal, junky battery boxes, crappy plastic faced gauges, one size fits all mufflers and ersatz copies of castings, its becoming really tough to make a decent restoration. I'm fortunate to have a good parts yard nearby, so most of my parts are good used if possible. As an example, I bought a good used, (very little wear) clutch collar, B172 I think it is, for $15. Deere wants THREE HUNDRED AND FIFTEEN dollars for it.
I've been restoring tractors for 26 yrs. and have done a lot of them, but I believe I've been priced out of the hobby.... at least for the green ones.