[Farmall] 1949 H Exhaust Pipe

[Mike Sloane]

Harbor Freight sell inexpensive pipe thread sets. I wouldn't use them 
professionally, but I am sure they would be adequate for chasing threads 
in cast iron. Generally, the old timers would use kerosene for a 
lubricant when threading cast iron. Also, with cast iron, you turn a 
little and then back off, clearing the chips/crud as you go. So go 
slowly. If you know an old time plumber, he *might* be willing to lend 
you his tap, but I wouldn't count on it. (I don't think I would, but I 
might offer to do the job for little or nothing.) Finding a piece of 
black iron pipe the right size and already threaded on one end might be 
a challenge, depending on where you live. I have gotten replacements 
from Case IH when all else failed.

Before you start, stuff a rag or wad of paper down into the hole to keep 
the chips/crud from the rest of the manifold. After you are done, and 
the kerosene evaporates, remove the blockage and go in with the skinny 
nozzle on the vacuum cleaner hose and suck all the chips that might have 
fallen down. It isn't likely that any crap will get into the valves or 
combustion chambers, but you should avoid the possibility.

Mike

On 6/6/2012 6:35 PM, farmallgray at aol.com wrote:
>
> Chasing is similar to tapping. Chasing is not supposed to remove any metal. You will probably have a hard time finding a chaser for 2" pipe thread anyway. If the threads are that bad they will probably
> need cut a little deeper anyway so a tap will do just fine. Hopefully you know someone you can borrow one from.
>