Carburator Inlet Question

[xraycajun]

I picked up a new steel fuel line to replace the rotten rubber one that had been on the tractor. I was disappointed to find that the new correct fitting will not go into the threads of the carb top. I guess the thread was re-cut many years ago. Here is a picture of the fitting that was in there... and the new fitting. Is there a way to adapt the correct fitting into the carb top now, or am I stuck with the rubber fuel line?

[Barnyard]

You can helicoil the inlet.

[Urbish]

You'll have to figure out whether the new threads were cut for NPT, Compression, or straight SAE threads. Check out this post: http://farmallcub.com/phpBB2/viewtopic.php?f=1&t=96706&p=761699

[John *.?-!.* cub owner]

Does the "correct" fitting slip into the hole? If so, it is probably too far oversized for a Helicoil, in which case I do not have a good suggestion. If it is just a matter of threads, then installing a Helicoil is a good possibility. The original is 1/2 inch bolt threads as I recall. If I am wrong I believe someone will correct me. Have you tried taking your original fitting and/or carburetor to a real auto parts store, such as NAPA, Carquest, or in many areas O'reillys? hey may be able to help with an adapter.

[Frozenstate]

Would a reducing fitting work?

[ScottyD'sdad]

Does the "correct" fitting slip into the hole? If so, it is probably too far oversized for a Helicoil, in which case I do not have a good suggestion. If it is just a matter of threads, then installing a Helicoil is a good possibility. The original is 1/2 inch bolt threads as I recall. If I am wrong I believe someone will correct me. Have you tried taking your original fitting and/or carburetor to a real auto parts store, such as NAPA, Carquest, or in many areas O'reillys? hey may be able to help with an adapter.

That's 1/2 inch NF bolt thread. (Fine thread), John.

Ed

[Ken (48 Cub)]

Mine was the same way. That barbed fitting for rubber hose has over sized the carb inlet. It can be helicoiled...Rick Prentice did mine.

[xraycajun]

The correct fitting fits in... with lots of play. I think the inlet was drilled and re-threaded when the original fuel line was replaced. I will look for an adapter.... but hoping you guys had other suggestions as well.

[xraycajun]

OK... so I read the post about all the fittings and such.. That's far out of my area of understanding. Does anyone have a pictoral guide outlining the procedure to adapt the fittings? I will see if I can determine the thread size inside the inlet...

[Barnyard]

Yours is probably 1/8” pipe thread. Many po’s would force that fitting into the inlet causing the inlet threads to strip.

[Don McCombs]

If time is not critical, I know you could get it resolved at Buddy's cubfest in late March.

[Glen]

Hi,
I'm not sure if your carburetor in the pic is fastened onto the manifold in the normal position, but the choke rod is not in the right position. It shouldn't be rubbing on the Touch Control tubes, the engine vibration can wear the rod into the tubes over time.
The rod should be above the tubes. Below is a pic showing how it should be.

The lever on the carb usually has to point straight down, when the choke valve is fully open.
Below is a pic from TM tractor showing that. You can change the position of the lever on the shaft, if needed.

The rod may need bending to make it the right shape. If it does not go above the tubes, it may need more bend where the bend is in the pic.
There is another bend in the rod about 3 or 4" in from the dash, so the loop on the end of the rod is level with the ground.

[xraycajun]

Good catch on the choke rod.... Its always been that way as long as I remember. I'll have a look at that too...