2n carb rebuild

stryped

Member
I am rebuilding the carb on my 2n. I bought the cheaper kit at TSC. I have taken it apart and cleaned the carb in my small HF ultrasonic cleaner. However, I have flash rust inside and outside of it. Will this pose a problem or should I go ahead and assemble it? If I need to remove it, what is the best way?

My kit does not come with jets or a power needle. Is it ok/advisable to reuse these components?

One last thing, my kit did come with a new throttle and choke seal. Does the brass insert pressed into the carb body have to come out before replacing this seal? Or, does the seal fit on the outside of this brass fitting?

I appreciate your help!
 
"I have flash rust inside and outside of it."

Use a weak acid - white vinegar works for me. I don't care about rust on the outside.

"My kit does not come with jets or a power needle. Is it ok/advisable to reuse these components?"

I never remove the jets. I use old guitar string to make sure the passages are open. Also a rubber tipped air gun.

"my kit did come with a new throttle and choke seal. Does the brass insert pressed into the carb body have to come out before replacing this seal?"

That is a bushing. I don't remove it unless absolutely necessary. Seal goes on the outside. There is probably a little air leak there in all these old carbs.
 
The jets can be reused but I would make sure they are clean.
Needle too if it is straight and in good shape.
If not holler at me. I have a coffee can fuel of used ones.
Shafts, needles, jets etc.

A cub brush in a Dremel tool works well for light rust.

As for the brass piece, if it is a bushing it stays, if it is the little
brass retaining cup (21) then the seal (22/22A) goes under it.

38398.jpg
 
I am assuming 21 is the shaft rubber seal and 22/22a is the pressed in brass fitting?

One other thing, my choke spring on the outside of the choke shaft broke. Is it necessary to have this and could I fab something up from local parts rather than order a new one?

It is funny you mention bent needles. My long power screw has a slight bend in it. Will this hurt anything?
 
(quoted from post at 06:34:44 07/26/16) I am assuming 21 is the shaft rubber seal and 22/22a is the pressed in brass fitting?

One other thing, my choke spring on the outside of the choke shaft broke. Is it necessary to have this and could I fab something up from local parts rather than order a new one?

It is funny you mention bent needles. My long power screw has a slight bend in it. Will this hurt anything?
I like the complete kit, you get everything you could possibly need and then some. Bent needle, maybe ok maybe not. they come with a complete kit along with the spring for the choke.
 
Other way around, brass retaining cup (21) then the seal
(22/22A) goes under it. The retainer holds the seal in.

That's what I hate about the cheap kits. Missing parts.
If you want to email me your mailing address I'll send you a
spring and needle. RoyseTractors at gmail.com
 
Let me know if you are missing any other parts too.
Might as well put them all in one envelope.
 
So the rubber shaft seal goes on the inside side of the carbonator shaft hole? Can it be put in without removing the brass fitting?

Thanks! I appreciate it!!!
 
"So the rubber shaft seal goes on the inside side of the carbonator shaft hole?"

Normally, it is inserted from the outside, into the counter-bore
of the shaft hole, from the outside, then the retainer goes on,
then the shaft goes through them both.

Do you have a picture of what you're calling a "brass fitting"?
If it is a brass bushing that was inserted in the hole, which is
a common repair, you don't want to take that out. You may not
be able to put the seal inside the brass retainer like it originally
was installed.

If it is the brass retainer, you remove that and the old seal
would be behind it. Removing it is how you remove the old seal.
When I get home I'll see if I can get you some pictures of each.
 
The brass piece I am referring to is pressed in I think. I see no way to remove it easily without deforming it.
 
Its probably a bushing then.

Here's a picture of the hole empty.

38472.jpg


This is with the seal in place.

38473.jpg


And then the brass retainer to hold the seal in place.

38474.jpg


Here's a pic of one with a brass bushing poorly installed.
No room for the seal or retainer. With something like this
about all you can do without replacing the bushing is put the
seal up against it and use some washers to hold it up snug.
Too loose it won't seal, too tight and it will bind the linkage.

38475.jpg
 
That is it! So, that brass piece has to
come out before installing the seal?
What is the best way to get it out
without messing it up?
 
If the one in picture #3 is what you have they come in some of
the more expensive kits but not all of them. Kind of a crap shoot.
It's a light press fit so you can take it out by using a round punch
or the old rod if you have a new one, inserted in the center hole
to pry it out. Rock it back and forth slight and try not to bend it.
They can be re-used, as long as they hold your seal in snug.

If the last picture is what you have, don't try to pry it out.
 
I am sorry, I feel brain dead. What is the difference between picture 3 and 4? I keep hearing seal, retainer,and bushing. Is what you are calling a retainer the "end cap" in the second hole in the body of the carb? (I think number 23 on your diagram?)
 
(quoted from post at 07:38:46 07/28/16) I am sorry, I feel brain dead. What is the difference between picture 3 and 4? I keep hearing seal, retainer,and bushing. Is what you are calling a retainer the "end cap" in the second hole in the body of the carb? (I think number 23 on your diagram?)

Picture three is what you should have if it is still original. Picture four shows a brass busing that some has installed to correct for a worn bore.

If you are not sure of what you are trying to do, send the carb to Royse for rebuild.
 
I'm not sure how to make it clear.

This first picture is the seal and retainer, part 22 and 21 respectively.
Picture #3 in my previous post shows these installed where they go.

The second picture is of throttle shaft bushings. The last picture
in my previous post shows the end of one of these bushings installed.

38522.jpg


38523.jpg
 

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