'45 BN...carb float sticking?

Farmall B & BN Tractors, 1939-1947

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wjwolfe82
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Joined: Tue Apr 13, 2021 3:33 pm
Zip Code: 43050

'45 BN...carb float sticking?

Postby wjwolfe82 » Wed May 19, 2021 3:37 pm

After rebuilding w/carb kit, it leaks out the drain hole at the bottom of the carb and then starts weeping out. Is my float stuck?
I've had it apart a couple times, even putting the old main jet back in just for fun but it still starts leaking eventually. I can hear the float moving if I give it a gentle shake after re-assembling it.
It starts ok (takes a couple easy cranks) and once warmed up she will idle as smooth as Mom's sewing machine.
FYI, this is my first carb rebuild.
Appreciate any insight.
BNCarb.jpg
central Ohio

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arlen
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Re: '45 BN...carb float sticking?

Postby arlen » Thu May 20, 2021 10:37 am

When you rebuilt the carb, did you replace the needle and seat? There is also a pin that the float hinges on. Did you replace that?
Is it just leaking at the drain plug? Not familiar with the zenith carb at all...mine has a marvel schebler

wjwolfe82
Posts: 22
Joined: Tue Apr 13, 2021 3:33 pm
Zip Code: 43050

Re: '45 BN...carb float sticking?

Postby wjwolfe82 » Fri May 21, 2021 10:24 am

arlen wrote:When you rebuilt the carb, did you replace the needle and seat? There is also a pin that the float hinges on. Did you replace that?
Is it just leaking at the drain plug? Not familiar with the zenith carb at all...mine has a marvel schebler



Yes, I believe so. I replaced everything that came in the kit. It drips out the drain hole then appears to weep out the gasket and choke rod.
I've searched for all the youtube videos I could find about it & plan to work on it this weekend...maybe the float isn't level properly or has a hole.
Thanks.
central Ohio

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Don McCombs
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Tractors Owned: "1950 Something" Farmall Cub
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1948 Farmall Super A
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Location: MD, Deep Creek Lake

Re: '45 BN...carb float sticking?

Postby Don McCombs » Fri May 21, 2021 11:18 am

Did the kit come with instructions for setting the float?
Don McCombs
MD, Deep Creek Lake

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wjwolfe82
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Joined: Tue Apr 13, 2021 3:33 pm
Zip Code: 43050

Re: '45 BN...carb float sticking?

Postby wjwolfe82 » Fri May 21, 2021 11:51 am

Don McCombs wrote:Did the kit come with instructions for setting the float?


No, don't recall seeing any instructions for that.
As I understand it (now) is that I need to make sure it is at least level (?)
central Ohio

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Don McCombs
Team Cub Mentor
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Posts: 15563
Joined: Mon Feb 03, 2003 6:45 am
Zip Code: 21550
Tractors Owned: "1950 Something" Farmall Cub
1957 Farmall Cub w/FH
1977 International Cub w/FH
1978 International Cub
1948 Farmall Super A
Circle of Safety: Y
Location: MD, Deep Creek Lake

Re: '45 BN...carb float sticking?

Postby Don McCombs » Fri May 21, 2021 3:37 pm

You need to determine the correct settings and make the proper adjustment. Perhaps someone on here knows what they are.
Don McCombs
MD, Deep Creek Lake

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Proud Member of Maryland Chapter 39
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arlen
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Re: '45 BN...carb float sticking?

Postby arlen » Fri May 21, 2021 7:09 pm

wjwolfe82 wrote:
Don McCombs wrote:Did the kit come with instructions for setting the float?


No, don't recall seeing any instructions for that.
As I understand it (now) is that I need to make sure it is at least level (?)

Your in luck! The pdf service manual available fo free download on this forum has the procedure. I just checked.

wjwolfe82
Posts: 22
Joined: Tue Apr 13, 2021 3:33 pm
Zip Code: 43050

Re: '45 BN...carb float sticking?

Postby wjwolfe82 » Mon May 24, 2021 2:26 pm

arlen wrote:
wjwolfe82 wrote:
Don McCombs wrote:Did the kit come with instructions for setting the float?


No, don't recall seeing any instructions for that.
As I understand it (now) is that I need to make sure it is at least level (?)

Your in luck! The pdf service manual available fo free download on this forum has the procedure. I just checked.



Excellent. I found it. Thanks.
Unfortunately didn't get a chance to look at this last weekend. Spent all my time rigging up a hillbilly solar heater contraption for the pool.
central Ohio

wjwolfe82
Posts: 22
Joined: Tue Apr 13, 2021 3:33 pm
Zip Code: 43050

Re: '45 BN...carb float sticking?

Postby wjwolfe82 » Tue Jun 15, 2021 12:13 pm

I've had it apart a few times. No luck. For now I'll just shut the gas off at the bowl. She will still fire right up on the first crank.
Maybe I'll try the more complete rebuild kit sometime in the near future. Too much grass to cut for now.
central Ohio

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Don McCombs
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Posts: 15563
Joined: Mon Feb 03, 2003 6:45 am
Zip Code: 21550
Tractors Owned: "1950 Something" Farmall Cub
1957 Farmall Cub w/FH
1977 International Cub w/FH
1978 International Cub
1948 Farmall Super A
Circle of Safety: Y
Location: MD, Deep Creek Lake

Re: '45 BN...carb float sticking?

Postby Don McCombs » Tue Jun 15, 2021 3:50 pm

What all did you do to it while it was apart?
Don McCombs
MD, Deep Creek Lake

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Proud Member of Maryland Chapter 39
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