Leaky float bowl seat

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DogT

DogT

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As I suspected, the left float bowl needle valve is not sealing closed. I made up a rig to test them, and the RH is fine, and the seat is sharp, with no taper to it. New Viton tipped needle valves. The LH seat looks like someone has taken a drill to it, there is a taper on the seat and I cannot get the needle valve so seat enough to stop dripping. Any suggestions? I see AntriMan used some diamond polish on a q-tip to polish the seat. Should I try that? Where do I get diamond polish compound?

Leaky float bowl seat


Leaky float bowl seat


Dave
69S
 
You can make a pretty good lapping rod out of wooden dowel, if you make a point on it (pencil sharpener) and use some very fine lapping compound you can bring that seat back quickly by driving the dowel at low speed with a variable speed drill; do be aware of the heat you generate as it may permit the seat to loosen and move downward. If you would prefer to make it easy on yourself I have a spare bowel that could be in better shape that I will send you, just PM me with the shipping address and I'll send it to you.

RS
 
Thanks, RS. I'll try the dowel first. I have Simonize polishing compound, J-B Compound, Mothers AL polish and Scratch Out. Is your bowl without the drain at the bottom? I'm trying to keep a pretty original look to it, but if I don't have any luck with the dowel, I'll be in contact.

Dave
69S
 
DogT said:
Is your bowl without the drain at the bottom? I'm trying to keep a pretty original look to it
Click to expand...


You could replace the bad needle seat with a good one? Warm the bowl and knock the old one out with a 1/8" parallel pin punch.
 
Thanks, L.A.B., but where do I get a new seat? That was the first thing I thought of, but Amal doesn't offer them, neither does Old Britts as far as I can tell. I haven't done a thorough search though, information on where would help if you have a source. I haven't even come up with a part number yet. I'm definitely going to try the sharpened dowel as the first line of defense.

Dave
69S
 
Dave I was just using what I had close at hand.
The diamond paste is used to polish the hardened steel of production quality plastic injection moulds.
McMaster and MSC have it in small syringe packaging.
Probably any rubbing compound will work equally well on the soft brass seat.
A decent pair of eye loupes are handy too for the old feeble eyes like mine.
How badly damaged is it? Can it be taken out, reversed and reinserted?
Is some sealer needed upon insertion? Removal is something I haven't needed to attempt so far.
 
DogT said:
but where do I get a new seat?
Click to expand...

You'd need a "donor" float bowl. What I meant was that you could remove a good seat from another bowl and transfer it to your bowl.
 
reinserting the seat in reverse was a stupid suggestion I made.
It is essentially a tube with a stepped inner diameter.
The needle pilots in the larger id and seals against the smaller feature.
There, I'm self admonished.
If you can't find a used bowl to your liking, maybe with the part number you can find one at Burlen.
A quick look at spares category doesn't show a drainless bowl but I know for a fact this is not the entire listing.
I have found the correct bowls for my 932's with .125" seating 622/056 using the search function and they are not shown in spares that I could find either.
Good luck whatever direction you take.
 
I didn't want to say anything about reversing the seat. I knew you would figure it out. But, success. I tried several tools to polish it, but they didn't seem to be doing anything, so I went in search of something I could make and I found a piece of 3/32" aluminum rod. Whacked off about 2" and filed the end of it by eye in a drill to the angle of the needle as close as I could see. Put some J-B compound on it and ran it in the seat for about 30 seconds and VOILÀ, no more drips. Now if I could get my genuine taps to seat. I may have to go to the BAP ones.

Leaky float bowl seat


Thanks for all the ideas, they helped. Upon close inspection, it really looks like someone put a drill into it. At least it looks smooth now.

Dave
69S
 
Just to really confuse everyone, my parts book lists 622/050, the Old Britts site for 71 lists 622/055 (with drain) and 622/50 without drain, not available and the Amal site 622/55 bowl looks totally different. I'm assuming the seating dimension given refers to the diameter of the seat hole?

Doesn't matter to me since I have it working.

Dave
69S
 
DogT said:
Just to really confuse everyone, my parts book lists 622/050, the Old Britts site for 71 lists 622/055 (with drain) and 622/50 without drain, not available and the Amal site 622/55 bowl looks totally different.
Click to expand...



The original 622/050 float bowl (without drain plug-which I believe is no longer available?) has the 0.10" seating.

The 622/055 is the drain plug float bowl with 0.10" seating.



DogT said:
I'm assuming the seating dimension given refers to the diameter of the seat hole?
Click to expand...

Yes.
 
Glad you got it working!

FWIW - If I was faced with this situation and the old seat could not be cleaned up, I'd just turn (have someone turn) a new seat out of some brass stock. It wouldn't take 10 minutes to make it on something like a clockmaker's lathe. I'd personally do that as opposed to buying another fuel bowl just to use the seat.
 
Mike,
I was thinking about having one of my friends turn me a new one if I couldn't get it working. I have a local machine shop, but they charge two arms and a your first born for any little thing.

LAB, yes, my bowls have the 0.10 seats.

Dave
69S
 
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