Scovill #12 back supply ballcock, Help with old toilet that won't stop running

[Sogdean]

I'd love to just replace the inside assembly, but it's a strange (old!) set up...definitely not a modern set up.
I've adjusted the floating ballcock to no affect. The water continues to run in to fill up the tank and never stops.
I had assumed the water shutoff valve was at the left (there is no input below the toilet from the wall like modern setups),
but it doesn't seem to do anything to stop the flow. The flapper seems to be sitting fine.
Toilet still flushes and works ok, just the constant running is loud and a tremendous waste of water.

I'd like to understand how the fill valve works on this. I think there's something there where it doesn't register...hey there's enough
water in the tank now...we can stop filling up...

Any help or insights would be appreciated. Cheers!

 

[PlumbNuts]

I would love to help you but even after 35 years in the business I have never seen one of those.
I am sure someone will be along shortly who has.
I am going to follow this thread so that I can learn something new....

 

[Sponsor]

 

[Tuttles Revenge]

I've ripped them out only.

I just went thru my Wolverine Brass catalog and couldn't find parts for that style.

There must be a float on the rod on the right side of the tank.. That's the part that senses the water level. It transmits that energy through to a rod that opens to let water in when the float is lowered and closes when its lifted and the tank is full. Its the same as other old brass style valves, just upside down.

OK.. So I just happened to have a similar style Ballcock sitting next to my desk.. Took it apart and there's a flat rubber washer that pushes against a seat.. in your case its likely a brass seat. Totally repairable if you can get the seat out if its worn.

Wall hung tank..

 

[PlumbNuts]

The rod that is sticking out to the right hand side that Tuttle referred to; If you pick up on it with slight pressure does that stop the water?

 

[Sogdean]

Sorry I didn't take a wider pic...yes, there is indeed a float ball at the other end. Lifting it does not stop the water from running.
That's how I it should work, right?...the float gets to a certain height and cuts off the water flow coming in.

Thanks for the pics Tuttle! It could definitely be worn from age.

edit:
I've emptied the tank as best I could and manually lifted the floater a bit. The incoming water flow does noticably lessen but does not stop completely.

 

[Tuttles Revenge]

Yep, the two parts that form the seal have worn out. One part or both.

I'm guessing its an old wall mounted style tank with a 2" chrome ell that connects the tank to the bowl. I know I've worked on those, but I think they were converted to a normal ballcock.. So perhaps someone got brave and very carefully drilled a hole through the porcelain with a diamond or carbide hole saw.

 

[Sogdean]

Thanks for the responses, Tuttle! Unfortunately, as I expected, it's super rusty and old...The thumbscrews broke off instead of unscrewing properly. Ugh.

 

[Marlinman]

This is a older Scovill #12 back supply ballcock. The compound lever lifts the plunger as the float rises. These are still available online and parts houses.

https://www.cescobrass.com/model12.cfm