leaking bypass valve adjusting screw

valcra · 17 Mar 2015

worcester 240 rsf

can the bypass adjusting screw be removed and repaired to prevent leak?

Is there some kind of seal on it that can be renewed?

Thanks in advance of reply.

valcra.

Agile · 17 Mar 2015

You probably would need to buy a new assembly.

Probably 87161423260 at about £60 !

Tony

valcra · 18 Mar 2015

Agile said:
You probably would need to buy a new assembly.

Probably 87161423260 at about £60 !

Tony

Hi Tony,

thats a pressure guage for the 240 rsf.

think i need an o ring for the adjuster screw!

do i have to drain combi before removing adjuster?

valcra.

Agile · 18 Mar 2015

Sorry, don't know where that number came from.

Try 87161205080 for the bypass assembly then.

You have to drain the heating side to do anything to the bypass.

I don't expect you will find a seal listed separately.

If it did come apart you would probably have to match up the size of seal with a generic one.

Most engineers would just replace the whole assembly!

Tony

buck51 · 18 Mar 2015

Most people who repair boilers for a living these days are not engineers by a long mile, they are parts changers.

Like sound engineers would change microphones or leads for new

a Television engineer would repair circuit boards to component level

buck51 · 18 Mar 2015

Have a read of this post last comment
//www.diynot.com/forums/viewtopic.php?p=25528

valcra · 18 Mar 2015

thanks lads,

i'll try the o ring route then.

Agile · 18 Mar 2015

The old post is interesting but be aware that it was over 10 years ago.

Whilst Worcester are better than many others with older spare parts they usually discontinue smaller parts where a larger assembly is still available. So the screw alone may not be available.

In theory Worcester Spares department should be able to help but mostly I have never been impressed by manufacturers spares people who usually will do no more than ask for a part number!

The usual way to find parts is to go to Parts Centre and they bring up an exploded diagram and you point to the part required and they see if it has a part number and is still available.

I would try to replace just the "O" ring seal as I have generic selections available to choose what may fit.

Tony

Gasguru · 18 Mar 2015

Part No. 87161408080 is just the O ring 2.40mm x 7.60mm inside dia.

or Part No. 87161402540 is the bypass screw, O ring and circlip.

valcra · 18 Mar 2015

managed to get 'o' ring at plumb centre branch after looking at their schematic database.

they only had the one!!!

once you have the part number and search it, they are also available online at numerous heating suppliers.

so i will remove and replace the 'o' ring when I get the chance.

thanks lads.

valcra · 18 Mar 2015

once adjusted, is this bypass valve open continually (passing) whatever is demanded ch or dhw? (just a bore between flow and return which is restricted with the bypass screw)

or

is there an internal mechanism which opens and closes the valve as and when required?

how does it work!!!

Agile · 18 Mar 2015

It is always present between flow and return.

But there is no flow pressure during DHW as the flow is diverted to produce the hot water!

Tony

valcra · 19 Mar 2015

Agile";p="3345554 said:
It is always present between flow and return.

But there is no flow pressure during DHW as the flow is diverted to produce the hot water!

Tony[/q
Hi Tony,

Thanks for the bypass explanation

Fitted new 'o' ring to bypass screw and valve. "leak cured"

Thanks to all who contributed in this thread.

valcra.

diynot

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

leaking bypass valve adjusting screw

Similar threads