Roundhouse sight glass leaking

[tom_tom_go]

Noticed this today, water dribbles from the bottom of the gauge (the metal surround plate is removed to show the leak):

20180908_132012-01.jpeg (294.89 KiB) Viewed 3004 times

It only leaks when there is pressure in the boiler.

Can I repair it, does it just need descaling?

[tom_tom_go]

Cleaned it last night (the glass panel just pops out) but this morning even with no pressure in the boiler it still leaks.

I have emailed Roundhouse, odd one this.

[Big Jim]

Is there a paper gasket or is it an o ring?

[tom_tom_go]

No seal as far as I can see so I made a gasket from coffee filter paper and seems to have fixed it for now.

I will see what Roundhouse say when they email me back.

[tom_tom_go]

No seal as far as I can see so I made a gasket from coffee filter paper and seems to have fixed it for now.

I will see what Roundhouse say when they email me back.

[IanC]

Interesting to see that no one has offered any advice or a solution. None of my locos have a sight glass so I've not had the problem. My only thought would be to use a smear of silicone sealant. On the full sized locos the gauges often weep a little. However that can sometimes be cured by tightening up by hand, the two securing nuts at the top and bottom of the water tube. It only takes the slightest of adjustment. They are also changed after 21 steamings as a precaution against them breaking in traffic.

[Big Jim]

I am surprised that there is no seal on the gauge. A weep under pressure and then a leak when could would suggest to me a failed gasket .
Not having a loco with a glass like that I can't dismantle one to have a look.
I agree with Ian that a smear of silicone may be belt and braces.

Just out of interest, have you had the glass out or just put the gasket between the two brass mating surfaces?

[tom_tom_go]

The gasket I made is wedged between the steel plate and the sight glass.

Mr Roundhouse is sending me a new seal so when I get it I can work out what and where it is located!