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Replaced the boiler on my Classic... Sounds like i've got a leak but no sign of water


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Replaced the boiler on my Classic last night, fitted new boiler seal and re-fitted the steam valve. It's working all OK however it sounds like there's a leak coming from the top of the boiler - I can't see any water, could it be that the steam valve isn't sealed properly and some steam is escaping under pressure?

 

Any help or advice is always appreciated!

Edited by MartinB
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Have you had a look at the top of the boiler whilst it's pressurised? Also when you replaced the gasket did you give the leading edges a wire brushing so they were clean? If there was a little debri/dry scale you may find that you do indeed have a small leak. Did you also replace the O ring where the steam valve bolts into the boiler?

 

Lee

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I gave the both edges a good going over with a scourer which i've done before and all seemed fine. I didn't replace the steam valve O ring as it looked in very good condition.

 

I'll have another look when I go home tonight, and probably put it together again!

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Ah, but you removed it to look and put the old one back? Quite often when you break the seal and try to make it again with an old O ring that it won't seal properly. THis is because it will be a little harder and tkes on the shape of both contacted surfaces. (similar to break pads on a disk) WHen you remove it you disturb this alignment the o ring won't seat properly.

 

Lee

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I hope that's sorted it. The machine is a mish mash of parts!

 

Started as a 1995 Gaggia 'Coffee' with the same chassis as the Classic so I popped the internals in from an eBay special Classic with a corroded boiler. The new boiler I fitted last night is from 2010 Baby which is in good condition and exactly the same as the Classic boiler (pretty sure anyway) so once I've fitted the new boiler I will have a pukka machine! Took a few pics last night so i'll upload once it's 100%

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Fitted the new seal last night an it's a hell of a lot better than it was but whilst heating up it's still making a slight hissing sound. I'm not too bothered myself as once the boiler has reached desired temperature whether it be for steam or water it's fine and doesn't make a sound. Also, with the lid on I can't hear a thing so it may have always been like this and I wouldn't have known until I stripped it down and rebuilt it.

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