Posted by So. Cal. Plumber on October 20, 2003 at 22:32:07:
In Reply to: Re: slow toilet leak posted by Gary Swart on October 20, 2003 at 16:21:04:
: If you're lucky, it could be the gasket under the bolt head is worn out. That's the first thing to try because it's fairly easy and cheap to do. The other possibility is that there is a hairline crack. These are very hard to see, but will leak as you describe.
You can find some hairline cracks by running your finger over the black washer inside the tank. It will come off on your finger as a black mark. Then run the black mark around each bolt inside. A hairline crack will show up as a black line.