Crane old boiler hammering or knocking inside
Posted by Jason on March 04, 2003 at 17:50:30:
The boiler is a Crane sunnyside 102A from 1974 or 1975. I moved into this house about 4 years ago and the boiler has worked fine. I've done little to it except put a new motor on it and had the main burners cleaned. I don't know much about this so please excuse the poor terminology. I don't have zones, once the thermostat kicks in all pipes get hot. The problem i'm having is when the thermostat kicks in and tells the boiler to go, it does but it after about 5 minutes it makes fairly loud knocking or hammering sounds from what sounds like the inside of the boiler. It wakes us up at night. This noise will last for about 5-10 minutes and slowly go away the hotter the boiler gets. What is causing this and what can i do about it? I'm fairly handy so i'm not afraid to open her up. I tried cleaning the main burners as there was a lot of soot build up, this seemed to help some but the noise came back again. Please help

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