OK, I need a Rayburn expert because I have tried everything I can think of, and I am making no progress, sit back and I'll fill you in!
Rayburn 480K Mk1 with the early Nuway burners and separate oil pump between. This has been a problem boiler but after several in depth rebuilds had started to perform well and had run unattended for about six months. I was called out to it to find the oil pump had quit. on stripping the Danfoss pump, the drive pin was broken and the pump was full of metal. Made new drive pin, cleaned pump out and rebuilt it, and off she went while I went off to order a new Danfoss BFP20 R3.
When it arrived I purged and cleaned the system,fitted the new pump, set pressure to 9Bar, and away it went. Two weeks later it quit again, and back I went. Pump jammed! As it was two days before Christmas, and another pump was not available I stripped the new one to find that it appeared to be failing in exactly the same way as the old one. Pump was jammed with tiny bright metal swarf which is coming from the edges of the drive slot in the pump shaft and the drive pin. This is now an ongoing problem and all my attempts to find a solution have failed. I have run the boiler with pressure gauge attached and fired both burners to see if there is a sudden pressure rise when one cuts out, and there isn't. I have purged the oil line and checked all the filters, and all is clean. Pump motor bearings are fine and when cleaned and firing there is no pump noise. Pump spins freely when motor shaft is spun. Any ideas welcome!
Phil
Rayburn 480K Mk1 with the early Nuway burners and separate oil pump between. This has been a problem boiler but after several in depth rebuilds had started to perform well and had run unattended for about six months. I was called out to it to find the oil pump had quit. on stripping the Danfoss pump, the drive pin was broken and the pump was full of metal. Made new drive pin, cleaned pump out and rebuilt it, and off she went while I went off to order a new Danfoss BFP20 R3.
When it arrived I purged and cleaned the system,fitted the new pump, set pressure to 9Bar, and away it went. Two weeks later it quit again, and back I went. Pump jammed! As it was two days before Christmas, and another pump was not available I stripped the new one to find that it appeared to be failing in exactly the same way as the old one. Pump was jammed with tiny bright metal swarf which is coming from the edges of the drive slot in the pump shaft and the drive pin. This is now an ongoing problem and all my attempts to find a solution have failed. I have run the boiler with pressure gauge attached and fired both burners to see if there is a sudden pressure rise when one cuts out, and there isn't. I have purged the oil line and checked all the filters, and all is clean. Pump motor bearings are fine and when cleaned and firing there is no pump noise. Pump spins freely when motor shaft is spun. Any ideas welcome!
Phil