EFM 520 Major leaks

EFM 520 Major leaks

PostBy: mufwapo On: Mon Oct 06, 2008 9:58 am

I filled up my EFM 520 for the first time since getting it into position and I found some of the tubes in the back leak. I'm not sure what they're called but they're the tubes that the flue gasses travel down through to exit out the flue pipe. Just by removing the rear plate and sticking my head in there it looks like there have been some holes rusting in there from sitting. From the looks of it I have to take the boiler off the stand and cut out the plate the tubes are welded into from the top and bottom and replace that section. Is there an easy way to do this or has anyone done this before? The metal tubes look pretty thin so I'm assuming this happened on a number of these furnaces.
mufwapo
 
Stove/Furnace Make: EFM
Stove/Furnace Model: Boiler

Re: EFM 520 Major leaks

PostBy: stoker-man On: Mon Oct 06, 2008 11:19 am

Maybe you can contact forum member scrapper_23jr for welding or advice.

Used boilers are always a cat in the bag.
stoker-man
 
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove

Re: EFM 520 Major leaks

PostBy: e.alleg On: Tue Oct 07, 2008 9:06 pm

sometimes it's worth the extra money to buy a nicer used unit up front than try to fix one that is too far gone. The downside is that the boiler you want to buy will still be in operation so that means more work unhooking and extracting it. Units that are left in a scrap pile outside for years aren't that good.
e.alleg
 
Stove/Furnace Make: EFM
Stove/Furnace Model: 520

Re: EFM 520 Major leaks

PostBy: mufwapo On: Wed Oct 08, 2008 8:49 am

That's what I assumed about this one. It was still hooked up in the basement of an empty house. After I had removed it though I found out that the house had been empty for about 15 years. From what I understand these tube style boilers are more prone to rusting like this especially if hooked up to a chimney and not running. Other than the tubes though everything appears to be in tip top shape. I'm going to cut out the affected section and post some pictures on here shortly. Still not sure what the best route to take on this one is though.
mufwapo
 
Stove/Furnace Make: EFM
Stove/Furnace Model: Boiler

Re: EFM 520 Major leaks

PostBy: mufwapo On: Mon Oct 13, 2008 1:02 pm

I've cut out the rusted tubes and replaced them. Then re-welded together everything I had to cut out to replace them. I now have a new question. After all of this was done and I filled up the unit to test it I have some seeping around some of the pipes that drips down the tubes. I was going to try some type of boiler sealer. I have no problem filling this up and getting it up to temperature but I'd like to seal this up leak free before I hook everything back up. Do the liquid boiler sealers work? If so would I be better off using more than recommended. Some say the more you use the better they work. Also some of the warning labels say not to use with water lubricated pumps. How can I tell if that's what I have? Any help would be appreciated.
mufwapo
 
Stove/Furnace Make: EFM
Stove/Furnace Model: Boiler

Re: EFM 520 Major leaks

PostBy: stoker-man On: Mon Oct 13, 2008 2:33 pm

I can't speak for the pumps, but just this morning I had a guy come in for a new boiler because his 1961 boiler had leaks and the leak sealer worked around the tubes, but only for a short time.
stoker-man
 
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove

Re: EFM 520 Major leaks

PostBy: coaledsweat On: Mon Oct 13, 2008 2:50 pm

Grind and reweld them again where they leak, using a sealer is asking for trouble.
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea

Re: EFM 520 Major leaks

PostBy: Scottscoaled On: Mon Oct 13, 2008 10:54 pm

Don't they roll those tubes into place because the welds end up breaking after they expand and contract a few times? There are tube expanders on e-bay that would do the job right :) Scott
Scottscoaled
 
Stoker Coal Boiler: EFM 520x3, 700 Van Wert 800
Hot Air Coal Stoker Furnace: EFM 150, Keystoker 150
Coal Size/Type: Lots of buck

Re: EFM 520 Major leaks

PostBy: Freddy On: Tue Oct 14, 2008 4:18 am

I agree, a sealer will not work, at least not for long.
Freddy
 
Stoker Coal Boiler: Axeman Anderson 130 (pea)
Hot Air Coal Stoker Stove: Reading piece o' junk in the barn (rice)
Coal Size/Type: Pea size, Superior, deep mined

Re: EFM 520 Major leaks

PostBy: mufwapo On: Tue Oct 14, 2008 6:52 am

I did use a tube expander when I put the tubes in. I used 2 1/2" tubing but there was still about a 1/16" gap around it so I pressed them tight before welding them into place. The reason I wanted to try a sealer is because I have to cut the back of the boiler off and then cut through another layer of the water jacket just to get to the tubes. Unfortunately I can't think of a way to test this as I go. I have to put everything back together and test it all at once.
mufwapo
 
Stove/Furnace Make: EFM
Stove/Furnace Model: Boiler

Re: EFM 520 Major leaks

PostBy: mufwapo On: Tue Oct 14, 2008 6:54 am

Another question I'm unsure of is would I be able to buy just the top portion of the boiler? The base and all mechanical components work perfectly. I can't seem to locate a dealer who can answer this question.
mufwapo
 
Stove/Furnace Make: EFM
Stove/Furnace Model: Boiler

Re: EFM 520 Major leaks

PostBy: cArNaGe On: Tue Oct 14, 2008 7:42 am

That is what I was thinking. Why not just buy a new Boiler section. There was a base and S20 Stoker for sale in the papershop last week. I thought it may have been you.
cArNaGe
 

Re: EFM 520 Major leaks

PostBy: stoker-man On: Tue Oct 14, 2008 11:22 am

There are no repair parts for your boiler at efm, but you can buy a new boiler.
stoker-man
 
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove

Re: EFM 520 Major leaks

PostBy: mufwapo On: Sun Oct 26, 2008 9:23 pm

I got the leaks fixed by buying a different top from Scrapper. It's been running since Friday but I have one more question. I have it set at 3 teeth and a little over 3 air and the house hasn't called for heat hardly ever but I'm burning up about 40 lbs a day just to keep the fire burning. Is this about the least I can expect to burn? Would it be ok to go down to 1 tooth of feed?
mufwapo
 
Stove/Furnace Make: EFM
Stove/Furnace Model: Boiler

Re: EFM 520 Major leaks

PostBy: coal berner On: Mon Oct 27, 2008 10:49 am

What is your timer set for 30 min or 1 hr and how many minutes do you have it to set to run for also what is your
aquastat set at on the low and the high set point and what is the diff set at also your T stat
coal berner
 
Stoker Coal Boiler: 1986 Electric Furnace Man 520 DF
Stove/Furnace Make: Electric Furnace Man
Stove/Furnace Model: DF520