Replace Furnace Nozzle (Fuel Oil)

   #1  

CobyRupert

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First time that I'm changing out the nozzle on my, fuel oil furnace.

About to put new nozzle in and I notice that you can hear a rattle (like a bearing ball) in the nozzle adaptor, that the nozzle screws into, when you tilt the fuel line assembly.

Is this normal? Is there a ball in there that acts like a anti-siphon or something? (I didn't give it the Monica test)

If so, another problem is sometimes when I tilt it, I don't hear the rattle, almost like it's stuck, until I give it a tap and then it I can hear it again. Until it gets stuck again. When stuck, it seems I can still blow through it.

I found this picture which is almost identical to my assembly. I asking about the brass adaptor fitting on the left end that the (unshown) nozzle would screw into.
Thanks

Nozzle assemly.jpg
 
   #2  

George2615

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I have a similar if not the same type nozzle for my furnaces. When the nozzle is removed as your picture shows nothing rattles if I shake it and air (or fuel) will blow through easily. Inside the nozzle tip there are parts that will rattle if they come unscrewed. Not sure if there is a check ball in there or not. I hear no rattle on mine with the nozzle removed. Once a year I change the nozzle tip. Then take the old one apart and clean it in lacquer thinner or similar solvent then reassemble and put back on the shelf for next year. I always keep a couple spare tips around as my filter doesn't seem to catch all it should.
 

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   #3  

TCJatko

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I thought wear was a factor in replacing nozzles. And shouldn't a nozzle replacement go in conjunction with a cleaning and a general tune up? To get max. efficiency you need to adjust the airflow after the new nozzle is in place.
 
  
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CobyRupert

CobyRupert

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Thanks for replies.

The rattle is not from the nozzles.
I'm getting a rattle from inside the nozzle adaptor, the fitting the nozzle screws onto. I get this after the nozzle has been removed.
 
  
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CobyRupert

CobyRupert

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Further internet searching says that in the nozzle line is a "vent plug"?

Not sure what that is, or how it operates. Or if it should rattle?
I still wonder if it is operating correctly?
Whatever I hear moving seems to "stick" often, but not every time, and I call draw/blow air through no matter position?
 
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George2615

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I have a spare unit like the pic in the first post. I just removed the brass piece from the line and found nothing inside and air blows through both ways. Delavan calls it an adaptrap, this site calls it a nozzle adapter. So not sure what the rattle in yours is coming from.
1/8 oil nozzle adapter, 1 3/8" long, Delavan 28737-1

Their picture shows it on the wrong side of the fuel pipe but same adapter.
 
  
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CobyRupert

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Thanks George!
But now I think the "vent plug" is in the nozzle line (tube) portion, and maybe that is what rattled? What do you see when you look into the fuel line line portion with the adaptor off? What do you see when you look through the adaptor?

Well, I really scooched the pooch! I tried to take off the adaptor from the fuel line tube and instead of unthreading, it twisted/sheared the fuel line tube right off. Broken. Probably a rookie move. But something randomly sticking didn't seem right either, so I figured why not keep taking it apart? Probably should of just soaked it in cleaner instead.

So now I'm really at a loss, cause I don't know exactly what is inside this tube that needs to be replaced. Adaptor also needs replacement because it still has the broken fuel lines threads in it.
 
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George2615

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Sorry to hear you twisted the line off. Now you'll have to go to your local heating / furnace supply house for a replacement. Mine unscrewed with a pipe wrench with a cloth wrapped around the tube. Guess I got lucky. I did not see anything inside the tube itself once the brass adapter was removed. The adapter I could not see through. It has a couple holes around the outer edge for fuel to get through what looked like a baffle plate but no moving parts inside.
 
  
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Thanks for all the effort!
Yes, similar here. I can see a baffle with small fuel hole in the adaptor. And also when I look into the tube, it looks like I see another baffle inside the tube. I'll have to see if the rattle is gone. Maybe something was in between "baffles"?
 
  
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Follow up:
Not a "baffle" I was seeing in the tube, but the "vent plug".
The "vent plug" in the tube is basically a 6" metal rod. That's it. Not sure how it actually works or what it does.
It definitely is the source of the "rattle". Lesson learned!
I think it gets "stuck" sometimes in the bend of the tube, and then falls back and is stopped at the baffle in the adapter.
 
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The vent plug/rod is there to dissolve any air bubbles that may be in the oil. It floats inside the tube so it's normal to rattle around inside. Now that it's broke your best bet is to take it to your local oil heating co. and have them match it up with one of the same length. They might have a junk pile you can pick through...Its very important to find one of the same length or you'll have to have a service tech set up the burner. The part you broke is called the Drawer Assembly. If you measure the length I might have one I can send you. What model burner?
 

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The vent plug/rod is there to dissolve any air bubbles that may be in the oil. It floats inside the tube so it's normal to rattle around inside. Now that it's broke your best bet is to take it to your local oil heating co. and have them match it up with one of the same length. They might have a junk pile you can pick through...Its very important to find one of the same length or you'll have to have a service tech set up the burner. The part you broke is called the Drawer Assembly. If you measure the length I might have one I can send you. What model burner?

If available, the best "fix" is natural gas.
We had oil for years, then natural gas came down the road.
Now, no more expensive burner tune ups/burner parts, and no more tank with a leak potential.
Gas Co. even sold me the boiler..CHEAP!
 

LouNY

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Morning, Hope you had or found a spare tube to get your burner back on line, temps are dropping today.
 
  
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Morning, Hope you had or found a spare tube to get your burner back on line, temps are dropping today.

Thanks Lou.
Found shelves of furnace tubes of various sizes at F.W. Webb in Queensbury. And bins of nozzles. First time in that store. Man, that's a man's man hardware store! (Well, actually a plumbing, heating, industrial supply store that would gladly sell to both sexes :rolleyes:).
Don't know if I'll get it installed tonight before turkey traveling on Wednesday. I primarily heat with wood, the furnace probably runs <20 hours a year, with the Thanksgiving away time being a few of them. Don't think the house will freeze up between Wed & Sat, but I bet it'll be cool inside when we get back.

Natural gas is not an option for most of the county.

Wondering: Does a furnace running so few hours with long intervals between starts have negative effects?
 

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It does indeed. A well-used and maintained oil furnace can last for decades. The keywords they are being maintained. I recommend getting a professional out to have a look.
 

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Not that it matters, but the writing is on the wall... in about 40 years from now, oil furnaces will be no more (and that writing was on the wall close to 10 years ago).

Use to own a Bacharach combustion test kit myself for oil work (let along a cheap Z gauge LOL), don't use it anymore nor do I ever intend to. An oil heating system is a completely different animal. Don't miss it, never will.
 

LouNY

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Thanks Lou.
Found shelves of furnace tubes of various sizes at F.W. Webb in Queensbury. And bins of nozzles. First time in that store. Man, that's a man's man hardware store! (Well, actually a plumbing, heating, industrial supply store that would gladly sell to both sexes :rolleyes:).
Don't know if I'll get it installed tonight before turkey traveling on Wednesday. I primarily heat with wood, the furnace probably runs <20 hours a year, with the Thanksgiving away time being a few of them. Don't think the house will freeze up between Wed & Sat, but I bet it'll be cool inside when we get back.

Natural gas is not an option for most of the county.

Wondering: Does a furnace running so few hours with long intervals between starts have negative effects?

Yes, that's a pretty good store, Sawyers is also.
Yep, I don't think I'll ever see natural gas available, or fast reliable internet or cable tv.
One problem with not running an oil burner regularly is that the fuel will gum up sometimes in the smaller lines and nozzle,
plus you can get algae in the tank which can be a royal pain,
also the fire brick in the combustion chamber will absorb moisture and start to break down.
My oil fired boiler provides my hot water so it runs a bit everyday. If you need a service tech Barnett Fuels has a guy that's supposed to be good.
I ended up using coal as my auxiliary heat source, wood being such a pain to keep a head off.
Enjoy your Holiday
 
 
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