national 200 Front section replacement
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The older boilers have the sections connected by push nipples which are tapered smooth bushings. Undo any tie rods and then tap in something wedge shaped like a cold chisel close to the nipples, a little bit to each in turn. The location of the nipples are easily seen by the rounded portions of the casting. Usually one at each lower corner and possibly one big one on top.
Assembly is the opposite by gradually drawing together with the tie rods. Once drawn together loosen the tie rods to allow for expansion. Some have a soft washer to absorb expansion.
Assembly is the opposite by gradually drawing together with the tie rods. Once drawn together loosen the tie rods to allow for expansion. Some have a soft washer to absorb expansion.
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fb,
Whistlenut once advised me to use hard plastic as the wedge, to minimize the possibility of having bad things happen.
Some of the old sectional boilers, like HB Smith, connected the sections to the header and mudlegs, but not to each other, so they had no push nipples. The Nationals I've seen were set up as you say, but I haven't been able to find a pic of a 200 to confirm.
Mike
Whistlenut once advised me to use hard plastic as the wedge, to minimize the possibility of having bad things happen.
Some of the old sectional boilers, like HB Smith, connected the sections to the header and mudlegs, but not to each other, so they had no push nipples. The Nationals I've seen were set up as you say, but I haven't been able to find a pic of a 200 to confirm.
Mike
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- Site Moderator
- Posts: 11416
- Joined: Wed. Nov. 05, 2008 5:11 pm
- Location: Kent CT
- Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
- Baseburners & Antiques: Glenwood Modern Oak 114
- Coal Size/Type: nut and pea
Yes, my experience is from over 50 years ago, and things become hazy.Pacowy wrote: ↑Thu. Oct. 26, 2017 3:41 pmfb,
Whistlenut once advised me to use hard plastic as the wedge, to minimize the possibility of having bad things happen.
Some of the old sectional boilers, like HB Smith, connected the sections to the header and mudlegs, but not to each other, so they had no push nipples. The Nationals I've seen were set up as you say, but I haven't been able to find a pic of a 200 to confirm.
Mike
I would think the plastic wedges used in tree work would be good.
Thanks for jumping in with more recent experience.