national 200 Front section replacement

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Dinger240
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Post By: Dinger240 » Wed. Oct. 25, 2017 3:20 pm

Does anyone have any experience changing a front section. I found another one in great shape.Not sure how to do it. Thanks

franco b
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Post By: franco b » Wed. Oct. 25, 2017 5:16 pm

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.

Pacowy
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Post By: Pacowy » Thu. Oct. 26, 2017 3:41 pm

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


franco b
Site Moderator
Posts: 9174
Joined: Wed. Nov. 05, 2008 5:11 pm
Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea
Location: Kent CT

Post By: franco b » Thu. Oct. 26, 2017 3:55 pm

Pacowy wrote:
Thu. Oct. 26, 2017 3:41 pm
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
Yes, my experience is from over 50 years ago, and things become hazy.

I would think the plastic wedges used in tree work would be good.

Thanks for jumping in with more recent experience.

Pacowy
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Posts: 3118
Joined: Tue. Sep. 04, 2007 10:14 pm
Stoker Coal Boiler: H.B. Smith 350 Mills boiler/EFM 85R stoker
Coal Size/Type: Buckwheat/anthracite
Location: Dalton, MA

Post By: Pacowy » Thu. Oct. 26, 2017 4:00 pm

You're welcome, and yes he specifically recommended the tree ones.

Mike

Dinger240
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Post By: Dinger240 » Tue. Nov. 21, 2017 7:00 pm

Should I use any type of sealant when I put it back together ?

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