What size are the bolts securing the coil plate to Burnham V-74-T
Hi group, I am about to replace the coil on my boiler and need to order new rods and nuts in stainless steel to make it easier next time I want to service it.
Does anyone know the thread size I need?
Thank you in advance!
Comments
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Please don't use stainless steel bolts. Too brittle will break easy. Steel bolts with never-seize.
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Good to know, thank you. Do you know the size?
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Not off hand. When you order the coil order the bolts as well.
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If you can measure across the flats on the head accurately…………I can give you the size. What I cannot give you is the length. That depends on the tapped holes in the casting. We'd need to make an assumption.
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Thank you LRCCBJ. It is 1/2". I am getting rods so don't really need the length.
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If you really want to make it easier next time, be sure to use anti-seize on the threads. Otherwise you will be doing this. Scroll down to the photo of the OP cutting the bolt heads off with an angle grinder.
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Not sure which Burnham boiler you have but on my old 4B series, those bolts are described in the parts list as:
'3/8" - 16 x 3/4" LG Machine Screw'. They take a 9/16" wrench.
(And I had thought mine were stainless steel—I have to tighten them from time to time. But in looking at them now, I am not sure.)
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I'm 99% certain that they are 3/8. I'd get 1.25" studs for it.
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If you are exactly 1/2…….or slightly less…………they are 5/16" screws.
If you are 9/16………….they are 3/8" screws.
Be careful and use the one that is least corroded.
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Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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Burnham parts list has them at 3/8"-16 x 7/8"
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The idea of using rods or studs is a good idea…….with never seize of course. It gives you two chances to get the nut or the stud out instead of one
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Wow, this is great! Thank you everyone for all your help and suggestions!
I'll provide an update once finished.
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