Draw rod tightness on 1959 AS boiler

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thetallguy

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Hello, I have a 1959 American Standard boiler. I removed the outer covers and cleaned the soot from the heat exchanger(?). I think that’s right. But anyway, I noticed the 2 draw rods (3/8”x19.5” long each) had broken. It looked like it’s been awhile. I bought some 3/8” all thread to replace. Question, how tight should the bolts be?
 

Fitter30

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