I have the Empire B30 of this engine that I got it off eBay for some parts for my B35 (the complete heater). While my B35 is now operational with its parts and it is a cool engine I find it not very powerful (hardly runs Empire accessories). The B30 is actually in pretty good shape (tank finish/main base) though it was missing the proper whistle screw / whistle base but I have now decided to get it running.
The top sight glass O-Ring was completely blown and I was only blowing air into with my mouth. So I figured I'd try to take that apart as the corrosion was very low on the fitting, the top being in near perfect shape. After letting the fittings soak with liquid wrench they easily came undone and I was able to loosen the top ball just enough to get the slight glass out. Cleaning the old O-rings out was a bit of fun but now all the bits and bobs are in fine shape!
I have some 1/4” ID x 3/8” OD O-rings ordered from Granger and should have them in soon. The shipping cost more than the O-rings themselves and I get a 100 of them (so anyone needing some I'll have extras). I even took apart the B35 sight glass by doing the same procedure as the B30 (it had medium corrosion for the top and near high level at the bottom). Thank you
@Paula for the posting the O-ring size - so very helpful! I also sent you a message about your cool #91195A120 from McMaster-Carr washers for the pressure valve - hope to hear back from you.
@komet163b I'd love to see how you mount cartridge heaters / part numbers on your Empires for something like a B30/B35.