Chapter 7 Inspection and Maintenance
7-8 750-177
gasket. Start tightening at the top and proceed around the
door, alternately tightening opposite fasteners until all are
snug. After the boiler is back in operation, check for gas leaks
around the door opening, and retighten the fasteners as
required to provide a gas-tight seal.
Drum Seals
Inspect the areas around the drum seals and look for soot or
hot gas leaks. If a problem is noted look for the source of the
leak. Remove the old insulation and sealant from around the
drum. Using a pumpable insulation material (p.n. 872-680),
fill the void flush with the outside of the wall. Allow the area
to set up and apply a thick bead of high temperature silicone
around the drum and install the cover plates.
Sight Port
Inspect the area around the sight port for paint discoloration.
A hot spot around the rear sight port is caused by either a poor
seal between the sight port insulator and the wall, a cracked
insulator or a flue gas leak at the sight port cap.
Check the threads of the cap and sight tube. If necessary,
clean the threads and/or replace the cap. If the screws that
hold the sight glass retainer in place are leaking tighten the
screws or replace the cap.
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