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Inspection and Maintenance
Chapter 7
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.
750-364
7-7
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