Table 4-1. Unit Troubleshooting Procedures (Cont).
TEST OR INSPECTION
12. LEAK IN VIEWPORT ASSEMBLY.
Step 1. Inspect viewport mounting screws for tightness.
Tighten loose screws.
Step 2. Visually inspect the viewport for cracks or chips.
Notify your supervisor of any defects found.
13. LEAK IN ADAPTER ASSEMBLY.
Step 1. Visually inspect the suspect air supply adapter.
Replace the defective preformed packing (para. 4-19) and leak test the adapter.
Step 2. Visually inspect the suspect preformed packing or gasket.
Replace the defective preformed packing or gasket (para. 4-19).
Step 3. Inspect the suspect adapter for properly installed preformed packing and body properly
secured to form a seal with the base.
Replace the preformed packing if loose (para. 4-19).
Step 4. Inspect for loose or missing screws.
Replace if missing, tighten if loose.
14. LEAK AT SUPPLY VALVE MOUNTING.
Step 1. Inspect the preformed packing for cuts, nicks or deterioration.
Replace the preformed packing (para 4-21).
Step 2. Remove the supply valve and visually inspect the penetrator-to-shell seal.
Remove the penetrator and clean away the old sealant (para. 4-21).