Nicrocraft Aircraft Exhaust System Checklist
To Prevent Carbon Monoxide Poisoning, Loss of Engine Power or Fire.
FIRST remove all muffler and stack shrouds and shields to permit full inspection.
LOOK FOR LEAKS
Examine surfaces adjacent to exhaust system components for telltale signs of exhaust soot. They reflect leakage points.
Look for gray, red or black gas stains at welds, clamps flanges, etc. (1)
Check that no part of the system is being chafed by the cowling, cables, or other parts.
Look for signs of leaks in exhaust, particularly in the area of the heater.
To verify a suspected leak, connect the exhaust outlet of a vacuum cleaner to the tailpipe. Seal around vacuum hose with duct tape. Apply soapy water or talcum powder.
Check for loose connections or binding of slip joints. (2)
Examine bends and narrow spots for thinning and pitting. (3)
PINS AND FINS
Look for missing or damaged heat transfer pins or fins - they can create a hole. (4)
Inspect all surfaces for bulging and distortion (5), and for patches of small cracks.(6)
DO NOT mark any surfaces with lead pencils or any
carboncontaining markers (they will cause cracks).
Look inside mufflers for broken baffles and tubes. (7) They can restrict the outlet causing power loss.
Inspect carefully all internal surfaces that lie hidden under external gussets or stiffeners. Check for cracked or broken spot welds. (8)
Run a borescope into the tailpipe or overboard to
inspect internal conditions.
Install only correct parts and don’t force-fit.
Do not reuse gaskets. Properly align connecting parts. (9)
Tighten nuts evenly to proper torque value (per OEM specs).
When in doubt about the airworthiness of any exhaust part, call a Nicrocraft exhaust system specialist at +1 405-672-1361.
DO NOT ATTEMPT TO WELD-REPAIR DAMAGED PARTS. REPLACE THEM WITH NEW OR OVERHAULED PARTS. NICROCRAFT PARTS ARE WARRANTED FOR 12-MONTH, UNLIMITED HOURS.