Alert: Cessna; 170B; Oversized Exhaust Couplings; ATA 7810

Alert: Cessna; 170B; Oversized Exhaust Couplings; ATA 7810

Cessna; 170B; Oversized Exhaust Couplings; ATA 7810

This mechanic states: “Both tail pipe/muffler connections (P/N STC-8645SW) were found to be oversized. The exhaust pipe clamps were not of sufficient strength to squeeze the oversized pipe down on the muffler exhaust tube. The resulting loose fit was allowing exhaust fumes to shoot into the cabin heat and carburetor heat sections of the mufflers. One thing that aggravated the condition was the fact that the tail pipes were crammed too far up on the muffler pipe. This made it inevitable that any leakage would enter the muffler/heat shroud section. Suggest giving this area close scrutiny.”

Part Total Time: unknown.

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