SDR 95ZZZX1616

Service difficulty report · Wrist Pin · Cessna R172K

Difficulty date: February 20, 1995
Submitted: March 26, 2000
Operation: General aviation
Aircraft: N736DN
Make and model: Cessna R172K
Aircraft serial: R1722446
Engine: Cont IO360K
System (JASC): 8530 · Reciprocating Engine Cylinder Section
Part: Wrist Pin
Part number: SA629690
Condition: Failed
Location: Nr 3 Cylinder
Part time: 60 hours
Stage of operation: NR
Nature of condition: O
Precautionary procedure: K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

PISTON WRIST PIN BROKE IN NR 3 CYLINDER CAUSED PISTON SKIRT TO BREAK. POLLUTED THE ENGINE WITH ALUMINUM. DAMAGED NR 3 CYLINDER, ROD, AND NR 4 PISTON WAS MARRED. THE ONLY INDICATION OF A PROBLEM WAS THE OIL PRESSURE DROPPED OFF TO HALF OF NORMAL DUE TO METAL PARTICLES GETTING INTO PRESSURE SEAT.

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