SDR CA071011009

Service difficulty report · Rocker Shaft · Cessna 180A

Difficulty date: October 11, 2007
Submitted: October 24, 2007
Operation: General aviation
Make and model: Cessna 180A
Aircraft time: 4,934 hours
Engine: Cont O470K
Propeller: Mcauly 2A34C203
System (JASC): 8530 · Reciprocating Engine Cylinder Section
Part: Rocker Shaft
Part number: 652984
Condition: Damaged
Location: Nr 4 Cylinder
Part time: 400 hours
Stage of operation: IN
How discovered: 9
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

(CAN) POOR DIFF ON INSPECTION, EXH VALVE ROCKER SHAFT FOUND DAMAGED DUE TO LACK OF OIL, CAUSING OVERHEATING AND FAILURE OF ROCKER BUSHING. VALVE DAMAGED DUE TO LACK OF COOLING OIL ALSO. CAUSE OF OIL LOSS TO ROCKER UNKNOWN, MAY POSSIBLY HAVE BEEN A BLOCKED GALLERY AT SOME POINT. (TC NR 20071011009)

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