SDR CA040415002

Service difficulty report · Valve Guide · Cessna 172

Difficulty date: April 4, 2004
Submitted: July 22, 2004
Operation: General aviation
Make and model: Cessna 172
Aircraft time: 4,234 hours
Engine: Cont O300A
Propeller: Mcauly 1A170*
System (JASC): 8530 · Reciprocating Engine Cylinder Section
Part: Valve Guide
Condition: Worn
Location: Cylinder
Component: Cylinder · Cont
Component part number: SA10200A
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) CYLINDER NR 3, 4 AND 5, EXCESSIVE OIL CONSUMPTION AND LOW COMPRESSION. ENGINE WAS RETURNED TO OVERHAUL FACILITY WHERE IT WAS DISCOVERED THAT 3 OF 6 CYLINDERS HAD EXCESSIVE PLAY IN THE EXHAUST VALVE GUIDES WHICH CAUSED THE VALVE TO BECOME COKED AND STICK IN THE GUIDE. CYLINDERS MFG. S/N: NR 3, 31109,NR 4, 31215, AND NR 5, 31213.

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