Service difficulty report · Plug · Cessna 172N

Difficulty date
August 11, 2000
Submitted
August 11, 2000
Operation
General aviation
Aircraft
N734QM
Make and model
Cessna 172N
Aircraft serial
17269031
Engine
Lyc O320H2AD
Part
Plug
Condition
Failed
Stage of operation
IN
How discovered
V
Nature of condition
R
Precautionary procedure
O

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

What was found

ENGINE DOES NOT HAVE T-MOD\ WHEN CHANGING VALVE COVERS. FOUND LYC PN LW-LW15316 EXHAUST (GASKETS) VALVE CAP LAYING IN BOTTOM OF VALVE COVER, LIFTER P/N LW-16586, WAS NOT PUMPED UP WITH OIL AND WAS BLED DOWN. THIS MAY HAVE ALLOWED THE CAP TO FALL OUT. ENGINE DID HAVE 3 BROKEN SPARK PLUGS. RHM-40E CERAMIC INSERTS WERE BROKEN LOOSE AND ENGINE RUN ROUGH AT START-UP, BUT THEN SMOOTHED UP SOMEWHAT. SUBMITTER DID NOT SUSPECT A LIFTER PROBLEM. (X)

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