SDR 95ZZZX3131

Service difficulty report · Piston Pin · Cessna 421B

Difficulty date: May 31, 1995
Submitted: March 26, 2000
Operation: General aviation
Aircraft: N1587G
Make and model: Cessna 421B
Aircraft serial: 421B0817
Engine: Cont GTSIO520H
System (JASC): 8530 · Reciprocating Engine Cylinder Section
Part: Piston Pin
Part number: 630046
Condition: Wrong Part
Location: Nr 5 Cylinder
Part time: 523 hours
Stage of operation: IN
Nature of condition: W
Precautionary procedure: K

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

What was found

AFTER REMOVAL OF NR 5 CYLINDER DUE TO LOW COMPRESSION (PAST THE RINGS), NOTED THE PISTON PIN WAS SHORTER THAN USUAL. FROM ITS APPEARANCE, IT WAS FROM A SMALLER BORE CYLINDER LIKE AN O-470. SHORT PINS WERE ALSO FOUND IN NR 3, NR 4, AND NR 6.

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