SDR 20010420CW010

Service difficulty report · Retainer · Piper PA60600

Difficulty date: September 26, 2000
Submitted: April 20, 2001
Operation: General aviation
Aircraft: N5FA
Make and model: Piper PA60600
Aircraft serial: 600310115
Engine: Lyc IO540K1J5
System (JASC): 8530 · Reciprocating Engine Cylinder Section
Part: Retainer
Condition: Loose
Location: Rocker Pin
Stage of operation: IN
How discovered: V
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

DEFECT OCCURED UNDER NORMAL CIRCUSTANCE ON A FRESH FACTORY OVERHAUL. NR 4 CYL INTAKE ROCKER RETAINER, BONDED TO VALVE COVER, CAME LOOSE ALLOWING ROCKER PIN TO SLIDE OUT. ROCKER JAMMED AND BY FORCE OF PUSHROD, BROKE ROCKER SHAFT HOUSING, PART OF CAST ALUMINUM HEAD. ALSO NR 4 INTAKE TAPPET JAMMED IN CASE AND BROKE INTO SEVERAL PIECES. PUSHROD DENTED VALVE COVER ABOUT .3750 INCH DEEP DIMPLE FROM INSIDE. ROCKER RETAINER SHOULD BE WELDED OR RIVETED TO VALVE COVER.