SDR WS9R10FA0000467

Service difficulty report · Thrust Washer

Difficulty date: April 21, 2010
Submitted: May 14, 2010
Operation: General aviation
Filed by: WS9R575J
Western Skyways Inc
System (JASC): 8500 · Engine (Reciprocating)
Part: Thrust Washer
Condition: Mismanufactured
Location: Engine
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

(WS9R) THE COMPONENT IS MFG WITH IMPROPER TOLERANCES. HAVE DISCOVERED THIS PROBLEM DURING ENGINE O/H. THE THICKNESS OF THIS COMPONENT VARIES FROM .092-.097 INCHES. THIS THRUST WASHER IS FOUND IN MAIN BEARING SET FOR THESE ENGINES. THIS ISSUE MAKES OBTAINING PROPER CRANKSHAFT THRUST CLEARANCE NEARLY IMPOSSIBLE, IAW MFG MM.