What was found
ENGINE EXHAUST VALVE STICKING (5 TIMES) MOST LIKELY CAUSED BY OIL. THE MFG ADDITIVE IN CONTACT WITH LEAD ON THE VALVE STEM CAUSES EXCESSIVE PHOSPHOR BUILDUP AND THE VALVE TO STICK. MFG IS AWARE OF THIS PROBLEM.
- Difficulty date
- October 15, 2005
- Submitted
- October 15, 2005
- Operation
- General aviation
- Aircraft
- N996DM
- Make and model
- Doug DC6B
- Aircraft serial
- 45563
- Aircraft time
- 7,130 hours
- Engine
- Pwa R2800CB16
- System (JASC)
- 8530 · Reciprocating Engine Cylinder Section
- Part
- Exhaust Valve
- Condition
- Sticking
- Location
- Engine
- Stage of operation
- NR
- How discovered
- 9
- Nature of condition
- O
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.