PA31 pilot reported diverting to an alternate airport when the right engine malfunctioned.

Attributes
ACN	1348580
Time
Date	201604
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	PA-31 Navajo/Chieftan/Mojave/T1040
Operating Under FAR Part	Part 91
Flight Phase	Climb
Route In Use	Direct
Flight Plan	VFR
Component
Aircraft Component	Engine
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Commercial Flight Crew Multiengine Flight Crew Instrument Flight Crew Flight Instructor
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 3600 Flight Crew Type 800
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

I departed for a local flight in a PA31 navajo chieftain. On initial climb the engine monitor indicated the right engine #4 cylinder was not producing power (no heat indication). Anticipating a problem I turned toward [an alternate airport] which has a much longer and wider runway than [the departure airport]. Right engine continued to run with no vibration. The engine monitor then began issuing a series of warnings and oil began streaming from the right engine cowling. I shut down the right engine and the prop feathered successfully. I continued on to [the alternate airport] and landed uneventfully. I'm submitting this report because I did not [advise] ATC since I was on a CTAF and busy dealing with the engine failure.

Original NASA ASRS Text

Title: PA31 pilot reported diverting to an alternate airport when the right engine malfunctioned.

Narrative: I departed for a local flight in a PA31 Navajo Chieftain. On initial climb the engine monitor indicated the right engine #4 cylinder was not producing power (no heat indication). Anticipating a problem I turned toward [an alternate airport] which has a much longer and wider runway than [the departure airport]. Right engine continued to run with no vibration. The engine monitor then began issuing a series of warnings and oil began streaming from the right engine cowling. I shut down the right engine and the prop feathered successfully. I continued on to [the alternate airport] and landed uneventfully. I'm submitting this report because I did not [advise] ATC since I was on a CTAF and busy dealing with the engine failure.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.