Oddly enough, BEagle, in my many hours on the 'ole DC-6B, I never experienced any engine problems, let alone a fire.
Propellor overspeeds...another kettle of fish altogether.
Had two of those...that was quite enough.
On another forum, I posted about propellor problems and how they can be quite deadly...
I personally witnessed this terrible accident, and oddly enough, this was the only DC-6 ever produced equipped with Curtis Electric propellers.
When a propeller malfunctions, or as in this case, a blade separation, the results are many times quite fatal.
The 'ole DC-6 was a wonderful airplane to fly, and it does surprisingly well on two engines, but not with the landing gear extended.
http://www.avsaf.org/reports/US/1976...ouglasDC-6.pdf
Here is another example of a propeller problem.
All DC-6's that I flew were equipped with a Martin Bar, and it surely was necessary.
http://www.avsaf.org/reports/US/1955...Lines_DC-6.pdf