Karl,
You suggested that there was a problem with reliability of Perkins engines.
Although the 4 107/108 series have had some problems (often related to improper use)--there are many of these engines in operation which have well over 10,000 hours on them.
The larger 4 and 6 cyl Perkins are indeed very reliable engines, and 10,000 to 15,000 hours on a well cared for engine before overhaul is not at all unusual. They are used in many sailboats and Trawlers, as well as trucks, cars, RV's and stationary (mobile) power plants. Currently Perkins is owned by Caterpillar.