The Perkins 4.108 was most commonly used. Mercedes and Pathfinder also used.
Repower Recommendations
The Beta 43 and 50 have always worked well with this vessel.The Passport 40 propeller diameter is limited to 17-18.The Beta 43 or 50 with a 2:1 gear reduction works well with this propeller size and does not over power the available blade area.
These naturally aspirated and all mechanical fuel injection engines provide trouble free operation. The low RPM operating range provides quiet power and fuel economy. With no turbocharger heat and noise, the Beta engine works very well in the confines of the rather tight Passport 40 mid-ship engine box.