Flat Bed Plate
There are transverse plate floors at each frame. The thickness of the engine seating is governed by the power, weight,and length of th eunit
Small Drop-raised Seat
Large Drop-raised seat
Historically the engine bolts at the after end of the engine were fitted bolts to take the shear of the thrust and the more for'd bolts were loose fit bolts allowing for expansion.
This method has proved unreliable and the more modern practice is to weld lugs on the bedplate and have brackets and fitted chocks
The holding down arrangement should be arranged to be above any bilge water level to allow for easy access and inspection