Engine Bed and Alignment Work

Modification or renewal of engine beds and mounting arrangements, and alignment of engine, gearbox and shaft cold and at working temperature.

Features

Bed modification is designed rather than improvised, because the bed carries thrust and torque reaction into the hull structure.
Resilient mount selection follows the engine mass, its firing frequency and the vibration limits that apply.
Alignment is measured with dial gauges to a stated tolerance and recorded, not judged by feel.
A warm recheck is part of the job, since the engine rises on its mounts as it heats and a cold-only alignment will not hold.
Chocking, whether steel or resin, is specified with the bed design and affects how the alignment is finally set.

Figure	Typical range	Unit	Why it matters
Bed work scope	new mounting plates, aft section renewed		defines the structural work being done
Mount type	resilient, 4 off		affects vibration transmission and alignment behaviour
Alignment tolerance	0.05 over the coupling face	mm	the acceptance figure for the work
Cold and warm readings	both recorded	mm	proves the alignment holds at working temperature
Chocking	resin chocks		decides the final setting method and future re-alignment