Sound insulation for motor room

[Kd9truck]

Hi all,

I am looking for recommendations on effective sound insulation For my diesel motor room.

As am contemplating re-sound proofing my Yanmar 4jh5e motor room
The outer coating is flaking off the open cell foam that was installed during commission. Right now this insulation is 2 inches thick (I would add more if it would be more effective and space allowed. I have contained this flaking outer coat with tyvec house wrap, it works well and holds up to the occasional rubbing when I need to use the access options to inspect and work on motor.

As an aside the motor mounts are in great shape and the room has an aggressive exaust fan.

To the install point has anyone made their insulation removable for when work needs to be done?

Sadly my hearing has paid the price from a career around horn sirens and loud diesel hydraulic engines.

Thanks in advance.