Date registered: Aug 2008
Vehicle: 2008 E320 Bluetec, 1988 560SL totalled unto death). 1997 Dodge Ram 1500, 1983 300CD
Location: Greater Metropolitan Beaverdam, Virginia
Mentioned: 3 Post(s)
Quoted: 176 Post(s)
My knowledge of the engineering system on the boat is somewhat limited since I was an electrical/acoustics engineer but I can tell you this.
As you may know, a diesel engine produces no vacuum so requires an engine-driven vacuum pump and reservoir if vacuum is to be used for control systems. In our diesel cars, the vac pump is belt-driven, on that boat there was an additional auxiliary diesel that provided "housekeeping" functions such as vacuum and electrical power. The auxiliary was also run through the Combined Diesel and Gas Turbine (CODAG) transmission so that if the aux engine failed, housekeeping power could be provided by one of the main propulsion diesels.
As an OT aside, since the boat started life as a Naval asset, the turbine and diesels were designed to run off of JP-4. We ran all engines on diesel fuel and found the boat ran faster since diesel is sea-level fuel and has a higher specific heat hence energy content per pound of fuel. The conversion simply consisted of an additional stage of filtering plus changing filters more often. All pumps and injectors were perfectly happy to drink diesel.
We surprised a lot of so-called fast cabin cruisers when we blew past them as though they were dead-in-the-water.