Mercedes-Benz MB517 engine

{{Infobox automobile engine

|name=Mercedes-Benz MB517

|manufacturer= Mercedes-Benz

|production=1944

|configuration=60° V12

|bore={{convert|6.22|in|mm|1|lk=on|abbr=on}}

|stroke={{convert|7.09|in|mm|1|lk=on|abbr=on}}

|displacement={{convert|42.35|L|cuin|0|lk=on|abbr=on}}

|valvetrain=24-valve, SOHC, two-valves per cylinder

|power={{convert|1200-1375|hp|kW|0|lk=on|abbr=on}}

|torque= {{convert|2520-3140|lb.ft|N.m|0|lk=on|abbr=on}}

|supercharger=Roots-type supercharger

|fuelsystem=Fuel injection

|fueltype=Diesel

|coolingsystem=Water-cooled

|compression=17.0:1

|oilsystem=Dry sump

|weight={{convert|790-920|kg|lb|0|lk=on|abbr=on}}

}}

The Mercedes-Benz MB 517 was a supercharged, four-stroke, V-12 diesel marine engine version of the MB 507; derived from the MB 503 gasoline engine. The MB 507 was also based on the Daimler-Benz DB 603 inverted V-12 aircraft engine, and shared an identical bore, stroke, and displacement. Unlike the gasoline-powered MB 503, the diesel-powered MB 507 did not use a supercharger.{{Cite web|url=http://ftr.wot-news.com/2014/11/25/maus-engine-by-captiannemo/|title=Maus Engine by CaptianNemo | For the Record|website=Ftr.wot-news.com|date=25 November 2014 |access-date=12 November 2021}}{{Cite web|url=https://oldmachinepress.com/2017/03/05/mercedes-benz-500-series-diesel-marine-engines/|title=Mercedes-Benz 500 Series Diesel Marine Engines|first=William|last=Pearce|website=Oldmachinepress.com|date=5 March 2017|access-date=12 November 2021}}{{Cite web|url=https://warspot.net/343-how-the-wehrmacht-s-diesel-stalled|archive-url=https://web.archive.org/web/20210512112628/https://warspot.net/343-how-the-wehrmacht-s-diesel-stalled|url-status=usurped|archive-date=May 12, 2021|title=How the Wehrmacht's Diesel Stalled|website=Warspot.net|access-date=12 November 2021}}