Steve, someone has told you a load of crap, there is NO and again NO shut down feature on the 333C or 3306 engine unless it has a Non OE fitment. these engine protection units that could be bought and fitted need activating on every start up, I have only seen them on D8's and 9's, if the engine speed is on higher than 1/2 speed the Rack pegging control will not work until the speed is reduced to low idle, then the engine will only idle but not shut down with NO oil pressure, hate to say it Steve but you are well outside your comfort zone with your sump pan full of metal issue, you need to firstly look at your front engine oil leak? as that sounds Not Good, then start removing the engine and avoid listening to crap off your Service pal that seems to be not gripped up with old D6's, or better still stop listening to me and waste your $$$$.
tctractors
p.s do you read these post's ??