h yd ra ul ic ▁actu ator ▁system ▁which ▁uses ▁the ▁existing ▁fuel ▁p umps , ▁thus ▁reducing ▁development ▁ris ks ▁of ▁the ▁new ▁system ▁by ▁employ ing ▁existing ▁technology . ▁D irection ▁changing ▁on ▁older ▁B & W ▁MC ▁engines ▁was ▁engaged ▁by ▁changing ▁the ▁direction ▁of ▁the ▁cam ▁roll er , ▁whereas ▁with ▁the ▁new ▁cam less ▁engine , ▁it ▁is ▁controlled ▁by ▁a ▁computer . ▁This ▁elimin ates ▁the ▁risk ▁of ▁mechanical ▁fail ures ▁that ▁could ▁damage ▁the ▁engine ▁if ▁there ▁was ▁a ▁mal function ▁while ▁changing ▁directions . ▁Additionally , ▁because ▁there ▁is ▁no ▁chain ▁connection ▁between ▁the ▁c rank ▁sh aft ▁and ▁the ▁cam sh aft , ▁the ▁engine ▁is ▁l ighter ▁with ▁fewer ▁points ▁of ▁failure . ▁The ▁absence ▁of ▁a ▁cam sh aft ▁also ▁means ▁that ▁the ▁par as it ic ▁load ▁on ▁the ▁engine ▁is ▁lower , ▁which ▁is ▁particularly ▁useful ▁in ▁large ▁marine ▁engines , ▁as ▁it ▁can ▁equ ate ▁to ▁a ▁large ▁amount ▁of ▁power ▁sav ings . ▁With ▁a ▁cam less ▁engine , ▁fuel ▁injection ▁and ▁exhaust ▁timing ▁are ▁directly ▁controlled ▁by ▁an ▁engine ▁control ▁unit ▁and ▁can ▁be ▁constantly ▁changed ▁and ▁adjust ed ▁without ▁stopping ▁the ▁engine . ▁This ▁allows ▁for ▁the ▁engine ▁to ▁run ▁at ▁a ▁lower ▁R PM , ▁a ▁feature ▁useful ▁in ▁ships ▁as ▁it ▁allows ▁better ▁low ▁speed ▁man eu ver ing ▁while ▁dock ing . ▁Additionally , ▁when ▁a ▁ship ▁is ▁man eu ver ing , ▁the ▁computer ▁controlled ▁fuel ▁injection ▁and ▁val ve ▁timing ▁allows