Home » Tony’s Tips » Articles » Learning your Cummins Marine QSB 5.9 EngineLearning your Cummins Marine QSB 5.9 Engine QSB 5.9 4 – Groove Pulley PTO Drive QSB 5.9 Fuel Out QSB 5.9 Intake Manifold Temp and Boost sensor QSB 5.9 Mrcury SmartCrap 1.0 Electronics QSB 5.9 Damper views-Early Style vs Late style QSB 5.9 Early Oil line connections QSB 5.9 Factory Valve cover breather Hose Connection QSB 5.9 Fuel Connections QSB 5.9 Fuel inlet QSB 5.9 Late Belt Wrap & Large Frame Alternator QSB 5.9 Oil & Fuel filters QSB 5.9 Starter Connections QSB 5.9 thermostat & Coolant temp sender QSB 5.9 Walker Airsep QSB 5.9 Walker Oil Return Check Valve QSB Large Frame alternator mounting