CATERPILLAR-PISTON-NOZZLE-VALVE

6I1074 is a piston nozzle valve for Caterpillar engines — the small check valve inside the piston cooling circuit that opens under oil pressure to allow the cooling spray and closes when pressure drops, preventing oil drain-back when the engine isn't running. A stuck valve here either starves the piston of cooling oil under load or lets oil drain excessively at shutdown, both of which point back to this one small component during a piston cooling diagnosis. Orange.net.za ships this part fast, South Africa-wide.