CATERPILLAR-PISTON-NOZZLE-BOLT

100-4841 is the retaining bolt for a piston cooling nozzle on Caterpillar engines — the small jet that sprays oil up into the underside of the piston crown to control piston temperature under load. If this bolt backs out or the nozzle isn't seated correctly, oil pressure to that piston's cooling jet drops, which over time shows up as accelerated piston wear on that one cylinder specifically. Orange.net.za ships this part fast, South Africa-wide.