Description

The Cummins Piston 3919247 (Standard Size) —identified by the “9247” crown marking —is an OEM-spec piston designed for 6CTA 8.3 diesel engines . Manufactured to precise factory tolerances, this piston delivers accurate fitment, stable compression, and dependable durability in Cummins engines . Piston crown markings are critical during assembly to ensure the correct piston is installed for the engine’s combustion geometry and compression requirements. The “9247” marking corresponds to part number 3919247 , commonly specified in 6CTA 8.3 rebuild and overhaul applications . Using the correct marked piston helps maintain factory compression ratios, efficient combustion, and long service life. This piston features precision-machined ring lands, controlled thermal expansion characteristics, and an optimized skirt profile to reduce friction and improve stability under load. When paired with the correct piston ring set, pin, bushings, and retainers, it helps restore factory performance, control oil consumption, and reduce blow-by. The 3919247 piston is commonly installed during 6CTA 8.3 engine rebuilds, in-frame overhauls, and professional remanufacturing projects . It is trusted by diesel technicians and engine builders who require OEM-level reliability and correct piston identification. Identification & Fitment Notes Part Number: 3919247 Crown Marking: “9247” Engine Platform: Cummins 6CTA 8.3 Size: Standard (STD) Category: Piston & Components Fitment Note: Always verify crown marking and engine specifications before installation.