CUMMINS_INDUSTRIAL:
• Cummins 6C8.3/6CT8.3/6CTA8.3/ISC8.3 6CT 8.3L Diesel (1985-2000)
• Cummins QSC8.3 6CT 8.3L Diesel (1985-2000)
CASE_IH_TRACTORS:
• Case IH 4210/4230/5120/5130 6CT 8.3L Diesel (1985-2000)
• Case IH 5140/5150/7110/7120 6CT 8.3L Diesel (1985-2000)
• Case IH 7130/7140/8910/8920 6CT 8.3L Diesel (1985-2000)
• Case IH 8930/9170/9180/9210 6CT 8.3L Diesel (1985-2000)
CASE_IH_COMBINES:
• Case IH 1666/1688 6CT 8.3L Diesel (1985-2000)
IMPORTANT:
84-tooth camshaft gear for Cummins 6CT/6CTA/ISC/QSC 8.3L engines (222.25mm OD). Supersedes 3901967, 3907677, 3917328. This is the CAMSHAFT gear — do NOT confuse with the 42T crankshaft gear (3918776). The cam gear runs at half engine speed.
Used in Case IH tractors (4210-5250), Hyundai excavators, and various industrial/marine. A worn camshaft gear causes valve timing drift — symptoms include loss of power, increased exhaust temperature, and rough idle. Mark timing position before removal. Inspect the idler gear and crankshaft gear when replacing.
⚠️ Camshaft gear (84T). Crankshaft gear (42T) is 3918776 — different part.
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