4089181 +0.5mm Oversize Piston Ring Set for Cumm ins ISB3.9 QSB5.9 ISBE Engine

• OEM Part Number: 4089181
• Oversize Grade: +0.50mm (matches 5332597 +0.5 piston)
• Full Name: Piston Ring Set
• Applicable Engine: Cumm ins ISB3.9, ISBE, QSB5.9, 4B3.9, 6B5.9 B Series Diesel Engine
• Matching Piston: 5332597 (+0.5 oversize repair piston)
• Ring Composition: 2 compression rings + 1 oil control ring (3-piece complete set)
• Material: Ductile cast iron, surface nitride & molybdenum spraying treatment
• Core Function: Seal combustion chamber pressure, scrape excess engine oil on cylinder wall, control blow-by gas and oil consumption

1. Strictly +0.5mm oversize tolerance, perfectly paired with 5332597 oversized piston after cylinder boring repair.
2. Surface wear-resistant coating greatly extends service life under high temperature and high pressure working environment.
3. Three-ring layered design: top ring for gas sealing, second ring for auxiliary sealing, helical spring oil ring for efficient oil scraping, effectively eliminate blue smoke and burning oil failure.
4. Precise opening gap and end clearance, stable thermal expansion performance, no ring jamming or breakage during long-term operation.

4089181 is the supporting +0.5mm oversized piston ring kit for Cumm ins B series engine overhaul, exclusively used together with 5332597 +0.5 repair piston after cylinder liner boring and honing. The first two rings undertake the sealing of high-pressure combustion gas to guarantee engine compression ratio and power output; the third combined oil ring scrapes redundant lubricating oil back to the oil pan, preventing engine oil from entering combustion chamber to cause carbon deposit and exhaust blue smoke. Each ring set undergoes gap inspection, hardness test and surface treatment quality inspection before delivery to ensure assembly reliability.

We supply parts for Kubota, Cummin s, CAT, Perkins, Yanmar, Isuzu, Komatsu, Mitsubishi, Hino, Nissan, Vol vo, Deutz, Doosan, Daewoo, John Dee re, Scania, Hyundai, JCB etc.

A: Yes, both are +0.5 oversize repair specifications, they are a matched overhaul combination and cannot be mixed with standard size pistons/rings.

A: Stagger the opening gaps of three rings at 120° to each other; do not align gaps with piston pin hole; apply clean engine oil on rings during installation, avoid twisting and deformation of oil control ring.

A: Engine power drop, high fuel consumption, exhaust blue smoke, crankcase excessive blow-by gas, oil dilution, abnormal engine noise.