3918315 3904531 3932520 Cummins B Series Pistion Ring

Product Overview:

Cummins 3918315, 3904531, 3932520 Piston ring for Cummins 4BT3.9 / 6BT5.9 / QSB5.9 diesel engines, 102mm bore.Precision-machined steel rings integrate compression & oil control functions, tight combustion sealing, low oil consumption and long wear life for trucks, generators & construction machinery.

Key Features:

✅Great Wear Resistance: Plasma ceramic chrome coating tolerates 850°C heat, 40% longer service life for heavy-duty use

✅ Low Oil Burn: Spring split oil ring balances cylinder oil film to stop oil blow-by & blue smoke

✅Tight Gas Sealing: Taper second ring boosts cylinder pressure, cutting fuel use & black smoke

✅Heat Stability: Heat-treated anti-deformation design maintains roundness under sustained heavy loads

✅Direct Installation: Pre-calibrated end & side clearances, no extra machining needed for overhaul

Application Scenarios:
✅Automotive: 1989-1998 Dodge Ram 2500/3500 with 5.9L 12V Cummins diesel engines; Dongfeng commercial trucks (153 series)

✅Construction Machinery: Komatsu PC200-5/6/7, PC220-5/6/7 excavators; loaders, bulldozers, cranes

✅Power Generation: 50-150kW diesel generator sets

✅Marine: Main propulsion engines and auxiliary generator sets for small vessels

✅Agriculture: Tractors, harvesters and other agricultural equipment

Why Choose US?

✅Genuine Original Cummins Quality & China Cummins authorized supplier of Price Advantages.

✅Sufficient stock, flexible global logistics & fast delivery

✅Free technical support for model and full overhaul kit matching

✅Full dimensional, hardness & coating testing for consistent quality