3938177 Cummins Piston Ring Set For 6BT/4BT/ISB Engines

Product Overview:

Cummins 3938177 piston ring set is OEM replacement rings for B series 3.9L & 5.9L diesel engines. Each set includes 3 rings per cylinder: top compression ring, second taper-faced ring and spring loaded oil control ring. Manufactured to original DCEC dimensional tolerances, perfectly compatible with factory pistons for 4BT3.9, 6BT5.9 2-valve engines. Widely used in light trucks, construction machinery, generator sets and marine auxiliary engines to restore cylinder sealing.

3938177 piston ring set Specification:

✅Construction Equipment: 5–20 ton excavators, wheel loaders, bulldozers, air compressors

✅Stationary Power: 50–160kW diesel generator sets, mining & irrigation power units

✅Marine Power: Small fishing boats, inland river auxiliary marine engines

Key Features：

✅High temp plasma ceramic coating, 40% longer service life

✅Spring split oil ring cuts oil burn & blue smoke

✅Taper second ring boosts sealing, lowers fuel use & black smoke

✅OEM dimensional match, fits stock pistons without sticking

Why Choose Us？

✅Original OEM 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