Oil Control Ring OE C5477378 for Cummins Engine | Genuine Truck Part

This oil control ring OE C5477378 is manufactured in full compliance with Cummins original engineering standards, using high-strength alloy steel as the base material and adopting vacuum nitriding surface treatment, which greatly improves surface hardness, wear resistance and high-temperature oxidation resistance. The product adopts a three-piece combined oil control structure with precision-ground working surface, forming uniform and stable contact pressure on the cylinder wall, accurately scraping excess lubricating oil back to the oil pan without excessive wear. It has excellent elastic recovery performance, maintaining stable sealing force in long-term high-speed and high-temperature engine operation, effectively controlling oil film thickness and preventing oil from entering the combustion chamber. The strict dimensional tolerance control ensures perfect matching with the piston ring groove, no jamming, no looseness, providing stable and efficient oil control sealing for Cummins diesel engines.

Fully compatible with all applicable Cummins diesel engine models, this oil ring can be accurately cross-checked via OE C5477378 to ensure perfect matching. It solves a series of common engine failures caused by inferior oil rings, including poor material leading to rapid wear, insufficient elasticity resulting in poor sealing, rough machining causing cylinder wall scratch, and unstable structure leading to oil blow-by and high oil consumption. Abnormal oil control will cause excessive oil consumption, black smoke emission, carbon deposit accumulation, piston ring sticking and even cylinder scoring, seriously shortening engine service life and increasing operation and maintenance costs. By using this genuine Cummins oil control ring, users can completely eliminate oil leakage, high oil consumption, carbon deposit and abnormal wear problems, restore normal engine lubrication and combustion state, and reduce frequent maintenance and overhaul.

As a core precision component of Cummins engines, this oil control ring meets strict OEM manufacturing standards and passes third-party authoritative tests for wear resistance, high-temperature stability, elasticity fatigue and sealing performance. Test data shows that the product has no obvious wear after 2000 hours of continuous bench test, maintains stable sealing pressure, and does not lose elasticity or deform under long-term high-temperature and high-pressure working conditions. Each oil ring undergoes 100% full-size inspection, surface hardness test and sealing performance verification before leaving the factory, with dimensional tolerance controlled within micron level, fully consistent with Cummins original parts in material, performance and assembly effect. It has excellent adaptability to heavy-duty, high-load and long-time operation conditions, with reliable quality and long service life, providing users with worry-free engine operation guarantee.

We are a professional supplier of genuine Cummins engine parts, providing original factory quality piston rings, cylinder components and engine maintenance parts for global customers, repair factories and fleet operators. This oil control ring OE C5477378 is supplied with complete Cummins original packaging and traceability code, ensuring 100% genuine and authentic. We provide a 12-month quality warranty against material defects, wear failure and sealing failure under normal use. Our professional technical team provides 24/7 engine model matching, installation guidance and after-sales consultation. We support bulk wholesale with competitive prices and stable supply for large fleet customers. Choosing this genuine oil control ring can effectively reduce engine oil consumption, avoid major engine failures, extend overhaul cycle, reduce operating costs, and provide stable and efficient power support for your Cummins engine equipment.