Cummins engine spare parts exhaust manifold C5612673 in stocked

Built to endure the extreme thermal stress of high-power engine exhaust, this exhaust manifold is crafted from Si-Mo ductile cast iron (ASTM A536 Grade 80-55-06)—a material with exceptional high-temperature strength and thermal fatigue resistance. It maintains structural stability at continuous operating temperatures up to 850℃ and peak temperatures of 1050℃ (during engine startup and heavy-load operation), far exceeding the performance of ordinary gray cast iron. The material’s thermal conductivity of 42 W/(m·K) ensures uniform heat distribution, reducing localized hot spots that cause manifold cracking. Through 500 thermal cycle tests (-40℃ to 800℃), it shows no deformation or crack propagation, ensuring reliable performance throughout the engine’s service life

Engineered with advanced computational fluid dynamics (CFD) simulation, the manifold features a streamlined, equal-length runner design that optimizes exhaust gas flow. Each cylinder’s exhaust runner (63mm inner diameter) is precisely calibrated to ensure equal backpressure (≤0.08MPa at 2000rpm), eliminating exhaust gas interference between cylinders and improving scavenging efficiency by 12%. The merged collector (120mm outlet diameter) smoothly guides exhaust gas to the turbocharger, increasing turbo spool-up speed by 0.3 seconds and boosting low-end torque by 8%—critical for heavy trucks climbing slopes or starting with full loads. This optimized flow also reduces exhaust energy loss, indirectly improving fuel efficiency by 3-5% compared to aftermarket manifolds with irregular runner shapes

To address the common issue of thermal cracking in exhaust manifolds, C5612673 integrates multiple reinforced structural features. The runner walls (12mm thickness) are thickened at stress concentration areas (flange junctions and bends), and integrated rib structures (8mm thickness) are added to connect adjacent runners, enhancing overall rigidity by 30%. The turbocharger flange uses a double-layer reinforcement design, with a 20mm-thick mounting surface that resists warping under high temperatures. The manifold’s internal surface is precision machined to a roughness of Ra ≤1.6μm, reducing exhaust gas friction and minimizing carbon deposit formation. These design elements ensure the manifold maintains a leak-tight seal, with an exhaust leakage rate of ≤0.02L/min—far below the industry limit of 0.1L/min

The exhaust manifold features a multi-layer anti-corrosion coating system to withstand the corrosive components in diesel exhaust. The surface undergoes shot blasting, phosphating, and high-temperature ceramic coating (100μm thickness)—resisting oxidation, sulfur corrosion, and particulate matter abrasion. It passes 1000-hour salt spray testing (ASTM B117) with no rust and 500-hour exhaust gas exposure testing with no coating peeling. Installation is streamlined: the 12 mounting bolts align perfectly with the cylinder head’s original holes, and the manifold comes with high-temperature gasket (OE part C5612676) pre-installed. A team of two technicians can complete replacement in 2 hours, 40% faster than non-OE manifolds. With a service life of ≥200,000km and compatibility with Cummins’ original maintenance protocols, it minimizes replacement frequency and long-term operational costs for fleet operators