Engine core components form the structural and rotating heart of a Cummins engine. This includes the cylinder block, cylinder heads, pistons and liners, crankshaft, camshaft, connecting rods, main bearings, and the flywheel or flexplate assembly. These components work together to convert combustion energy into rotational power. During a major overhaul, worn engine core components are inspected, measured, and replaced to restore the engine to its original performance specifications. Correct selection of components — particularly piston kits, liner kits, and bearing sets — is essential because Cummins engines are manufactured to tight tolerances, and using the wrong specification can result in incorrect compression ratios, bearing clearances, or timing.
AMS Parts supplies a wide range of engine core components for Cummins engines used in power generation, marine, and industrial applications. Browse a selection of available parts below, or contact us for specific requirements.
Below is a selection of engine core parts we supply. Use the search bar above to find a specific part number, or request a quote. You can also reach us directly at [email protected] or +44 7776 800169.
Overhaul intervals vary by engine model, application, and operating conditions. Common indicators include increased oil consumption, loss of compression, excessive blowby, bearing knock, or reaching the manufacturer's recommended overhaul hours (often between 12,000 and 20,000 hours depending on the platform). An oil analysis programme can help predict the right timing.
An in-frame overhaul replaces upper engine components (pistons, liners, rings, bearings, seals, gaskets) without removing the engine from the equipment. An out-of-frame (major) overhaul involves removing the engine and additionally inspecting or replacing the crankshaft, camshaft, cylinder block, and other lower-end components.
Piston and liner specifications vary by engine CPL, build date, and emissions tier. The engine dataplate provides the serial number and CPL code, which Cummins uses to identify the exact component specification. Using the wrong kit can result in incorrect compression ratio or piston-to-liner clearance.
