Caterpillar 3512B Marine Engine Spares

The Caterpillar 3512B is a 12-cylinder, vee-configuration medium-speed diesel used for offshore workboat propulsion and marine generator sets, where it runs demanding duty cycles that drive a steady spare-part requirement. The engine is part of the 3500 series and shares its parts architecture with the 3516 and related models. The highest-frequency wear items are the electronic unit injector, the turbocharger cartridge, the cylinder head seal group and the water pump seal group, with the crankshaft viscous damper checked at major overhauls. Caterpillar identifies these by part group, and two configuration disciplines matter most: a replacement electronic unit injector requires its trim code to be uploaded to the engine control module so that cylinder fuelling stays synchronised, and a turbocharger cartridge is a high-speed rotating assembly that must arrive with a dynamic balancing certificate. Cylinder head gaskets must be the correct multi-layer steel build with fire rings for the engine's peak combustion pressure, and the water pump seal must use carbon-ceramic faces suited to saltwater service. This series page lists the curated, part-group-anchored 3512B spares that make up a routine overhaul, each carrying its identifier so an engineer can confirm fitment and configuration before requesting a quote.