Oil Catch Can PCV Routing Diagram - Block to Can to Intake Manifold Setup

This is a simple hand-drawn schematic diagram showing how to plumb an oil catch can into a vehicle's PCV (positive crankcase ventilation) system. The diagram depicts four elements: the engine block, the intake manifold (labeled "IM"), a catch can, and two valve locations marked with red rectangles. A hose is routed from the OEM PCV location on the engine block to the catch can, and a second hose runs from the catch can to the intake manifold. A check valve or PCV valve is shown inline on the hose between the catch can and the intake manifold, near the manifold connection. The document was uploaded to a 2008 Mazda 3 gallery as part of an album about oil catch cans and check valves. The diagram gives no year, make, model, part numbers, or dimensions — it is purely a conceptual routing illustration showing crankcase vapors flowing from the block, through the catch can (where oil vapor is separated), and then to the intake manifold, with a check valve preventing reverse flow. A reader can learn the correct hose routing order and valve placement for a basic catch can installation on the PCV side of the crankcase ventilation system.