Oil System Flow Diagram

Oil Flow Path

The 944 uses a pressurised, wet-sump lubrication system. Oil flows along the following path:

1. Oil pan — oil collects in the pan at the bottom of the engine.
2. Pickup tube and screen — the oil pump draws oil up through a pickup tube whose screen keeps debris out of the system.
3. Oil pump — mounted at the front of the engine and driven from the crankshaft, the pump pressurises the oil. See LUBE-07.
4. Pressure relief valve — regulates maximum system pressure by bleeding excess oil back toward the sump. See LUBE-02 and LUBE-03.
5. Oil cooler — pressurised oil passes through the oil cooler, where engine coolant carries away heat. See LUBE-01.
6. Oil filter — oil is filtered before entering the main gallery. The oil pressure sender taps in near the filter. See LUBE-05.
7. Main oil gallery — filtered, cooled oil is distributed to the engine's lubrication points: the crankshaft main and connecting-rod bearings, the cylinder head (camshaft and valvetrain), and the balance shafts.
8. Return to the pan — oil drains back down through the engine to the pan, and the cycle repeats.

Note: The original Clark's Garage page presented this information as a single oil-system flow diagram. The diagram image was not preserved in the source archive; the flow path above was authored in text from the related lubrication procedures. Normal oil pressure values and troubleshooting are covered in LUBE-03.