2.0L Engine - Service Information: Maintenance Jeep Compass I

ENGINE LUBRICATION SYSTEM

Engine oil is drawn up through the pickup tube and is pressurized by the oil pump and routed through the full-flow filter to the main oil gallery running the length of the cylinder block. A diagonal hole in each bulkhead feeds oil to each main bearing. Drilled passages within the crankshaft route oil from main bearing journals to connecting rod journals. Balance shaft lubrication is provided through an internal oil passage at the #3 bearing location around the BSM mounting bolt. A vertical hole at the number one bulkhead routes pressurized oil through a filter screen and head gasket up to the cylinder head. The oil then divides into three passages; one to the intake cam phaser, one to the exhaust cam phaser and one to the camshafts. The passage to the camshafts divides to feed both of the hollow camshafts at the second cam journal. The rest of cam journals are feed oil through the hollow camshafts. The #1 cam journals are fed oil through the VVT oil passages. Oil passages to the phasers are directed through the OCV (oil control valves) to the #1 journals. The oil then flows through the camshafts then to the cam phasers. Oil returning to the pan from pressurized components supplies lubrication to the valve stems, cam lobes, and tappets. Cylinder bores and wrist pins are splash lubricated from directed slots on the connecting rod thrust collars.

Scheme 55

Note. Anytime the oil temperature sensor is removed, it should be replaced with a new sensor.

Scheme 56

Scheme 57

1. Disconnect and remove oil temperature sensor (1). CAUTION: Threads in cylinder head are British Standard Pipe (BSP). Do not install a NPT threaded adapter, this could crack the cylinder block.
2. Install threaded adapter 9879 (1).
3. Install oil pressure gauge (2).
4. Start engine and record reading on oil pressure gauge (1). CAUTION: If oil pressure is 0 at idle, do not perform the 3000 RPM test
5. If oil pressure is 0 at idle, shut off engine. Check for pressure relief valve stuck open, a clogged oil pick-up screen.
6. Remove oil pan and inspect for debris. See «REMOVAL»(ref-304329-S23187716552008110700000) .
7. Remove oil pressure relief valve. See «REMOVAL»(ref-304329-S13142227132008110700000)
8. Inspect oil pressure relief valve. See «INSPECTION»(ref-304329-S01462716742008110700000) . If damaged, replace valve.
9. If pressure relief valve is okay, replace balance shaft module assembly. See «REMOVAL»(ref-304329-S24666377072008110700000) .
10. After test is complete, remove oil pressure gauge (2) and adapter 9879 (1).
11. Install a new oil pressure temperature sensor (1) and connect electrical connector.