Oil Spray Nozzles; Oil Pressure; Oil Level; Oil Return - BMW N55 Manual

Oil Spray Nozzles

The N55 engine is equipped with oil spray nozzles for the purpose of cooling the piston
crown. A special tool is required for positioning the oil spray nozzles.

Oil Pressure

Since the N55 engine has an oil pump with electronic volumetric flow control, it is neces-
sary to measure the oil pressure precisely. For this reason, a new oil pressure sensor is
installed.
Advantages of the new oil pressure sensor:
• It now measures absolute pressure (previous measured relative pressure).
• It is characteristic map control in all speed ranges.

Oil Level

The oil quality sensor is used for measuring the oil level as on previous BMW engines.

Oil Return

The following graphics show the integrated oil deflector. It combines the following
components:
• Oil deflector (4)
• Intake snorkel (5)
The oil sump (1) and crankshaft are separated by the integrated oil deflector. Oil scraper
edges are installed on the bedplate to direct the spray oil from the crankshaft.
Depending on the model, the oil pan can be adapted to different installation configura-
tions by simply changing the intake snorkel. The oil, flowing back from the cylinder head
(2, 6) is directed under the oil deflector. In this way, even under high transverse accelera-
tion conditions, no returning oil can reach the crankshaft and cause churning losses .
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N55 Engine