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Eccentric Shaft Position Sensor Replacement
 
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Pelican Technical Article:

Eccentric Shaft Position Sensor Replacement

Nick Czerula

Time:

6 hours6 hrs

Tab:

$300

Talent:

*****

Tools:

Set of sockets, Flathead screwdriver

Applicable Models:

BMW 525i/xi Sedan (2004-07)
BMW 528i/xi Sedan (2008-10)
BMW 530i/xi Sedan (2004-07)
BMW 530xi Wagon (2006-07)
BMW 535i/xi Sedan (2008-10)
BMW 535xi Wagon (2008)

Parts Required:

Eccentric shaft sensor, eccentric shaft sensor seal, valve cover gasket, electrical terminal spray cleaner

Hot Tip:

Work with a cool engine.

Performance Gain:

Remedy oil leaks

Complementary Modification:

Replace valve cover gasket

The eccentric shaft position sensor is used as a feedback for the Valvetronic eccentric camshaft. The eccentric shaft is actuated by the Valvetronic motor and in return controls variable intake valve lift. The eccentric shaft sensor is mounted to the cylinder head beneath the valve cover. The top of the sensor protrudes up through valve cover and is sealed by a rubber gasket. The eccentric shaft sensor tends to wick engine oil up through electrical connector, creating an oil leak at top front of valve cover. If you suspect your sensor is leaking, follow these steps to inspect and replace it. This is a time consuming repair, so plan a day for it and have everything you need on hand before you begin.

Remove engine covers. See our tech article on engine cover removing.

6-cylinder engine:
6-cylinder engine: Unplug the eccentric shaft sensor electrical connector by detaching locking tabs (green arrow) with a small flathead screwdriver and pulling up and out of sensor.
Figure 1

6-cylinder engine: Unplug the eccentric shaft sensor electrical connector by detaching locking tabs (green arrow) with a small flathead screwdriver and pulling up and out of sensor.

6-cylinder engine: Inspect sensor and electrical connector for signs of engine oil.
Figure 2

6-cylinder engine: Inspect sensor and electrical connector for signs of engine oil. If any is found, replace eccentric shaft sensor, eccentric shaft sensor seal and clean electrical connector with terminal cleaner (green arrows).

6-cylinder engine: Remove valve cover.
Figure 3

6-cylinder engine: Remove valve cover. See our tech article on valve cover replacing. Once valve cover has been removed, you will have to remove the eccentric shaft sensor fasteners (green arrows). The top fasteners you'll want to remove using an open end 10mm wrench. The lower fastener is accessed through a hole in timing chain guide, use a 10mm socket to remove it. When removing the fasteners, loosen each one a few turns at a time. The fasteners are captured on the sensor and doing it this way will avoid one coming free and possibly falling into engine.

6-cylinder engine: Once all fasteners are loose, remove sensor from engine.
Figure 4

6-cylinder engine: Once all fasteners are loose, remove sensor from engine. Note how fasteners (green arrows) stay attached to sensor when removing. Install new sensor and evenly tighten each fastener a few turns at a time until they are bottomed out, then torque. Be very careful not to cross-thread any of them.

6-cylinder engine: Once new sensor is installed remove eccentric shaft sensor seal (green arrow) from valve cover.
Figure 5

6-cylinder engine: Once new sensor is installed remove eccentric shaft sensor seal (green arrow) from valve cover. Gently lever seal out of valve cover using a flathead screwdriver. Do not install new seal yet. Leaving out while installing valve cover makes installation easier. Reinstall valve cover. See our tech article on valve cover replacing.

6-cylinder engine: With valve cover installed, press new eccentric shaft seal into valve cover.
Figure 6

6-cylinder engine: With valve cover installed, press new eccentric shaft seal into valve cover. I like to use a socket to press seal into valve cover. A 30mm socket should work, depending on brand of socket, you may need something larger or smaller.

6-cylinder engine: This photo shows eccentric shaft seal installed properly (green arrow).
Figure 7

6-cylinder engine: This photo shows eccentric shaft seal installed properly (green arrow). Now that the eccentric shaft sensor replacement procedure is complete, you will have to assemble remaining valve cover items. See our tech article on valve cover replacing.

8-cylinder engine:
8-cylinder engine: 8-cylinder engine eccentric shaft sensors (yellow arrow) are mounted in the rear of the valve cover, next to the camshaft position sensors (green arrow).
Figure 8

8-cylinder engine: 8-cylinder engine eccentric shaft sensors (yellow arrow) are mounted in the rear of the valve cover, next to the camshaft position sensors (green arrow). To replace the seal on the valve cover, remove both E8 external Torx fasteners (red arrows), then remove the seal and replace with new. To replace the sensor, remove the valve cover. Once the valve cover is removed, remove the three T25 Torx fasteners for the eccentric shaft sensor. The fasteners face toward the firewall and are visible once the valve cover is removed. These are much easier to get to than the 6-cylinder version. Once removed, replace with new and reseal valve cover.

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Page last updated: Fri 12/9/2016 02:41:42 AM