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M62 8-Cylinder Starter Replacement
 
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Pelican Technical Article:

M62 8-Cylinder Starter Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$250

Talent:

*****

Tools:

10mm sockets, E12, E14 sockets external Torx, universal adapter, 13mm wrench, floor jack, jack stands, wheel chocks, safety glasses, torque wrench

Applicable Models:

BMW X5 (2000-06)

Parts Required:

Starter motor

Hot Tip:

Work with a cool engine

Performance Gain:

Reliable and working starter

Complementary Modification:

Replace battery

The starter motor is an electric motor powered by the battery, commanded on when the driver rotates the key to start the engine. The modern BMW starter motor is a permanent magnet direct current electric motor with a solenoid mounted on it. When current from the vehicle battery is applied to the solenoid, the solenoid engages a lever that pushes out the drive pinion on the starter driveshaft and meshes the pinion with the starter ring gear on the flywheel of the engine.

The solenoid closes the high-current contacts for the starter motor. The starter motor then turns the engine. Once the engine starts, a spring in the solenoid assembly pulls the pinion gear away from the ring gear, and the starter motor stops.

When a starter motor fails your engine will not start. You may turn the key and attempt to crank the engine but nothing happens or perhaps you might hear a few clicks from the worn out starter. It is important to be sure your battery is fully charged and in good condition and that the battery terminals, positive connections and ground cables are tight and corrosion-free before condemning your starter.

Another cause of a no-start condition could be failure of the electronic immobilizer system. If the ignition key does not communicate with the immobilizer or one of the electronic modules responsible for granting access to the starting system fails, you may have a situation which mimics a failed starter. To test the starter itself, you need to make sure that full battery current is available at the main starter terminal (B+) and that battery current is switched on at the small starter terminal when the ignition switch is engaged. If electrical current is not available at either of those terminals the no-start condition is caused by an electrical or electronic failure and not necessarily by the starter motor.

The engine starter motor is located on the right side of the engine below the exhaust manifold. It is not the easiest part to access on your BMW E53 X5 with an M62 8-cylinder engine.

Remember that your car may have been serviced before and had parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Jack up the front of your vehicle. See our article on jacking your vehicle.

Remove the engine splash shield and reinforcement plate. See our tech article on splash shield removing.

Disconnect the negative (-) battery cable. See our tech article on battery replacing.

The engine starter motor (red arrow) is located on the right side of the engine below the exhaust manifold.
Figure 1

The engine starter motor (red arrow) is located on the right side of the engine below the exhaust manifold. It is not the easiest part to access on your BMW E53 X5 with an M62 8cylinder engine.

Start by removing the starter heat shield.
Figure 2

Start by removing the starter heat shield. Remove the three 10mm fasteners (red arrows).

Then remove the heat shield (red arrow).
Figure 3

Then remove the heat shield (red arrow). Feed the forward facing part of the shield down and remove it.

Working at the back of the starter, remove the 13mm battery positive (B+) cable nut (red arrow).
Figure 4

Working at the back of the starter, remove the 13mm battery positive (B+) cable nut (red arrow).

Next, the starter leads have to be disconnected.
Figure 5

Next, the starter leads have to be disconnected. Located just behind the starter (red arrow) is the electrical connector for the starter leads. Start by cutting the zip tie (green arrow) to detach the harness. Then rotate the electrical connector (blue arrow) 45 degrees to detach it from the mounting bracket (yellow arrow). Then, disconnect the electrical connector by squeezing the release tabs and pulling it apart.

Then pull the large cable off (green arrow) the stud (red arrow).
Figure 6

Then pull the large cable off (green arrow) the stud (red arrow).

Next you will remove the starter fasteners (green arrows).
Figure 7

Next you will remove the starter fasteners (green arrows). The fasteners are E12 external Torx. Use a long extension with a swivel adapter (red arrow). Locate the upper fastener. Use the bulge in the bell housing (yellow arrow) to locate the top of the starter. Then remove the upper fastener.

Use a long extension with a swivel adapter (red arrow) to remove the lower starter fastener.
Figure 8

Use a long extension with a swivel adapter (red arrow) to remove the lower starter fastener.

Now you can remove the starter from the engine.
Figure 9

Now you can remove the starter from the engine. Just pull it out of the engine toward the front of the vehicle. Wiggle it if it is stuck. They usually come right out with no problem. Angle the rear of the starter motor down and remove it from the engine (red arrow).

If your new starter doesn't come with the starter lead harness (red arrow), remove the fasteners (yellow arrows) and transfer it over.
Figure 10

If your new starter doesn't come with the starter lead harness (red arrow), remove the fasteners (yellow arrows) and transfer it over. Fastener sizes will vary from 6mm to 10mm. Reinstall start into bell housing. Install the electrical connections. Do not over-tighten the battery positive (+) terminal or the starter lead, as the studs can break. Reconnect the battery. Check the operation of the starter. Then recheck that all wiring is routed as before.


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Page last updated: Wed 12/7/2016 02:48:41 AM