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Crankshaft Pulley Replacement
 
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Pelican Technical Article:

Crankshaft Pulley Replacement

Nick Czerula

Time:

1.5 hours

Tab:

$150

Talent:

****

Tools:

13mm socket

Applicable Models:

BMW Z4 Coupe (2006)

Parts Required:

Crankshaft pulley, pulley bolts

Hot Tip:

Work with a cool engine

Performance Gain:

Proper belt drive function

Complementary Modification:

Install lightweight pulley

The crankshaft pulley is used to drive the engine drive belts. The harmonic balancer is mounted behind. It is a solid steel disc balanced at the factory.

People tend to swap out the harmonic balancer and replace it with either a lighter or different sized pulley. While this does work to free up power from the engine, it often comes at the expense of engine vibrations. If you want to use a lighter, different sized pulley, be sure to use a good quality unit. Cheaper versions can cause vibrations.

In this article I will describe how to replace the crankshaft pulley (harmonic balancer) on BMW Z4M models. Additionally, see our tech article on crankshaft seal replacing.

Keep in mind that when your car was serviced before, parts may have been 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 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. Do not work on your vehicle if you feel the task is beyond your ability.

Vehicle models change and evolve as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Lift and support your vehicle. See our tech article on jacking up your Z4.

Remove the engine splash shields. See our tech article on engine splash shield replacing.

The crankshaft pulley is mounted to the front of the engine (red arrow).
Figure 1

The crankshaft pulley is mounted to the front of the engine (red arrow). To replace it, you will have to remove the drive belts (purple arrows). See our tech article on drive belts replacing.

Start by removing the six 13mm fasteners (red arrows).
Figure 2

Start by removing the six 13mm fasteners (red arrows). These should come right out as they are not tightened under high torque.

You will have to use a chrome socket, impact sockets won't fit into the pulley well.
Figure 3

You will have to use a chrome socket, impact sockets won't fit into the pulley well.

Once the fasteners are removed, remove the center sheet metal nut (red arrow).
Figure 4

Once the fasteners are removed, remove the center sheet metal nut (red arrow). It will pull right off, as it is mounted to the pulley using the 13mm fasteners previously removed.

Then, remove the pulley (red arrow) from the pulley hub (purple arrow).
Figure 5

Then, remove the pulley (red arrow) from the pulley hub (purple arrow). If stuck, use a soft-faced hammer and lightly tap the perimeter of the pulley to free it. Remove the pulley from the hub. Clean hub using emery cloth, then reverse steps to install the new pulley.

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Page last updated: Fri 12/9/2016 03:01:34 AM