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M54 6-Cylinder Engine Drive Belt Tensioners Replacement
 
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Pelican Technical Article:

M54 6-Cylinder Engine Drive Belt Tensioners Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$150

Talent:

****

Tools:

Set of sockets, wrenches, screwdrivers

Applicable Models:

BMW X3 Sport Utility (2004-06)

Parts Required:

Drive belt tensioners, bearings, hydraulic tensioner

Hot Tip:

Work with a cool engine.

Performance Gain:

Proper engine accessory operation

Complementary Modification:

Replace drive belts

In this article, I'll go over the steps involved with replacing the drive belt tensioners on BMW X3 models with an M54 6-cylinder engine. Be sure to work with a cool engine and remove the key from the ignition.

Drive belt tensioners and idler pulley can fail when you least expect it. There are a few warning signs; listen for increasing belt noise, chirping or grinding from the belt area. If you have any of these symptoms, remove your drive belts and inspect the idler and tensioners. Also inspect the main drive belt tensioner for straightness, as the bearing wears and it can tilt, causing your drive belt to fail. With your engine cold and turned OFF, inspect your drive belts for wear. The belts should be free from cracks, fraying, glazing and missing chunks.

BMW X3 models equipped with an M54 6-cylinder engine utilize 2 multi-rib engine drive belts.
Figure 1

BMW X3 models equipped with an M54 6-cylinder engine utilize 2 multi-rib engine drive belts. A small outer belt drives the A/C compressor and the larger inner belt drives the alternator, coolant pump, and power steering pump. Start by removing both drive belts. See our tech article on drive belt M54 engine replacing.

This photo shows the tensioners and idler from above.
Figure 2

This photo shows the tensioners and idler from above. A/C belt tensioner indicated by blue arrow. Accessory (main) drive belt tensioner indicated by yellow arrow. Idler pulley indicated by red arrow.

Idler: Locate the accessory drive belt idler pulley and remove the dust cap (blue arrow) using a flathead screwdriver (red arrow).
Figure 3

Idler: Locate the accessory drive belt idler pulley and remove the dust cap (blue arrow) using a flathead screwdriver (red arrow).

Idler: Then remove the T45 Torx idler pulley (red arrow) bolt.
Figure 4

Idler: Then remove the T45 Torx idler pulley (red arrow) bolt.

Idler: Remove the bolt and the idler pulley together (red arrow) once the bolt has been loosened.
Figure 5

Idler: Remove the bolt and the idler pulley together (red arrow) once the bolt has been loosened. If replacing idler, transfer bolt and bushing over to new idler (blue arrows). Reverse steps to install new idler. Once belt is installed, start engine and allow to run for less than 30 seconds, shut engine OFF and recheck belt installation.

Accessory belt tensioner: Using a 16mm socket, relieve tension then remove the pin (red arrow) used to hold tensioner in place when belt is removed.
Figure 6

Accessory belt tensioner: Using a 16mm socket, relieve tension then remove the pin (red arrow) used to hold tensioner in place when belt is removed. If you did not install a pin when removing belt, skip this step.

Accessory belt tensioner: Using a 13mm socket, remove the two tensioner fasteners (red arrows).
Figure 7

Accessory belt tensioner: Using a 13mm socket, remove the two tensioner fasteners (red arrows).

Accessory belt tensioner: Remove the tensioner from the engine.
Figure 8

Accessory belt tensioner: Remove the tensioner from the engine. Reverse steps to install new tensioner. Once belt is installed, start engine and allow to run for less than 30 seconds, shut engine OFF and recheck belt installation.

A/C belt tensioner: Using a 16mm socket, remove the center tensioner mounting bolt.
Figure 9

A/C belt tensioner: Using a 16mm socket, remove the center tensioner mounting bolt.

A/C belt tensioner: Once removed (red arrow), remove tensioner with bolt from engine (blue arrow).
Figure 10

A/C belt tensioner: Once removed (red arrow), remove tensioner with bolt from engine (blue arrow). When installing new tensioner, be sure to properly align installation tabs with slots on engine (yellow arrow). Reverse steps to install new tensioner. Once belt is installed, start engine and allow to run for less than 30 seconds, shut engine OFF and recheck belt installation.

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Page last updated: Wed 3/22/2017 03:10:37 AM