Parts Catalog Accessories Catalog Tech Info Tech Forums
 
Follow Pelican Parts on Facebook Follow Pelican Parts on Twitter Follow Pelican Parts on Instagram Follow Pelican Parts on YouTube Follow Pelican Parts on Pinterest Follow Pelican Parts on Tumblr
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
 >  >
M62 8-Cylinder Drive Belt Tensioners Replacement
 
Bookmark and Share

Pelican Technical Article:

M62 8-Cylinder Drive Belt Tensioners Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$150

Talent:

****

Tools:

Set of sockets, wrenches, screwdrivers

Applicable Models:

BMW X5 Sport Utility (2000-06)

Parts Required:

Drive belt tensioners, pulleys, hydraulic tensioners

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 E53 models with the M62 8-cylinder engine. Be sure to work with a cool engine and remove the key from the ignition. The 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 bushings wear it can tilt, causing your drive belt to fail. If you have a chirping sound from your hydraulic tensioner, it could be a bad bushing in the tension strut. This can be remedied by replacing the drive belt hydraulic tension strut. 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.

Remove the engine splash shields, cooling fan and drive belts before beginning. See our tech articles for these procedures.

BMW E53 models equipped with the M62 8-cylinder engine utilize two multi-rib engine drive belts.
Figure 1

BMW E53 models equipped with the M62 8-cylinder engine utilize two multi-rib engine drive belts. A small inner belt drives the A/C compressor and the larger outer belt drives the alternator, coolant pump, and power steering pump. The A/C belt has a single tensioner pulley (yellow arrow) and one hydraulic tension strut (green arrow). The accessory drive belt has two tensioner pulleys (blue arrows) and one hydraulic tension strut (red arrow).

Accessory belt tensioner pulleys: To replace the pulleys, remove the T50 Torx fasteners (green arrows).
Figure 2

Accessory belt tensioner pulleys: To replace the pulleys, remove the T50 Torx fasteners (green arrows). Depending on the age and condition of the Torx fastener, I find a T45 Torx bit sometimes fits better usually due to corrosion build up in the fastener.

Accessory belt tensioner pulleys: If you are replacing one or both of the pulleys, remove the pulley with the fastener.
Figure 3

Accessory belt tensioner pulleys: If you are replacing one or both of the pulleys, remove the pulley with the fastener. Be sure not to misplace any of the pulley washers and note the order they are removed in. Install the new pulleys and tighten the fasteners.

Accessory belt tensioner: Remove the upper pulley fastener.
Figure 4

Accessory belt tensioner: Remove the upper pulley fastener. Remove the T50 Torx fastener (green arrow). Depending on the age and condition of the Torx fastener, I find a T45 Torx bit sometimes fits better,usually due to corrosion build up in the fastener.

Accessory belt tensioner: Once the fastener is removed the pulley can either be left on the tensioner for now or removed.
Figure 5

Accessory belt tensioner: Once the fastener is removed the pulley can either be left on the tensioner for now or removed. It is mounted on a post and will usually stay put during the removal process.

Accessory belt tensioner: Once the pulley fastener has been removed, remove the two 13mm tensioner mounting bolts (yellow arrows).
Figure 6

Accessory belt tensioner: Once the pulley fastener has been removed, remove the two 13mm tensioner mounting bolts (yellow arrows). The green arrow points to the mounting surface for the pulley you removed earlier.

Accessory belt tensioner: Remove the tensioner assembly from the engine.
Figure 7

Accessory belt tensioner: Remove the tensioner assembly from the engine.

Accessory belt tensioner: This photo shows the accessory drive belt tensioner components.
Figure 8

Accessory belt tensioner: This photo shows the accessory drive belt tensioner components. Blue arrows point to the pulleys. The green arrow points to a pulley washer. Red arrows point to the tensioner brackets and the yellow arrow points to the hydraulic tension strut. The serviceable components are the pulleys and the tension strut. Some BMW models allow rebuilding of the brackets and bushing, but not on the M62 engine.

Accessory belt tensioner: To replace the tension strut, remove both 13mm fasteners (green arrows).
Figure 9

Accessory belt tensioner: To replace the tension strut, remove both 13mm fasteners (green arrows). Place the tensioner in a vise to hold it while loosening. Install the new tension strut and tighten the fasteners. Be sure that the arrow on the strut is pointing up when installing it (red arrow). Tighten 8.8 grade bolts to 22 Nm (16 ft-lb) and 10.9 grade bolts to 30 Nm (22 ft-lb).

A/C belt tensioner: To replace the pulley, remove the T50 Torx fastener (yellow arrow).
Figure 10

A/C belt tensioner: To replace the pulley, remove the T50 Torx fastener (yellow arrow). Depending on the age and condition of the Torx fastener, I find a T45 Torx bit sometimes fits better usually due to corrosion build up in the fastener. If you're removing the entire tensioner, remove the 13mm tensioner fastener (green arrow).

A/C belt tensioner: Then remove the two 13mm tensioner fasteners (green arrows).
Figure 11

A/C belt tensioner: Then remove the two 13mm tensioner fasteners (green arrows).

A/C belt tensioner: Once the fasteners are removed, remove the tensioner from the engine.
Figure 12

A/C belt tensioner: Once the fasteners are removed, remove the tensioner from the engine.

A/C belt tensioner: To replace the tension strut, remove both 13mm fasteners (green arrows).
Figure 13

A/C belt tensioner: To replace the tension strut, remove both 13mm fasteners (green arrows). Place the tensioner in vise to hold it while loosening.

A/C belt tensioner: Remove the tension strut from the tensioner brackets.
Figure 14

A/C belt tensioner: Remove the tension strut from the tensioner brackets. Install the new tension strut and tighten the fasteners. Be sure that the arrow on the strut is pointing up when installing it (red arrow). Tighten 8.8 grade bolts to 22 Nm (16 ft-lb) and 10.9 grade bolts to 30 Nm (22 ft-lb).

Bookmark and Share

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Privacy Statement]
 [Contact Us] [About Us] [Shipping] [Map to our Location] [Careers]

Copyright © Pelican Parts Inc.

Page last updated: Mon 12/5/2016 02:23:38 AM