318ti.org forum

Go Back   318ti.org forum > Technical, Maintenance and Modifications > Knowledge Base

Notices

Knowledge Base How to articles and things explained.

.
» Recent Threads
1.9 drivetrain for sale...
Today 03:59 AM
Last post by qccabrio
Today 03:59 AM
0 Comments, 44 Views
New to forum...new to...
06-25-2017 12:11 PM
Last post by J!m
Today 01:54 AM
3 Comments, 236 Views
Fs: 96 ti s50 swap
10-17-2016 07:19 PM
Last post by BMW_Hatchback
Today 01:41 AM
10 Comments, 4,742 Views
Central locking remote...
Yesterday 10:19 PM
Last post by DGWGuitars
Yesterday 10:19 PM
0 Comments, 69 Views
Black Armrest for...
06-22-2017 08:22 PM
Last post by youngnikolai
Yesterday 07:59 PM
2 Comments, 230 Views
The 318ti OBD-II engine...
10-19-2006 06:48 PM
Last post by J!m
Yesterday 03:32 PM
57 Comments, 32,217 Views
97 318ti No Crank No...
06-27-2014 04:25 AM
Last post by manson_magot
Yesterday 11:38 AM
24 Comments, 11,542 Views
Another Swapped Ti
11-19-2016 06:43 PM
Last post by ZEK
Yesterday 03:54 AM
24 Comments, 6,670 Views
3.42 diff for auto?
06-26-2017 01:15 AM
Last post by J!m
Yesterday 02:18 AM
3 Comments, 251 Views
List of People Who Live...
07-02-2007 04:28 AM
Last post by cobaltbloo
06-26-2017 03:31 PM
70 Comments, 21,174 Views
Comment Share/Bookmark
 
Tutorial Tools Display Modes
Idler Pulley and Tensioner Pulley Replacement - M44
Idler Pulley and Tensioner Pulley Replacement - M44
Published by paul somlo
09-01-2016
Default Idler Pulley and Tensioner Pulley Replacement - M44

This info applies to the M44 engine with the mechanical (spring loaded) belt tensioner. Both pulleys, in this case, have the plastic protective center cap and are fastened with hex head bolts. I know there are other configurations, as in hydraulic tensioner and varying fasteners that hold the pulleys. Maybe someone else can fill in the blanks.

The idler pulley is straightforward - the bolt that holds it is standard RH (right hand) thread and requires a 16mm socket.

THE TENSIONER PULLEY HAS A TWIST - THE BOLT IS LH (LEFT HAND) THREAD, ALSO REQUIRING A 16MM SOCKET

The tensioner bolt was made LH thread, so as not to loosen during belt changes. Since the tensioner has a fairly large range, it makes tightening the pulley bolt somewhat of a challenge. I think this is why the factory chose to use red threadlocker. And because of the threadlocker, removal of the bolt can cause confusion, as even when loosening, there will be a fair amount of torque involved. When I replaced the pulley, I cleaned up the threads and followed the factory's lead of using red threadlocker as well. A long, fine tooth ratchet helps when torquing the bolt.

I noticed that there's lots of speculation out there as to what "hand" the tensioner bolt is. Hopefully, this will save someone from shearing off a bolt head and making a lot more work. And if your assembly differs, you may be able to confirm the hand of the pulley bolt just by inspection, as the bolt may protrude through the mounting boss on the tensioner, being visible on the backside with a flashlight.

I'll include a photo of the pulley and a photo showing the LH threads. By the way, both pulleys are available as PN 11281748131, pricing as of this post roughly $15 each.
Tutorial Tools

  #1  
By paul somlo on 09-01-2016, 06:36 AM
Default

Are the two pictures visible to anyone else? I've attached them and they show in the preview as thumbnails, but I can't see them.
Reply With Quote
  #2  
By bluoval6 on 09-01-2016, 10:59 PM
Default

I don't see them either.
Reply With Quote
  #3  
By paul somlo on 09-03-2016, 01:02 AM
Default

Here are the pictures that go along with the 1st post - for some reason, they're not visible up above.
Attached Images
File Type: jpg P8311727.JPG (84.0 KB, 19 views)
File Type: jpg P8311726.JPG (85.6 KB, 17 views)
Reply With Quote
Comment

Bookmarks


Currently Active Users Viewing This Tutorial: 1 (0 members and 1 guests)
 
Tutorial Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Similar Threads
Tutorial Tutorial Starter Category Comments Last Post
m44 engine idler pulley performanceisland Engine 12 04-25-2015 11:10 PM
belt tensioner replacement question toveycom Engine 6 10-13-2013 05:48 PM
WTB Idler pulley 98318ti US and North America 3 06-03-2013 06:37 PM
M42 adjusting pulley help after tensioner change PHL Engine 0 05-06-2012 11:50 PM
Problems with idler pulley mohaughn Maintenance 0 04-07-2009 04:53 PM


All times are GMT +1. The time now is 09:59 AM.


.
Powered by site supporters
vBulletin Version 3.8.8
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright ©1999 - 2017, 318ti.org

Tutorial powered by GARS 2.1.8m ©2005-2006
© vBadvanced CMPS v3.2.2
[page compression: 70.18 k/85.33 k (17.76%)]

318ti.org does not warrant or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information or products discussed.