A8 Parts Forum  

Go Back   A8 Parts Forum > A8 D2 > D2 - Engine Bay

D2 - Engine Bay Everything under the bonnet

Reply
 
Thread Tools Display Modes
  #1  
Old 12th June 2022, 05:54 PM
Audifan Audifan is offline
Senior Member
 
Join Date: Feb 2020
Location: America
Posts: 388
Default 40v toothed belt lose tension?

What would cause the toothed belt to lose its tension where the 2 idler pulleys are?
__________________
2001 S8 (build date March 16th 2001) Brilliant black with oxblood red/black interior.
Mods prior to my ownership: 01E 6 speed, carbon fiber trim, bi-xenon, aftermarket muffler with x-pipe, tinted windows, non-tip steering wheel, Spal electric fan.

My mods: Oxblood red interior, LED interior lights, D3 ignition coils, new window tint, tip steering wheel with new S8 emblem, mk1 TT steering wheel air bag, mk1 TT 6 speed shift knob, new shift boot.
Reply With Quote
  #2  
Old 12th June 2022, 06:37 PM
Ronin Ronin is offline
Banned
 
Join Date: Jul 2019
Location: Wales
Posts: 847
Default

A bad tensioner?
Reply With Quote
  #3  
Old 12th June 2022, 09:15 PM
MikkiJayne MikkiJayne is offline
Senior Member
 
Join Date: Jan 2012
Posts: 5,017
Default

The 40V does that. Depending on where it stops when you turn it off, the crank can bounce backwards from the compression of the next cylinder to fire. When the crank goes backwards, it loosens off the tension on the belt. As soon as you start it again, the belt tightens up and its all fine.
Reply With Quote
  #4  
Old 12th June 2022, 10:02 PM
Audifan Audifan is offline
Senior Member
 
Join Date: Feb 2020
Location: America
Posts: 388
Default

Interesting..... I did not know that. So no worries then?
__________________
2001 S8 (build date March 16th 2001) Brilliant black with oxblood red/black interior.
Mods prior to my ownership: 01E 6 speed, carbon fiber trim, bi-xenon, aftermarket muffler with x-pipe, tinted windows, non-tip steering wheel, Spal electric fan.

My mods: Oxblood red interior, LED interior lights, D3 ignition coils, new window tint, tip steering wheel with new S8 emblem, mk1 TT steering wheel air bag, mk1 TT 6 speed shift knob, new shift boot.
Reply With Quote
  #5  
Old 13th June 2022, 08:49 PM
Audifan Audifan is offline
Senior Member
 
Join Date: Feb 2020
Location: America
Posts: 388
Default

The reason why I ask, I had a buddy come to help guide me with getting the engine to TDC and mark everything before taking the timing belt off. I took of the toothed belt covers and he noticed there is a fair amount of slack which is reason why I didn't do anything else after taking the timing belt covers as there was some concern with the slack. Which is why I asked.
__________________
2001 S8 (build date March 16th 2001) Brilliant black with oxblood red/black interior.
Mods prior to my ownership: 01E 6 speed, carbon fiber trim, bi-xenon, aftermarket muffler with x-pipe, tinted windows, non-tip steering wheel, Spal electric fan.

My mods: Oxblood red interior, LED interior lights, D3 ignition coils, new window tint, tip steering wheel with new S8 emblem, mk1 TT steering wheel air bag, mk1 TT 6 speed shift knob, new shift boot.
Reply With Quote
Reply

Thread 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 Off

Forum Jump


All times are GMT. The time now is 11:15 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.