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D2 - Engine Bay Everything under the bonnet

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Old 12th June 2022, 04:54 PM
Audifan Audifan is offline
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Default 40v toothed belt lose tension?

What would cause the toothed belt to lose its tension where the 2 idler pulleys are?
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2001 S8 (build date March 16th 2001) Brilliant black with black interior and Recaro seats.
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: 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.
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Old 12th June 2022, 05:37 PM
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Ronin Ronin is offline
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A bad tensioner?
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Old 12th June 2022, 08:15 PM
MikkiJayne MikkiJayne is offline
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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.
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Old 12th June 2022, 09:02 PM
Audifan Audifan is offline
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Interesting..... I did not know that. So no worries then?
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2001 S8 (build date March 16th 2001) Brilliant black with black interior and Recaro seats.
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: 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.
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Old 13th June 2022, 07:49 PM
Audifan Audifan is offline
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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.
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2001 S8 (build date March 16th 2001) Brilliant black with black interior and Recaro seats.
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: 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
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