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Author Topic: TDI help please.  (Read 4787 times)

Offline Dannyboy88

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Re: TDI help please.
« Reply #15 on: January 24, 2013, 02:31:43 pm »
Ok mine doesnt really make a noise or anything but just with the engine being jerky on shut off its pointing me towards the ASV, ill get my friend with VCDS to scan it at the weekend and all also do afew tests on it, just been quoted £107 for a pierburg ASV from my friends work.

Offline skard

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Re: TDI help please.
« Reply #16 on: January 24, 2013, 02:34:59 pm »
It takes a few minutes to check if it's sticking, I doubt a scan would point to it as electrically it'll be fine...prise off the clip, remove hose, have a friend start/stop the engine and keep an eye out, might need a small mirror for visibility.
Used to have Edition 30 - number 009 and a GT TDI 140.
Now have an S4 B8 Avant (stage 2)

Offline Dannyboy88

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Re: TDI help please.
« Reply #17 on: January 24, 2013, 07:15:17 pm »
Ok thanks Skard, ill let you know my findings, whilst I'm under the bonnet I'm going to change the alternator tensioner and belt.

Offline skard

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Re: TDI help please.
« Reply #18 on: January 24, 2013, 07:18:16 pm »
You might find it's your alternator clutch pulley that's making it sound a but rickety, if either of those changes make no improvement on the noise.
Used to have Edition 30 - number 009 and a GT TDI 140.
Now have an S4 B8 Avant (stage 2)

Offline Matto

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Re: TDI help please.
« Reply #19 on: January 24, 2013, 07:38:59 pm »
Just a question about the tensioner, does if flap about like its lost its tension?

Offline Dannyboy88

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Re: TDI help please.
« Reply #20 on: January 24, 2013, 08:05:43 pm »
There is movement in the tensioner but nothing out of the world the belt still looks tight, I just thought the noise sounded like it could be the tensioner or am I wrong?  :laugh: lol

Offline Matto

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Re: TDI help please.
« Reply #21 on: January 24, 2013, 09:19:19 pm »
Yes it could still be the tensioner but when I went down a similar route with my mk4 (tensioner was flapping about, especially with the engine under load like when on full lock for example) I replaced the tensioner thinking it was that. Changed it and all was good for about a day haha. So did some research which pointed to the alternator pulley. They have a freewheel clutch mechanism in them, which dampens the ocillations of the engine. When these seize up, it causes the tensioner to waggle as the belt is speeding up and slowing down (exaggerated).

You can test by taking the tension off the belt, slide an Allen key or small screwdriver through the hole in the tensioner which holds it back, slip the belt off the alternator pulley, then with your hand spin the pulley without letting go and jerk it back the opposite way. You should be able to make it freewheel. I suggest wearing gloves if you do try it so the ribs on the pulley don't slice your hand if it spins.

Offline skard

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Re: TDI help please.
« Reply #22 on: January 24, 2013, 09:28:05 pm »
Agree the alternator pulley can give a false reading of a failing tensioner.

Had a tickover rumble on two previous diesels because of this.

If you're changing it, a tool like http://www.ebay.co.uk/itm/Laser-3307-Alternator-Tool-M10-Spline-1-2-D-/280964948511?pt=UK_Hand_Tools_Equipment&hash=item416ad0e21f will be handy
Used to have Edition 30 - number 009 and a GT TDI 140.
Now have an S4 B8 Avant (stage 2)

Offline A1dan2.0tdisport

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Re: TDI help please.
« Reply #23 on: January 26, 2013, 10:51:48 am »
Usefull info there chaps. I'm going to take my asv off and have a spring clean me thinks.