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| D2 - Transmission Gearboxes, diffs, drive shafts. |
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#1
9th March 2014, 02:35 PM
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Torque converter clutch stuck.
I've been noticing a clunk when engaging drive or reverse. This clunk is usually preceded by a slight pause then clunk. I did a scan with VCDS and it is showing the torque converter clutch is stuck in the off position. It started doing this a couple of months ago so I had the fluid changed and cleared the codes but it made no real difference. The clunk is still there and the same fault code has come back. Is there a way of unsticking the clutch without the need for a transmission stripdown? If I go to any specialist in Dubai as sure as God made little apples they will recommend a complete rebuild.
Thanks Steve
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2001 D2 S8. Volcano black. KW Variant 1 coilovers. EBC Turbo grooved discs with Yellow Stuff pads. 19 inch R8 replica wheels with 255/35/19 Michelin Super Sport. In the UK, 1990 Audi 90 2.3 20v Quattro with just 65,000 on the clock and in mint condition. 
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#2
9th March 2014, 02:37 PM
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By the way, I am assuming that this clunk is due to the converter clutch being stuck. If they are two separate problems, what are they?
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2001 D2 S8. Volcano black. KW Variant 1 coilovers. EBC Turbo grooved discs with Yellow Stuff pads. 19 inch R8 replica wheels with 255/35/19 Michelin Super Sport. In the UK, 1990 Audi 90 2.3 20v Quattro with just 65,000 on the clock and in mint condition.
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#3
10th March 2014, 12:16 PM
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The torque converter is a welded assembly and the lock-up clutch is captive inside this welded assembly.
 LUC piston shown in green, friction plate in red  Piston  Friction plate The torque converter can be replaced without opening up the transmission but the transmission assembly has to be removed from the vehicle to provide access. The torque converter simply slides off its splines and no specialist transmission knowledge is required to replace it – any competent mechanic should be able to manage it. The only tricky bit is ensuring that the oil pump drive dogs are engaged when it is replaced. The lock-up clutch is fully engaged in the higher gears only to reduce the slip across the torque converter (to save fuel). It is not engaged in 1st or Reverse so I can’t see why it would contribute to a clunk on gear selection. The LUC is either fully on (locked solid), off (disengaged) or in its ‘continuous slip’ mode (approximately 3% slip) which is used to eliminate torsional vibration at lower engine speeds as ZF decided not to fit a damper to the Sachs W260/280S-2GWK unit to save weight/space. Phil
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#4
10th March 2014, 12:27 PM
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Huge thanks Phil from me for all your sharing of knowledge and input to our forum, I'm sure I will try to make many of your replies stickies where appropriate
 Cheers Neil
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Confidence is the feeling you have before you know better . . . .  Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange 2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee 20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble  Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble Audi A8L D2 4.2 Petrol with LPG - Ebony Black Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior and some other A8's A8L's and Mercs
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#5
12th March 2014, 04:15 AM
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Thanks Phil. Very useful information. So, it's not the LUC causing the clunk. Any ideas what it could be?
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2001 D2 S8. Volcano black. KW Variant 1 coilovers. EBC Turbo grooved discs with Yellow Stuff pads. 19 inch R8 replica wheels with 255/35/19 Michelin Super Sport. In the UK, 1990 Audi 90 2.3 20v Quattro with just 65,000 on the clock and in mint condition.
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Linear Mode
