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#11
22nd January 2010, 08:53 PM
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Thanks Conan.
I've had the small vacuum hoses replaced as they were all perished - not the breather pipes. Cheers for the VAG COM tip, I'll try it either tomorrow or Sunday and let you know. Wouldn't it have logged a fault if there was a misfire though? I have phoned a local VW/Audi specialist (where I should have gone to in the first place). They say that it sound like the cam timing is out which, speaking to a few other people, sounds plausable. 
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#12
23rd January 2010, 03:32 PM
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Hi there.
Sounds very much like they havent got the timing belt on correct. On most Audi engines the cam pulleys are mounted on a taper and so have to be loosened from the cams when tensioning the belt. A quick check to see if it's on wrong is pop one of the belt covers off a bit so you can see the cam pulley. If there's a Tip-Ex mark on the cam pulley and the engine then they have definately done it wrong! As the tension settles it pulls the timing out if they havent set it correctly. If they have done it right then check a few bits, such as spark plugs, air leaks on inlet and check the inlet manifold hasn't worked it's bolts lose - they like doing that! Also the inlet manifold has change over flaps inside and they can sieze, if during the belt change the guys have moved these then they could have upset it. You should be able to move the 2 change over valves by hand, although the springs are strong, you will get free movement. Feel free to call me if you need advice: 01283 548 483 (although I'm not at work now!!  )
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#13
23rd January 2010, 04:56 PM
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Thanks very much for that, I think I now understand the reason for a tapered cam sprocked as opposed to a keyed one. I'm guessing that the cams can be completely locked in place along with the crank (?) then, the belt could be removed, refitted and tensioned without any of the engine moving. This means that no Tip-Ex marks are necessary. Does this sound right?
Like you say, I need to get the cover off to check if they've marked the sprocket and engine. I'll do it tomorrow and report back. Thanks again.
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#14
23rd January 2010, 05:02 PM
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You have guessed right. Ben has pointed out that with the special tools the cams are locked in place the cam sprockets are loosened so they can rotate and after all the new parts are fitted and the cam belt tensioned. The crank is turned several times to make sure all the tension is taken up. Once this is achieved then it is brought to TDC and the cam sprockets are torqued up while being held in place. The cam locks are removed and all is in sync.
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Conan (the Librarian) Watch it if you dare Currently, 2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block. 1997 4.2 A8SQ - the Projekt. 12 years and ongoing! 1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard 2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion. 2005 C5 Allroad 2.5TDi FE - Grey - Workhorse. 2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter. Previously 2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex 1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure. 1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex. 2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on. 1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8. And a list of non VAG going back 40 years before I saw the light.
Last edited by Conan_the_Librarian; 23rd January 2010 at 06:33 PM.
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#16
24th January 2010, 04:32 PM
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Good call Ben. Removed the belt covers today and found that someone has made red timing marks on the cam sprocket and engine. Looks like the job hasn't been done properly. I'll call the garage in the morning and let you know happens.
I'm guessing that everything needs to come apart again, lock the cams, set everything to TDC and tension everything up.
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#17
24th January 2010, 05:41 PM
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Afraid so - it needs doing again. It should be fine but it's annoying that someone is prepared to undertake a job such as a timing belt replacement on a car like an S8 without arming them selves with the right info and tools!
If you need full instructions and tool list from ELSA let me know. It'll drive loads better when it's done. The self created timing marks are the dead give-away! You'd have thought that if the mechanic has to make his own timing marks he would become suspicious of how it's done!!!!! Never mind, atleast you know what it is and rectification is straight forward.
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#20
26th January 2010, 07:02 PM
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Well the garage were very receptive to my input. I've given them the info from the audipages website as a rough guide as my car is the 40v not 32v. I'm trying to find the relevant tools for the task and there seems to be two very different types; the one on the audipages site (which it explains that the 40v version is slightly different) and this one...
http://www.sealeyonline.co.uk/vs4827...-7-4-2-v8.html If it's not the one, can anyone recommend one or are they a specific Audi tool? Thanks. Last edited by tonyt102; 26th January 2010 at 08:47 PM. Reason: typro
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