Question about Audi A3

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I bought a 2004 Audi A3 2.0 Tdi. The engine was running little rough but it sounded more than a louder than usual diesel knock.While I was driving it suddenly made a louder noice and didn't want to pick up revs. I have traced the noice back to the flywheel. After removal of the flywheel I discovered that it has rubbed at the back against the aluminium sump and also caught on the main oil seal at places. This resulted in aluminium blobs sitting against the back of the flywheel. I saw that there was play on the flywheel when you try to turn it in any direction and that there is no movement at the front on the cam-belt side.I then removed the sump and discovered that the crankshaft is broken at the main bearing between no.3 and 2 piston.The "spacers" on the flywheelside of no. 3 mains bearing which prevent horizontal movement is also badly damaged, in fact the bearing cap need to be replaced as the crank did rub against it. Some of the mains bearings show heavy wear as the copper on the bearing starts showing while the big-end bearings still seams fine. 1.Why would the crank break ? 2.Is the wear on the bearings, and the break, due to the vibration caused by the flywheel rubbing against the sump ? 3.. Could it be poor workmanship as it seems that the sump and flywheel were previously removed and worked on ?

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I have experienced this when rebuilding engines. and what happens is the crank shaft will not get reground right and that will cause it to walk against the thrust bearings. and that is why you heard the scraping sound. and also if it is not the right fly wheel it will cause the engine to be out of balance sending the catastrophic failure to the crank. also this could be the cause of a lack of lubrication in the engine. I would try to see what work has been done to the car using a car fax report wich you can get online by entering the vin# website is www.carfax.com if you need more info just let me know and i will do my best to answer any more questions you might have
Thank you and please give me a rating

Posted on Apr 21, 2009

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