Quote:
Originally Posted by joe90
I was told by a mate who has been buying, selling and running audi's for over 20 years that the fith cylinder lifter doesn't get enough oil, ...
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Bollocks, not to mince words.
However - you'll notice that the lifters are not quite directly under the cam lobes. Each time the lobe comes down, it imparts a small tangential force to the lifter so that it turns to spread wear uniformly over the upper surface.
Sometimes you get a 'cyclic' lifter - tap taP tAP TAP TAp Tap tap. On a solid lifter engine, this is caused by a piece of detritus under the shim - on a hydraulic lifter car, it's a sign of the lifter starting to fail. When the lifter inlet oil inlet hole is opposite the feed hole in the block, it pumps up and goes quiet. A few seconds later and the inlet hole is 180 degrees away and a failing lifter will collapse a little, giving a tick.
The trick is to listen very carefully and try to discriminate the lifters from one another. The cycle is usually about five seconds, but varies along every engine so you will sometimes hear 'beats' and sometimes just a general racket.