Vanos needs service - dealer or indy shop??
All - my motor has developed a loud tapping sound from the upper front of the motor in the vanos/valve cover area. Noise is audible from idle to about 4K when it blends into all the other engine noise. Most prominent at 1200-2000Rpms. I have removed the belt temporarily and noise persisits; this rules out the pullies, belt tensioner and bearings in the accessories. Car has ~30K miles. Valve shims were checked/passed at ~21K. Camshaft bolts were changed & threadlocked about 26K and valves where checked again. Engine is stock at the moment.
Likely causes include a noisy valve (lost shim?) or a vanos problem.
My question is: do I go with an unknown dealer with an admittedly good reputation - under warranty -- or do I use an independant BMW shop of known excellent quality and pay out of pocket? The worst-case scenario is probably a full vanos teardown/rebuild w/valve shims costing around a thousand-ish at the indy shop.
Last edited by blender; 11-05-2010 at 12:07 PM..
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