Could I post-conclude with a really bad killer for the 2.5TDI's ?
Leave the crankshaft pulley bolt loose, or at-least let an incompetent garage change the timing belt/s without realising that;
a) The bolt must be renewed each time (it's a stretch bolt)
b) The torque is 160Nm + 180degrees, "near enough" is not good enough
c) There's no Loctite on these; if you need Loctite, you're not doing it up correctly!
d) The crankshaft end-face and associated TV-damper face must be a good machined finish
e) Your favourite local garage has probably lost the special washer that goes into the clamped joint, but this, too, must be replaced each time the TV-damper comes off for the timing belt change. It's diamond-faced, but it doesn't cost a fortune (about £6) and will save your engine
If the crankshaft bolting to the TV-damper is not good, you will have endless issues of vibrations in the pump drivebelts and tensioner pulleys (with short lifetime on each) but also the engine will eventually self-destruct when the TV-damper finally comes loose. The crank timing gear only has a sintered woodrough key cast into it, and this will shear, allowing valves to meet pistons, requiring (usually) a spare cylinder head to be fitted.
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