Well, I took the assembly to a Tooling Engineers, they oversized a hex for me by 0.0004" to make it nice and snug and free of most play.
Cost me £60.
Hopefully the Turbo hasn't crapped itself.
Hi, I have a VW Passat 140Tdi with a BKP engine. It uses a gear driven pump so luckily don't have the additional chain woes. I have suffered the dreaded hex drive failure.
I bought a new hex drive, but there seems to be a little bit of play when the hex shaft is inserted into the balance shaft...
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