Quote:
Originally Posted by deansbimmer
There is no BMW check process documented for mechanical assessment of these VANOS units. They do expressly state do not disassemble. However, we have successfully disassembled and reassembled them. (A tech post documenting it has been on my to-do list).
I do not recommend cleaning them ultrasonically without any further action. You need a way to physically remove (flush) any debris from the adjusters and an ultrasonic would only dislodge them and even that's not guaranteed. There's no way to flush out any dislodged debris. Swarf collects between the rotor blades and becomes pressed into the surfaces until it impedes rotor movement. I've also seen the internal check valves break and jam the internals. The only way to verify their condition is to carefully disassemble them.
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Thanks dean. Is the process difficult (i.e. need to drill out fasteners or something), or pretty straightforward? I'm happy to disassemble them. The exhaust unit is spring loaded, and I've not "released" it to see how far back it springs.. I guess I have enough spares to try it out on one exhaust and one intake unit though!
Thanks!
S.