S52 VANOS (Variable Nockenwellensteuerung) Rebuild
I've finally got around to installing the Beisan Systems VANOS seal kit that I purchased a few months ago; I also picked up their Rattle Repair Kit just in case. I used a Red Line Tools RL113240K Single VANOS Timing Kit to lock down the flywheel and valvetrain to service the VANOS assembly.
Although it didn't appear that my VANOS assembly needed it, I tried to install the anti-rattle bushing anyway, but even using the cut down socket from Beisan I couldn't get the assembly apart. I didn't want to bend the aluminum VANOS housing with too much vise action; the fastener was torqued down so hard that the housing would spin out of the soft vise jaws. I should have used a torque wrench to gauge the amount of force I was putting on things, but it was significant. Encouraging the VANOS assembly apart with Mr. Heat Gun was also ineffective (he was previously undefeated); rather than break something, I only installed the Beisan o-ring and seal set.
Cams locked down:
Cam chain pinned:
S52 VANOS Assembly with old o-ring and seal:
The idle seems smoother after the VANOS refresh, and perhaps there is a mild off-idle torque improvement since the rear Michelin PSSs squeal a bit easier on takeoff if I'm not careful.