Hey everyone,
I’m currently rebuilding my S52 engine and I’ve run into a snag while doing the VANOS/timing setup. I’ve got the crank and both cams at TDC, the cam lock blocks sit flush, crank pin is in — everything is aligned mechanically.
Here’s the issue:
When I rotate the exhaust cam sprocket counter-clockwise, it almost hits the mechanical stop, but it’s missing it by a fraction of a millimeter. I haven’t installed the VANOS yet, so I’m wondering — is that normal? Or does this mean something is already off?
From what I understand and have heard is the sprocket won’t hit both mechanical stops until the VANOS helical gear is installed and properly engaged — is that correct?
My main concern is making sure I:
• Get full VANOS travel after installation
• Don’t lock everything down if I’m a tooth off
Also, once the VANOS is on, how do you all verify that the exhaust cam is hitting both mechanical stops if you can’t physically see the helical gear anymore? I’m trying to confirm full travel, but everything is hidden.
Any insight from those who’ve timed VANOS on an S52/M52 would be appreciated — especially tips on checking engagement and common mistakes to avoid.