Discussion Starter · #1 ·
Replacing cam chain tensioner on 2000 Passat v6, drivers side. Car ran good, no codes but loud cam chain noise. Plastic worn, I replaced plastic pads and re-installed without taking out the exhaust cam. Before I removed, I turned engine over by hand and chain was very loose and popping, to line up marks. Set at TDC (mark on crank shaft pulley) and exhaust cam lined up mark, intake did not line up. Counted 15 links between. I marked cams and chain at 16 links. I thought chain must have slipped a tooth when I was turning the motor over. When I finally got the tensioner and intake cam in place, timing looked good, with intake cam lining up pretty much on the mark (exhaust cam not touched - held by timing belt). Turning engine over by hand I had some resistance so I turned it back, checked marks, looked good to me. I applied lots of oil to all the cam lobes and timing chain, and slight resistance but then felt much better (praying I did not damage any valves). Counted 16 links - put back together. Started car, lots of rattling noise and check engine light. codes - cam timing off. Took valve cover off, if I line up the cams to the marks - 16 links, but if I set at TDC, exhaust (and intake) cams are not on the mark! It's like the exhaust cam is out of time! How could this happen? The timing belt is so tight, I cannot see how this could happen? I probably have bent valves. What is my next step??