The check valves are behind the chain housings. I think they are not low enough to require taking off the lower chain housing so it would be a solid half day. People often cheap out and don't replace the oil check valve when doing chain/guides. I just realized you'd have to re-time so lets hope it's not check valve.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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