If the engine is not locked at TDC, one or more valve springs are under compression and will try to rotate the engine when the tensioners are released. Do a search, Jake has commented on this multiple times. TDC is the only engine position where the springs to not load the cam drives. If the cams are unlocked and the engine is not locked at TDC, you risk the system jumping time when the tensioners are released. You may get away with doing it in this weird manor, but then again, you may not.............my guess is that you won’t.
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