Had the same problem. If you didn't soak the tension piston in oil then the intake cam probably skipped a tooth. Don't start it again until you check the timing. Then check the tension piston. Reset it and you should be okay. No need to push all the oil out, just push hard to get the cup nut to start threading when re-installing.
If you drove it at all with the timing off you better check the valves if you hear any noise after you get the timing fixed.