i just finished the crankshaft seal replacement on the Chevy volt (2014). The video above helped a lot, but one of the hardest parts was getting the motor bracket off.. one of the three Bolts comes off easy..for the most forward bolt, you have to raise the engine (I was supporting it and lifting it with my 3 ton jack placed under the oil pan).. enough so that you have the Clearance to remove the bolt...My 2014 volt makes the same exact noise as the video above (front crank shaft seal gone bad) and the noise also stops when you pull the dip stick out.... Only problem is that the video is for a Chevy Cruz. From the looks of it the Chevy volt has a similar engine... so this should help me enough to be able to accomplish the seal change..
for the bottom bolt, you have to lower the engine.. and also, disconnect and pull to the side, the 3 coolant hard lines that are in the way in the wheel well, then you will be able to barley clear the bolt removal...
other than that, I just got the crankshaft pulley free by prying it off..(after removing the bolt with an E18 socket and a breaker bar), but I got the pulley off with the belt still on it..
Then you move it to the side and replace the seal and put everything back...