I have never done this on a Commander, but done it several times on other vehicles, so take this with a grain of salt and just a general guide to judge if you think you can do it yourself.
You have to pull the harmonic damper off the front of the engine, this may require you to remove the radiator to have the room to do it. Meaning you also have to buy G-05 anti-freeze to replace what you drain.
From what I can tell, the Commander has NON-indexed, NON-keyed damper on its engines, like a lot of Chrysler engines of late. This harmonic damper/pulley has a very tight interference fit and it will need a good quality, several ton puller to pull it, with an insert to protect the threads of the open bolt hole in the crank (you can improvise by getting a longer bolt of the proper threads at the hardware store, make sure its grade8 SAE or grade 10.8 Metric at least). You'll of course have to remove the accessory belt and maybe even the fan for access, before pulling the damper/pulley.
Once you pull the damper, you just have to pull the seal in the front cover. Just wrap tape around the crank snout to protect it from scratching and then use a narrow and long straight edge screw driver to pry up one edge and pop out the seal from the front cover.
Fit the new seal over the opening, make sure its even, place a proper fitting Deep Well socket that clears the crank snout over the metal portion of the seal and tap it down flush with the cover.
Re-assemble is reverse, use the longer bolt for the damper, so you get more thread bite, to force the damper on the crank snout, use washers with grease between them and even some deep well sockets as spacers as you drive on the damper on the end of the crank. An air impact wrench helps with this immensly, but you can do it with a very large screw driver or pry bar as a lever against one of the spokes of the pulley against a bose on the front of the engine to keep the crank from rotating with the bolt tightening down the damper.
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