that cast elbow goes into the timing cover, if you dont pull the alt bracket off straight the timing cover cover coolant inlet hole will break. then your changing the timing cover on the engine.
this is why its just a little wiggle as you pull it off. this can seem like its taking forever, walk away, take 5, come back to it if need be.
once its off, clean the 3 holes out good and the cast elbow, take the new O ring off the new elbow your not using and put it on the cast elbow. re install it with a new upper elbow.
