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Simply raise the car and support the engine on a jack, then unbolt it.
There is no fixing a broken motor mount. Replace them with a new ones.
Follow the Youtube instructions.
look at how much the engine moves, if moves more than 1" fore-aft, replace. if you can see the rubber in the mount and it is torn, replace. replace the lower mount too
The year, make, model and engine wasn't mentioned but in general you remove the motor mount anchor bolt(s), lift the engine a few inches and support it safely, unbolt motor mount(s) from engine, remove mount(s), replace mount(s) and finish in reverse order.
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The engine needs to be supported on a jack so that the cradle can be lowered after the through bolts are removed. The left rear mount will require supporting the transmission while the through bolt is removed.
You need to jack it up enough to take the weight of of the mount.
At the front of the motor attached to the engine cradle.
You need to support the engine so that the cradle can be removed and the mount can be unbolted and replaced.
Purchase your replacement part. Put a jack under the engine with a board to support the engine. Put slight pressure on the engine but no more. Remove the mount and replace. Lower jack.
There is 1 mount on the front of the engine and 2 mounts on the transmission. Put a large block of wood under the oil pan of the engine and jack it up to take the weight off the mounts. Remove the bolt and fasteners on the engine mount. Replace it first. Then replace the 2 mounts on the transmission. The front mount is accessable but the rear mount you have to take the cross member off to get to it.