Green Diesel Engineering has a great write up on the passenger side mount. Not so for the driver's side, that I could find.
First, if you get some kind of rattle which is barely perceptable to the ear it's probably the mount. Mine was worst in reverse, and I replaced the passenger but the noise was still there. Went away as I drove. Put your CRD into 4Lo and you will hear it REAL good! Not really a metallic rattle, but definitely there. Mechanic specific to CRD's said mounts were ok

. At 70k just replace them, took maybe 2 hrs a piece at a leisurely pace. Buy both of the driver style (no heat shield).
When doing passenger side, take mount out and place in vice with mount through, and shield catching on vice jaws. Whack the stud coming out the top of the mount and that will drop the mount stud through the shield. Turn shield upside down and use a bolt or something to shape "fingers" on shield to face inside the bowl of the mount. Simply put the new mount in the vice and close jaws on the mount GENTLY, and tap the shield onto the new mount. Takes 5 min.
Best way to do the mounts is to run on ramps and use a floor jack on the engine cross member to slightly lift the suspension (tires still touch the ramps, but extend the suspension to just before the tires depart the ramp. This gives you room. Unbolt the mount top and bottom (18mm deep well.) Hold the floor jack there and use a bottle jack under 4x6's (or 2x4's, and a battery!) and jack the corresponding corner of the engine up. I never had to remove the fan shroud or fan.
Since the passenger side is well covered and you should do this first for experience, we will not cover it.
For the Driver's side:
Drive up on ramps. On the driver's side,
take out the battery and battery tray (three nuts on tray). Remove intercooler to engine hose (CAC?) I have since been informed that a person does not have to remove the battery tray or CAC hose, you just need some extensions and joints. Undo the top nut on the mount. Jack up the vehicle as described above using the floor jack. Use jackstands! Underneath the engine do yourself a favor and get some ratcheting swivel head wrenches (Photo A) Place the ratchet head on the lower nut and swivel to allow swing. Use a bar to pry against the motor mount bracket with one end, and the other in the open end of the wrench and turn the nut loose (Photo B). After a while you will be able to just use your ratcheting wrench to remove the nut. Use the bottle jack arrangement described above (Photo C) to gain clearance on the motor mount and once the mount stud will push out through the bottom mount bracket(up), go to the top and finagle it out. Place in new one and go backwards sentence by sentence to put back together.
Creepers are good.
Seriously buy some swivel ratcheting wrenches, I use mine all the time.
All motor mounts look good, even ones that have gone bad. Bad ones rattle, good ones do not. Not yet...
Photo A

Photo B
Sorry it's blurry, I was kinda in a hurry. It's 30F some degrees.

Photo C
Laying on my back under engine compartment, right behind the front wheel. Aluminum looking thing on right is the motor, mount looks good.....

Ratcheting wrench levered with pry bar on motor mount bracket (rusty thing)
