Mounts are a lot easier job than brakes/ wheel bearings Bodhi !!
You dont need a special tool to check mounts, I just see if my finger fits, if not then the mount has collapsed. Sixto's post takes the guess work out though!! A bit of 1/2" rod or the end of a 1/2" square from a socket extension should work. Normally its the left mount that fails first, too much fuel etc around it. If you have a vibe at speed or under load, the right hand one would need to be checked.

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving