Motor Mount Problem

I have been batting a front end knock for months now. I've replaced
sway links and bushings, checked ball joints, etc. I even found worn
rubber bushings on the brake caliper pins which I replaced but that
wasn't the problem either. The other day I was driving slow in low gear
when I noticed the clunk when I lightly tapped the pedal. Yes! Motor
mount. Well, I took off the front mount and couldn't see any problem.
Now my question. How can you diagnose the right engine mount and the
left trans mounts? I've considered sitting in the motor compartment
while my wife slowly drives in low and taps the pedal to create the
clunk. I know, not the best idea. The right mount is also hydraulic.
Does anyone have any knowledge of these and what they do when they fail?

 

Sorry, fogot to mention. It's a 2002 Caravan 3.3 FWD

 

look at the front mount carefully it might have a cracked alumium frame around
the rubber if memory serves me right there was a tsb on this issue

 

You can often successfully and more safely have one or two friends rock
the vehicle back and forth with it in park (engine off) as gently or as
violently as necessary to duplicate the problem while you watch the
engine/tranny and mounts.

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')

 

that does work well among other ways

 

Thanks group for the info. I will give it a try. This really has been a
hard one to diagnose.