I noticed a lot of movement in the front motor mount on my 2005 tC. My question is, why does the bracket have a slot in it where the motor mount bolts to it .
This lets the engine move about an inch. It will also make a knock sound if you shift hard. Tightening the bolt helped but I don't understand the slot in the bracket.
I found the factory parts drawing and it shows the slot so I know it's factory. There is even some wear on the bolt where it has been moving.

 

Mount might be bad. I had the bolt knocking before.

 

I just replaced my front motor mount yesterday. I noticed that the bushing on my OEM mount was different compared to that of the bushing in the new OEM mount. I'm assuming there were a lot of part changes during the change from 05-07's to the 08-10's. The engine doesn't move as much at idle anymore. I was going to take pictures but totally forgot to and just installed the part.

 

I was wondering if anyone had modified the mount so that the bolt would not move. I was looking for some insight into why this mounting bracket was made the way it was.

 

To my knowledge, no one has had a problem with the stock mount design. Ptuning makes an entire front mount. I am assuming the slot is to allow the manufacture some tolerance to assemble the car. If the bolt is torqued down properly and the bushing is in good condition you should be good.

I went back and looked at the Ptuning mount. I think it still uses the bracket with the slot.