Engine vibrations

[Hockeygoon]

I installed a new long block in my 2005 Liberty Sport. With a cold start up there seem to be extra vibrations from the engine - no misfires, maybe a slight roughness in sound (???) but a noticeable vibration that can be felt through the entire vehicle. After its been running a few minutes it fades away.


Typical 3.7 roughness from a new engine or something else?


I know if the balance shaft were out of time it wouldn't go away (or would it)?

 

[Rowlette]

Just a thought did you look at your motor mounts.

 

[M38 Bob]

I hired a new long block installed in my 02. From the moment I picked it up until now it's been as smooth as any V6 I've ever encountered.

Bob

 

[TwoBobsKJ]

Just a thought did you look at your motor mounts.

When I swapped in my new engine I replaced the motor mounts as well. Driver's side was shot so I just replaced both of them.

I thought the roughness I was feeling was the old engine going out. I think it was also the motor mounts contributing to the shakes.

Bob