mkay. right after i did my clutch my front engine mount died - it was all torn up and dry rotted. engine was knocking the front like crazy when let up the clutch pedal and put stress on the engine. i replaced it with a used mount i found in a junkyard, no cracks in it and it seemed to be cool (and free). it was fine for 2 weeks. then, the knocking came back n it feels like same problem. i checked all of the engine mounts and none are cracked or anything.

can the front mount be dead, and not have any obvious cuts or cracks?

 

THings aren't always what they seem in a junkyard. Grandma could have drove that car that you got the mount from and perservd it in good condition, but the rubber will still dryrot in time. Get some windshield urethane or a new mount.