If the old mounts were compressed over the years, there could be a small lift of the engine with new mounts. If the lift is more than an inch or so, you should check that the proper mounts were installed.
Engines are held into the vehicle with "motor mounts"... although they should probably be called "engine mounts". Motor mounts can go bad and the engine can move excessively. If a motor mount has failed, take it to just about any reputable mechanic and it can be replaced.
The most probable reason for the engine to shake at idle is the motor mounts may need replaced. This is generally from the front and rear motor mounts; however, the sides may need replaced as well.
A 1994 Corolla engine may vibrate if the motor mounts need to be replaced. The motor mounts can be purchased at any auto parts store.
MOTOR MOUNTS Motor mounts should always be replaced in pairs or sets along with transmission mounts. Age, oil and grease cause deterioration of the rubber leading to vibration, chatter and failure. No restoration is complete without new motor mounts. Motor mounts (engine mounts) are used to connect a car engine to the car frame. They are usually made of rubber and metal. The metal portion connects to the engine on one side and to the frame on the other. The rubber is in-between to provide some flexibility (so engine shake doesn't cause the car to shake). Newer cars may use slightly different mounts; however, their purpose is the same. Provide the connection from the engine to the car frame. The number of motor mounts varies from car to car. The motor mounts are located in most cars / trucks on the frame just under the motor. Hope this helps
You should check your motor mounts
The 1999 Mitsubishi has four motor mounts. There is a motor mount on each corner of the engine. The motor mounts can be seen from the bottom of the engine.
The 1997 Buick is equipped with four motor mounts. There will be to motor mounts on the rear of the engine and two motor mount on the front of the engine.
While it is possible for an engine to fall out if the motor mounts are bad, it is very unlikely. However, a broken mount will likely destroy the engine if it is not replaced.
small block and big block motor mounts are the same, so you should be able to take V8 motor mounts from most any Chevy engine bay.
If I understand what you are referring to, the rubber spacer is part of the motor mount and cannot be replaced by itself. It is bonded to the metal of the motor mount.
The 1994 Mitsubishi 2.0 liter engine will fit into the 1995 Mitsubishi automobile. The motor mounts from the 1994 will need to be replaced with the motor mounts from the 1995.
This job is of skilled to moderate difficulty. It will require the vehicle to be safely lifted and the engine to be supported. Once lifted and the engine supported the two engine mounts can be unbolted. It would help to have an air wrench due to the torque involved. There should be two bolts retaining each mount. Once removed the mounting surfaces should be cleaned and degreased. The new mounts can then be replaced.