its the compressor for sure if it sounds like an engine, thats bad. heres what it says about the compressor.
Item # XXXXX
Refrigerator compressor kit. *Call to verify correct compressor for model.
Click here for important information about this part
This part has been permanently discontinued by the manufacturer and we don't know of any source for the part
Manufacturer Number(NNN) NNN-NNNN/p>
if someone did have one your probably looking at between $800-$1000 plus the labor and freon recharge. this could run you upwards of $2000.00 or more. you may want to start looking at new ones.