Thieves swiped boat parts from a yard in Easington Lane.
Police are now appealing for witnesses to the theft, which happened between 3.30am and 5.30am on Monday, March 7, in Blindy Lane, to come forward.
The thieves stole seven Ultraflex boat throttle assemblies and one Mariner throttle assembly.
Officers are carrying out enquiries into the theft and appealing for any witnesses - in particular anyone who may be offered a similar item for sale - to come forward and speak to them.
Anyone with information is asked to contact Northumbria Police on 101 quoting reference 129 080316 or Crimestoppers anonymously on 0800 555 111.