A Honda outboard engine has been stolen from the East Quay on Mill Street in Peel.
It happened sometime between Tuesday and yesterday.
Police want to hear from anyone who knows what happened, or saw anyone acting suspiciously on East Quay over the last few days.
They say the outboard engine was attached to a small boat and would have taken a little time to remove.
Police appeal to find three individuals to help with investigation
It's following an incident near Sam Webb's pub in Douglas last month
Dates for offshore windfarm scrutiny meetings announced
Independent examining body to look at plans for Mooir Vannin project
Some residents in Onchan without power
Third party damage has affected the supply
January's inflation rate stays the same
The annual rate as measured by CPI remains at 3.3%
Child benefit payments delayed due to technical issue
Treasury apologises following system fault