Compression Tests

Steve can perform compression tests on Gasoline inboard and outboard motors upon advanced request. If you would like a Diesel compression test conducted, please let us know when you request your survey and we will help arrange for the appropriate engine surveyor to be at the inspection as well. Please note that all compression tests require a separate fee in addition to the actual survey cost.

Procedure

Compression tests start with the removal and inspection of all spark plugs. A compression gauge is then inserted into each cylinder area, and each reading is compared with all the readings around the motor and with the manufacturer’s specifications. If there is low compression it should be no less than 15% of the average cylinder readings. Any low cylinder reading is checked against a second, separate compression gauge to assure the reading is correct. A short report of the findings is provided.