Sea Trials for Performance and Warranty

NOTE: John Deere Marine Engines are not eligible for an extended warranty until proper installation and performance is found to be consistent with John Deere’s Application Guidelines; verified by a sea trial. Once a sea trial has been completed, your John Deere dealer / distributor will provide the results to John Deere for analysis. If the engine installation meets all guidelines it will then be eligible for extended warranty.

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Following any John Deere marine engine installation a John Deere Marine dealer should conduct a sea trial in order to validate proper installation. In order to maximize the performance of each vessel, it is very important to have each installation checked mechanically and electronically before it is put into regular service. The testing and investigation conducted during sea trials can proactively identify issues before they potentially result in performance problems. Sea trials also provide valuable insight to optimize engine performance, improve long-term durability, and provide a useful reference for future updates.

Two important requirements examined in a sea trial are exhaust backpressure and rated engine speed. Exceeding the recommended backpressure could result in extensive engine damage or failure. The rated engine speed is checked to verify the vessel is not over-propped (propeller is too big) or under-propped (propeller is too small). Either of these conditions will reduce engine life expectancy, increase repair costs and negatively impact fuel consumption. The John Deere Marine dealer should also verify that the additional requirements set forth in the John Deere Marine Application Guidelines were met during engine installation.

The overall benefit of the sea trial is to verify the engines are installed correctly and are properly matched to the vessel. This provides for the best possible performance in the unpredictable conditions you may operate in on the open water.

NOTICE: ANY ENGINE DAMAGE RESULTING FROM OVER-PROPPING, EXCESSIVE EXHAUST BACK-PRESSURE OR OTHER INSTALLATION / RIGGING ISSUES ARE NOT COVERED UNDER WARRANTY.

NOTE: The specifications section in the back of this manual lists the rated speed for each of the different available power ratings.