Basic Maintenance Mariner 3.5 HP 4-Stroke: Oil, Spark Plug, Impeller & More EP29

In this video, I show you how I perform basic maintenance on a Mariner 3.5 HP 4-stroke outboard engine. We change the engine oil, gear case lubricant, spark plug, and the water pump impeller. I also test the engine on a custom-made wooden stand I built myself, using a bucket of water for cooling simulation. Perfect if you want to keep your outboard in good shape and do the work yourself without complications. ?? Disclaimer: This video is for informational and documentary purposes only. Performing mechanical maintenance involves risks. If you choose to replicate any of the steps shown, you do so at your own risk. I take no responsibility for damage, injury, or consequences resulting from the use of this content. Don't forget to subscribe for more boating and DIY maintenance content! 00:00 - Introduction 00:22 - Presentation of the custom-built test bench 01:19 - Securing the outboard engine to the bench 01:47 - Draining the gear oil from the lower unit 03:32 - Propeller removal 04:18 - Removal of the lower unit 08:09 - Replacement of the water pump impeller 13:31 - Reinstallation of the lower unit 18:39 - Reinstallation of the propeller 21:26 - Refilling marine gear oil in the lower unit 27:44 - Installation of the sacrificial anode 28:38 - Draining the engine oil 30:04 - Spark plug replacement 33:00 - Refilling the engine with 4-stroke oil 34:57 - Bench testing with water cooling system 40:00 - Closing remarks