Sailing Catalpavideo

Save $$$ Servicing Your Own 15HP Mercury Outboard (4-Stroke) Episode 494

June 7, 2026 · 25 min · 6K views

Man drains oil from outboard motor into container on sailboat

What this video covers

A 15 HP Mercury four-stroke outboard gets a break-in service before an offshore Pacific passage, with the work performed by Lee aboard Catalpa.Watch The service covers propeller removal, spline greasing, and inspection for fishing line near the prop shaft seal — a common failure point that allows gearbox oil to escape.1:54 Gearbox oil is drained and refilled from the bottom drain hole using a hand pump until fluid exits the top port; the fill quantity works out to roughly 500 ml of SAE 90 weight gear oil.5:47 The lower unit leg is dropped by removing four bolts and the gear shift selector nut to expose the impeller housing; the impeller is inspected but not replaced because the motor is new, with replacement scheduled at the 100-hour service.9:33 Engine oil is drained with the motor tilted up, the oil filter replaced with a genuine Mercury unit (West Marine stocks both Mercury and Quicksilver), and spark plugs swapped out.16:03 Greasing points on the tiller pivot are serviced monthly given daily tender use.14:17 Four zinc anodes are identified and checked.14:09 All consumables and tools came from West Marine, the episode's sponsor.0:09

Watch on YouTube

Featured in the fleet's guides

More from Sailing Catalpa

Life aboard sailing across the Pacific Ocean..Ep 502Aug 2026What's broken? Sailing across the Pacific Part 2Aug 2026Sailing 4000nm across the Pacific Ocean PART ONE Episode 500Jul 2026Safety Upgrades we made to SAIL across the PACIFIC OCEAN Episode 499Jul 2026

From Sailing Catalpa — see the channel’s boat, crew, and every analyzed video.

The Sailing Directory Newsletter

One email with the fleet's best finds — the moments, boats, and stories worth your watch time. Enter your own address to get your own copy.

Report an issue