Yamaha Outboard Lower Unit Maintenance & Repairs Video Playlist

Here at Boats.net, we’ve published multiple videos and articles related to all kinds of boat and outboard maintenance, repairs and troubleshooting.

Yamaha outboard lower unit repairs

Boats.net specializes in selling outboard parts, but we’ve also published many outboard maintenance and repair videos and articles. For this playlist, we’ve compiled a list of our videos dedicated to Yamaha outboard lower unit removals, repairs, rebuilds, remounts and maintenance. 

How an Outboard Lower Unit Works - Yamaha Outboard

How does a Yamaha outboard engine’s transmission work? Watch the video above to see our lower unit cutaway that shows you how the gearbox (lower unit) works in an outboard motor. Take a tour of the lower unit from the drive shaft, through the water pump, and into the gearbox where you’ll see how power is transferred from the motor to the water.

Related: How an Outboard's Lower Unit Works

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Yamaha Outboard Lower Unit Troubleshooting 

Dealing with lower unit issues on a Yamaha outboard? Watch the video above for a walkthrough of some common lower unit problems and where you might look for the cause. Faulty seals can create problems for a Yamaha 225 outboard’s lower unit, and the video above shows you where those problems can originate. Got a grinding noise coming from your outboard’s lower unit? It might not have anything to do with the unit itself, so find out here what you need to check next.

Related: How to Troubleshoot an Outboard Lower Unit

Yamaha Outboard Lower Unit Disassembly 

Watch the video above to see how to disassemble a 2004 Yamaha F225 outboard lower unit step-by-step. This particular motor was beat up and barely running, so it was removed and disassembled in preparation for a rebuild. We remove the water pump, the upper bearing and prop shaft housings, followed by the shift shaft and drive shaft. Next, we remove the needle bearing, the forward gear bearing and the prop housing gear. Disassembling the lower unit might help you out if you’re planning an overhaul on a Yamaha outboard’s lower unit. 

Related: Yamaha F225TXRC Lower Unit Disassembly

Yamaha Outboard Lower Unit Rebuild

Watch the video above to see how to do a lower unit rebuild on a Yamaha F225 outboard motor. It’s a complex process, and it makes little sense to undertake this entire project from a financial standpoint, as a unit with this much damage would be much easier to replace than rebuild. However, we want you to see each part of this process in case you need to repair your outboard. 

In the video above, we install the forward and reverse gears, and get the prop shaft housing ready for installation, then work on the input shaft and shift assembly, plus the output shaft and the prop shaft housing installation. We get the shift shaft built up and installed, then explain how to figure out the forward and reverse gear backlash and get the right shims for the pinion gear to position it correctly. 

Related: How to Rebuild a Yamaha F255TXRC Lower Unit

Yamaha Outboard Lower Unit Installation 

Watch the video above to see how to install the lower unit on a Yamaha F225 outboard. We rebuilt the powerhead, the lower unit, and the exhaust system, mated the powerhead to the midsection of the outboard, and then installed the rebuilt lower unit.

Installing the lower unit is a straightforward job, but you’ll want to take time to prep the gearcase before installation, since it’s heavy and you won’t have enough hands to hold it in place and get it bolted in. 

Related: Yamaha F255TXRC Outboard Lower Unit Installation

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Yamaha Outboard Lower Unit Pressure Test

Pressure testing the lower unit is a great way to make sure all of the seals at the bottom of a Yamaha outboard are holding. Watch the video above to see how to use a gearcase pressure tester to make sure an outboard motor’s seals are keeping water out.

Related: How to Pressure Test Yamaha F225TXRC Outboard Gearcase

Yamaha F225 Gearcase Oil Change

Watch the video above to see how to do a gearcase lube change on a Yamaha F225 outboard. This simple job only requires one special tool, a Yamaha quart pump to fill the lower unit with gearcase lube. These pumps are manufacturer specific, since the nozzle on the end of the pump has to mate with the fitting on the lower unit drain bolt opening.

See how to find where the vent and drain bolts are located, and how to change the lower unit oil on a Yamaha outboard. You’ll know the gearcase is full when you see oil running out of the vent opening at the top. On the Yamaha F225, you should change the lower unit oil after every 100 hours of use or once a year.

Related: How to Change Yamaha F225 Lower Unit Oil

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Yamaha 60HP Outboard Gearcase Lube

Watch the video above to see how to change the gearcase lube in a Yamaha 60HP outboard. Changing the lower unit oil of a Yamaha outboard is important to routine maintenance, and it’s an easy job that only requires a couple of tools. We removed the lower unit on our Yamaha outboard because we were doing several jobs, but it’s not necessary to do so to change the lower unit oil. 

Related: How to Change Yamaha 60HP Gearcase Lube

Yamaha 60HP Outboard Lower Unit Removal

Before we can do several jobs on our Yamaha 60 outboard, we need to remove the lower unit. Watch the video above to see how to remove the lower unit on a Yamaha 60HP outboard. See how to get it unbolted, disconnect the speedometer, and remove the lower unit on a Yamaha outboard.

Related: Yamaha 60 Outboard Lower Unit Removal

Yamaha 60HP Outboard Lower Unit Remount

Watch the video above to see how to remount the lower unit on a Yamaha T60 outboard. For this simple procedure, you’ll want to grease the splines on the drive shaft, the shift shaft, and the water input tube just so things don’t seize up if you ever have to remove it again. 

Related: How to Remount the Gearcase on a Yamaha 60 Outboard

Yamaha 60HP Outboard Lower Unit Pressure Test 

Doing a gearcase pressure test on a Yamaha outboard is a great way to check for leaks around the upper or lower seals. Watch the video above to see how to use an outboard lower unit pressure tester to make sure the gearcase is sealed from water intrusion. We perform the test with the lower unit already removed.   

Related: How to Pressure Test Yamaha 60HP Outboard Gearcase 

 

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