Outboard Lower Unit Tear Down: Seals and Prop Shaft Repair Yamaha F90

Tyler Holland, Outboard Specialty Tools, showing methods and tools used to repair and replace leaking oil seals and prop shaft on a Yamaha F90 lower unit. Complete removal, inspection and re-seal on gear case. This video covers other topics along the way such as water pump replacement, pressure testing for leaks etc.
For Tools seen in this video and more information, please check out our website:
www.outboardst.com
Tools Used in this video:
OST-0024 Bearing Housing Puller
outboardst.com/product/lower-...
OST-0001 Shift Wrench for Yamaha, Suzuki and Mercury
outboardst.com/product/shift-...

[@CuttingEdge49]

You are the goat. I have a f200xb 2015. You’ve taught me a lot. Where I need work or not.

[@roberthb4652]

Thank you for this very informative video ❤

[@outboardst.comoutboardspec8631]

All Good and thanks for watching!

[@clintonadams8434]

WOW, what an excellent video!!! Would like to see the trick to remove the propshaft seals?

[@andycmeyer6675]

That was extremely well done and helpful! One thing I didn't see is how you got the 2 seals out with the seal puller. Where can a guy get a puller? Thank you for this great video!

[@jfrrodway8235]

Brilliant. Thank you.

[@outboardst.comoutboardspec8631]

Thanks for checking us out!

[@PatrickCobb-kh5hd]

I'm having trouble breaking the retaining ring out any suggestions?

[@ALVintageOutboards]

You make these type of tools in-house?

[@outboardst.comoutboardspec8631]

We do all of our design and concept/prototype in house. Nearly all of our assembly and prep is completed and inspected in house. About 80% of our steel tools are machined in the United States with the remaining 20% coming from our machinists outside the States.

[@Cherishthemoment]

There is a tool for removing the retaining ring, just saying, a little risky drilling….

[@outboardst.comoutboardspec8631]

Oh for sure there are many tools for the retainers, and I have to use a retainer wrench to reinstall the new retainer during re-assembly. The reason I usually always drill the retainers out is that once the salt water builds up some corrosion on the bottom/skeg side of the retaining ring, it will often deform the ring out of round to the point that most retaining ring tools won't even fit the ring and the scale deposit itself isnt going away peacefully. We go into some detail on this at the 3:18 mark. If the retaining ring goes out of round with a wedge of scale between the inner bore of the casing and the outer threads of the ring, it only comes out one way: in pieces.