upper carrier housing - Yamaha

jbdba01 · Joined: 18 Nov 2014 Posts: 172 State or Province: FL

I saw that there was a lower housing discussion here, and figured I would add my recent upper bearing housing experience on a 2001 Yamaha 150 HPDI. I looked at the seals while replacing the water pump and saw the tell-tale milky fluid.

In terms of difficulty - 10 being take it to a pro, this was a 7; challenging, but doable. Just take your time.

I used this video to get (no pun intended) my bearings...

https://www.youtube.com/watch?v=7IAmkvhmCqM&t=1173s

He uses a fancy gizmo to get the housing off. When I purchased my parts I was able to get 5 min with my local mechanic. Basically if you get two screw drivers under opposite corners you can twist the housing a bit and then pry up. Worked for me like a champ. Once you do it you'll see what I mean. The key is the twisting motion. Easier done than explained.

He mentions using a chisel to get the seal out - I would try just about anything first. That said at the end I ended up using a chisel - it took some serious pounding to get it out and once I saw the price of the housing ($90) I figured "WTH - go for it. Worst case scenario replace the whole thing."
Regardless with some persuasion the seals eventually came out.

The video does a good job of explaining things - there's a waterpump video that I referenced as well, but that one is simple enough - the woodruff key being the headache.

Here's some pics of the effort, and the oil was milky, but had a reasonable amount of viscosity in it.

When I replaced the lower unit oil I kept adding oil until all milky residue was gone.

I just ordered a mityvac 8500 to pressure test the seals - should be 10psi and hold. I'll add that effort to the thread. This one has the pressure AND vacuum seal check.

Confirmation that it's bad...

Housing unscrewed and seals out

Housing cleaned up

Buttoned up...

Some parts needed, seals labeled for next motor.

BrentB · Posted: Tue Jul 25, 2017 12:39 pm Post subject:

neat and good job
Did it fail the pressure, vacuum or both tests?

jbdba01 · Joined: 18 Nov 2014 Posts: 172 State or Province: FL

BrentB · Posted: Tue Jul 25, 2017 6:13 pm Post subject:

Thanks. I missed that point,

What fitting are you using in drain hole? The fitting from fluid pump?

BrentB · Posted: Tue Jul 25, 2017 7:22 pm Post subject:

great video! thanks

jbdba01 · Joined: 18 Nov 2014 Posts: 172 State or Province: FL

BrentB · Posted: Wed Jul 26, 2017 12:31 pm Post subject:

thanks, great pics

Does it have a drive shaft bushing? With age they become noisy

jbdba01 · Joined: 18 Nov 2014 Posts: 172 State or Province: FL

jbdba01 · Joined: 18 Nov 2014 Posts: 172 State or Province: FL

Well...finally got things together and everything checked out. I used the oil pump that I use for the gear oil to pressure check the new seals. When I pressure checked the gizmo it was leaking air all over the place - right where the metal met the plastic. I redneck engineered that with a bit of Teflon tape.

Put the plug in place to the lower unit and lo and behold she held steady at 10psi.

While undoing the lower screw I noticed more milky oil - seems I didn't flush the lower unit well enough. So after several more attempts I buttoned her up. There's a touch more in there but I'll try again next time. I tried everything to get it all out, but eventually threw in the towel and was down to just a couple drops.

Time to get her on the water...and on to the next project.

Photos follow:

Mityvac with oil pump attachment (teflon tape to mate plastic to metal - eliminates air leak)

Attached to lower unit (found out that on a Yamaha you can mate to the top "Oil Level" screw as well)

Holding steady at 10 psi

Dang...more milky stuff...flush sevral more times.

The list of doom...

BrentB · Posted: Thu Jul 27, 2017 9:42 am Post subject:

Thanks