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.
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.
