Lower unit is out

[Bloodweiser]

Lower unit is in the bench.
Quick recap.

5psi to verify which seals are leaking.
How much vacuum after I replace the seals to verify lower unit is sealed?

 

[Ky Grady]

10 -12 psi for 3-5 minutes, if it holds, you're done.

 

[Sparkdog118]

I do 7 to 10 lbs both ways with all new seals. 5 if there are any used seals in the housing.

 

[Sparkdog118]

Spray soapy water (dawn n water)on all the seals and o rings during pressure test. If any leaks, it will bubble up.

 

[seasick]

Spray soapy water (dawn n water)on all the seals and o rings during pressure test. If any leaks, it will bubble up.

True for pressure test. For vacuum test, soap foam and/or liquid will get sucked into the seal area.

 

[Bloodweiser]

I figured on the vacuum test I will just watch the gauge for a drop

 

[seasick]

Yup.

 

[Bloodweiser]

Not seeing any bubbling, small bubbles are from my dispenser. Does it need more time on the test? I'm at 6psi

 

[Bloodweiser]

Soap showed no evidence of a leak. Unit didn't hold vacuum either. Noticed the water jacket on the midsection looked like it had some residual oil. Cleaned that. Noted oil level on motor dipstick. Check it tomorrow afternoon. Doesn't look good

 

[Ky Grady]

Did you pull vacuum or psi???

 

[Sparkdog118]

Did you check the o ring areas around the prop shaft carrier and driveshaft carrier for a pressure leak. The one around the driveshaft housing and the one around the prop shaft carrier likes to leak sometimes if there is no sealer on the o ring. I use 847 3m for all the o rings for insurance. While pressure testing and the prop shaft pointing up, spray a generous amount of soapy water into The back of the carrier behind the prop hub. Look in with a flashlight for bubbles. Also check the drain screw o rings with soap.
Also wiggle and turn the prop shaft and drive shaft while testing for bubbles. Pull driveshaft and a prop shaft in and out also.

 

[Bloodweiser]

Remember I had oil coming out of that weep hole. I did use soap around the carrier on the prop shaft. This is were I checked the prop shaft. No not inverted, but used heavy soap, no issues. Did turn drive shaft and prop shaft

 

[Bloodweiser]

This worries me, oil residue around the water jacket. Picture won't upload

 

[Bloodweiser]

This worries me, oil residue around the water jacket. Picture won't upload

 

[Bloodweiser]

Found small crack shift shaft plate.. Doesn't appear to go through.. Maybe it's a v

 

[Bloodweiser]

Drive shaft seal out. I think most of the moisture is from my testing. Some Nasty stuff packed in the lip of the seal

 

[Sparkdog118]

Make sure you clean the housing up good after you get the seals out. Put the housing in the vise. The back of this type breaker bar handle works great for getting the seals out of the housing without damage. Don’t dig any deeper than you have to
then use emery cloth to clean the salt from the aluminum housing. You can wire wheel the o ring groove if it needs it. Brake cleaner to finish the clean and you are ready to install the seal.

 

[Bloodweiser]

Thanks spark that’s what I did. Both drive and shift are done. Vacuum test was vastly improved but still leaked off, not sure if I need to apply more vacuum over time ??? Seriously contemplating the prop seals ,, should that cover that houses them pull rather easily?

 

[Sparkdog118]

It could be a project if the carrier is salted. I have a special tool for the removal of the carrier. I made a tool before I was able to get the factory one out of a flywheel puller and a set of trailer chain hooks.
left side is what the puller was and I just replaced both sides with a chain n hooks to pull the carrier.That tool and some heat will get it out.

 

[Sparkdog118]

Yamaha Outboard Parts by Year 2005 OEM Parts Diagram for Lower Casing Drive 1 | Boats.net

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#60 in the diagram has to come out.