Merc Lower unit leak driving me bananas

[Guest]

Hey all, I am confused about this color of the oil. i mixed a little bit of water and oil and colors matched a little. I
pressure tested my LU in tub and it is holding well at 40 psi. Looks like a get a bubble every 6-8 seconds from #20 and #26 but like i said pressure is still holding. I am using Pennzoil marine gear lube. Should i use something else or is this normal??

 

[Faztbullet]

Re: Merc Lower unit leak driving me bananas

You need to pressure test it at 15psi and vaccum test it at 15psi.

 

[Guest]

Re: Merc Lower unit leak driving me bananas

You need to pressure test it at 15psi and vaccum test it at 15psi.

Does that oil look like water invaded it?

 

[GA_Boater]

Re: Merc Lower unit leak driving me bananas

Pour it in a clear container. If it has water, it will float to the bottom. Lower unit gear oil and water do not stay mixed.

 

[Guest]

Re: Merc Lower unit leak driving me bananas

Pour it in a clear container. If it has water, it will float to the bottom. Lower unit gear oil and water do not stay mixed.

i poured it into a clear ziplock and did not see any separation in liquid

 

[bruceb58]

Re: Merc Lower unit leak driving me bananas

You are pressure testing it without oil in it right?

 

[Guest]

Re: Merc Lower unit leak driving me bananas

Absolutely.

 

[Faztbullet]

Re: Merc Lower unit leak driving me bananas

If its cheap 80/90 auto oil it will areate and look like that....

 

[Guest]

Re: Merc Lower unit leak driving me bananas

If its cheap 80/90 auto oil it will areate and look like that....

I was using 80/90 pennzoil marine gear lube

 

[Guest]

Re: Merc Lower unit leak driving me bananas

went out and purchased Mercury Gear lube

 

[Mi duckdown]

Re: Merc Lower unit leak driving me bananas

weimed. Good move on the merc lube. make sure that there is NO OLD VENT/FILL gasket material stuck to the lower end Hole housing. Use a pick or small screwdriver to clean. Use New gasket/washer when you refill lower. Run for awhile and check lower end for water again. Seen this a lot with stuck washer on housing..02

 

[bruceb58]

Re: Merc Lower unit leak driving me bananas

Use New gasket/washer when you refill lower.

That's another thing.
Do you always replace the gaskets on all your drain/fill/vent plugs every oil change?

 

[Guest]

Re: Merc Lower unit leak driving me bananas

That's another thing.
Do you always replace the gaskets on all your drain/fill/vent plugs every oil change?

I installed a new impeller kit

I was advised to run it in the water for a full day then check again. Soon as i do i will report results. Thank you everyone