merc help/suggestions

[dohboy]

I have an old merc 1978-70hp, how hard is it to change the seals in the lower gear case, i have some very milky oil, is this something i can do or is it best to pay someone else?
at least i am assuming it is the seals any way to test this

 

[scotty]

hey there dohboy i have an older 40 hp merc 1990 and i believe i have the same problem! at least let me know???? my bottom plug was kind of looking brand new when i checked them after the motor went tits up and i was told that my seal was gone and that i would be looking at approx $1000 to tear it apart and put it back together, hoping that would be the only problem found!

vancouver, british columbia

 

[dohboy]

do you mean your spark plug? if so we are way different areas of the motor

i am talking about the seal in behind the prop, on lower end leg unit

 

[Island Fish Lifter]

You should remove the lower unit, drain the oil and pressure test it, you can make a makeshift pressure tester out of a bicycle pump. Then spray soapy water around seal areas. I expect its your shiftshaft seal as thats usually where those particular lower units leak, but dont assume, find out for sure.

Fill the dam tub!

 

[dohboy]

could i just put the air pressure in the vent or drain hole? i think i could use the hose that i fill it with and i have a small air hose to pump it with, how much pressure would u reccomend?

 

[scotty]

yeah sorry.

vancouver, british columbia

 

[Island Fish Lifter]

quote:Originally posted by dohboy

could i just put the air pressure in the vent or drain hole? i think i could use the hose that i fill it with and i have a small air hose to pump it with, how much pressure would u reccomend?

Yea, the fill/ drain hole. You shouldnt need any more that 5 to 10 psi.

Fill the dam tub!

 

[dohboy]

tks
i will try that in the afternoon, and see where i am at