h2o in lower unit oil Merc 7.5 1970

H

hallhen

Seaman Apprentice
Joined
May 10, 2003
Messages
30
Serial numeber 2813417<br />Also, there is oil in prop nut area and test tank.<br /><br />Can a bad oil seal cause this problem?<br />Where can i get an inexspensive pressure test tool?<br />What is the best a way to flush the lower unit with out removing the prop. barings?
 
F

Fouled Plug

Ensign
Joined
Jun 29, 2001
Messages
935
Re: h2o in lower unit oil Merc 7.5 1970

A bad seal will let water into the lower unit, causing the fluid to look like a chocolate shake. Did you try a fluid change with new vent/fill screw seals? Some unburnt oil from combustion will appear around the prop and in the water...is it LU lube for sure?
 
H

hallhen

Seaman Apprentice
Joined
May 10, 2003
Messages
30
Re: h2o in lower unit oil Merc 7.5 1970

Not sure if it is lower unit oil. <br /><br />I replaced the fill seal but the vent screw does not require a seal according to the parts list.<br /><br />The motor sat for 15 years and i am just getting it going again.
 
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