650 lower unit....... water!

[Hookem Dano]

Drained the oil in my 69 650 thunderbolt, water is in the oil. I did put new oil rings on drain and vent plugs before I put the boat in. Anyway I noticed to-day the lower unit is not done up tight at the front, could see a very small gap about 5 inchs long. When you put the bottom end on should there be a gasket on there to keep the water out, or does it not matter if water gets in there. Thanks for any Info!

 

[jfholijr]

Re: 650 lower unit....... water!

Do you mean where the lower unit and the mid section come together i.e. meet? Mine did not have a gasket or seal either and I really don't think there ever was one. That is not where the water is gettin in at.

 

[Hookem Dano]

Re: 650 lower unit....... water!

Yep! thats where I mean where they come together. Must be coming through the prop seals maybe. Going to do an air test on it today and see. Thank's Whoohoo, for the return reply.

 

[2cycle]

Re: 650 lower unit....... water!

I just had my LU re-sealed off an inline 6 and it costed about $150.00 with parts and labor. I was told that the condition of the inside of the gearcase will largely determine whether or not the unit can be sealed 100% (with something that old..mine is a '74. The mechanic said the water usually gets in around the shift shaft seal. Good luck.