1977 merc 850 lower unit

[kazek]

So I end up buying 1977 merc 850 LU.there is a catch thou.drive shaft spins only clockwise,not even a movement going counterclockwise .is this normal for this year to do that?.all gears are working correctly at prop shaft.if I recall drive shaft was spinning both ways on 1975 year.any thoughts on that

 

[Laddies]

Re: 1977 merc 850 lower unit

The impeller is holding it probably hard

 

[Chris1956]

Re: 1977 merc 850 lower unit

Gee, since the motor only turns CW, why do you care? As was said, impeller doesn't want to turn that way.

 

[kazek]

Re: 1977 merc 850 lower unit

Bulls eye.thanks Laddies,after water pump disassembly and some oil shaft is good to go.i do care bout my engine,same as all the guys here.thats why this forum exis! I want to upgrade to stainless steel shaft instead of putting up with rusty and leaky steel d-shaft

 

[Moody Blue]

Re: 1977 merc 850 lower unit

i do care bout my engine,same as all the guys here.thats why this forum exis!

What Chris was saying is that the driveshaft only rotates in the CW direction, so why is it a concern if it doesn't turn CCW?

I replaced the old driveshaft on my 1971 Merc 800 a few years ago with a newer S/S type. There was so much corrosion and pitting that the seals were no longer able to seal properly. They are far and few between unless you're willing to spend $$$ for a new-old-stock.