Lower Unit

[Dire Straits]

Not knowing that applying grease to the top of the vertical drive shaft splines could possibily cause a problem. Any advice on my next step would be greatly appreciated.

Dave

[99yam40]

all depends on what motor and problems you are talking about

[Fishinak]

What problems does it cause?
of course, I just pulled my LU and greased the heck out of my splines before reinstalling.

[TownsendsFJR1300]

Not knowing that applying grease to the top of the vertical drive shaft splines could possibily cause a problem. Any advice on my next step would be greatly appreciated.

Dave

I gather you put too much up atop the drive shaft and maybe created a hydralic lock with grease(perhaps a blob of grease on the end of the shaft?)

If so, I'd try to reach up there with a long thin stick/rod with a thin rag taped to the end and try to wipe out as much as you can. Repeat as necessary.

[99yam40]

greasing the splines keeps the shaft from rusting into the crank.

so it is good to do

What problem are you having and on what motor?

[boscoe99]

Mercury cautions against putting too much grease on the top of a driveshaft as it might prevent the driveshaft from going fully up and into the crankshaft.

Must be a close fit.

I haver never read of Yam issuing a caution note about this.

If the lower units are installed I doubt you have a problem.

[Dire Straits]

all depends on what motor and problems you are talking about

The motor is a 2002 SX200hp. Could cause incorrect tolerance of the drive shift and crankshaft. This is what I read in the SELCO Manual.

Dave

[TownsendsFJR1300]

We still don't know what the exact problem is. Please specify..

Is the LU not seating fully? If so, how far away?

Are the splines not starting, ie 4-5" space between the lower unit and mid-section?

Was this lower unit at some point on this engine or is it a replacment?


Four out of twenty questions!

[rodbolt17]

ALL outboard manufactures have issued warnings about EXCESSIVE lube on TOP of the shaft.
the crank is only drilled so deep.
to much lube between the top of the shaft and the bottom of the crank will tend to place upward pressure on the lower or thrust bearing and can cause bearing failure.

simple physics coupled with common sense.

[Dire Straits]

Thanks Rodbolt
That's exactly what I was told today from a local Yamaha dealer.

Dave