Bravo outdrive shaft resistance

StefanFL

Member
Aug 14, 2019
56
Atlanta, GA
Boat Info
270 Sundancer 1999
Engines
7.4MPI Bravo (gen VI)
I'm in process of replacing bravo one for bravo 3.
Got bravo 3 in 'decent' condition, cleaned it, repainted...
Just pulled bravo one from the boat and when in neutral on bravo one upper shaft that goes into coupler spins pretty freely, while bravo 3 have some resistance.

Since uppers are same and when in neutral vertical shaft is not spinning, I believe they should behave the same.

Any thoughts? Which upper could be bad?

Ps. Bravo 3 is on improvised stand, and bravo 1 is laying flat in the trunk, not sure if position matters.
 
One small difference in upper b1 is 27x32
B3 is 23x30.

Basically 1.5 vs 1.65 b1 or 2.0 vs 2.2 b3.

Not sure if this could cause higher resistance as ratio is higher in my b3 upper. But difference is significant
 
You could make that diff up with a prop swap but won't know about the extra resistance till you run it to see if it's a problem drive or not
 
I have 22p props which should theoretically be mid wot range with 2.0 and top rpm wot with 2.2. I can pack either setup since I have both upper units.
My concern is that one spins pretty easy (2 fingers on yoke) while other i have to grab with whole hand and twist significantly to spin.

Either one is too loose or other is too tight:)

This is my first time pulling the outdrive so not really sure which one is ok.

The one that's tight was sitting for 2 months, so not sure if it matters. Other was pulled from a boat few hours ago.
 

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