Alpha 1 Gen 2 Sterndrives

[Offshore57]

Hi all....I am replacing the Alpha 1 gen 2 sterndrives on my sundancer (2 x V6 Merc)
I know the gear ratio is marked on the top unit, but is it the upper or lower unit that decides the prop rotation? I think the lower units are the same and the forward direction of rotation is created in the upper unit..is this right or am I well confused ?

Dave

UK

 

[Lazy Daze]

Shifting happens in the lower foot. Meaning, there's a gear set in the lower (inline with the prop) that moves fore and aft to engage the propshaft to determine gear selection. With a Bravo drive, it happens in the upper.

 

[Offshore57]

Hi Dennis, thanks for the reply....its more the whole counter rotation bit that I'm concerned about...

 

[Lazy Daze]

Dave, the CR is handled by having a different gear set (reverse, for lack of a better term) on the prop shaft. Meaning, the vertical driveshaft through the drive still spins the same way. But the gears on the propshaft are different on a standard drive than they are on the CR drive. So, in essence the CR thing still happens in the lower unit.

 

[Offshore57]

Dennis, thanks for the response...I was trying to save some money by getting replacement upper and lower units for the worst of the parts. Ive now bought 2 complete Alpha 1 gen 2 drives (one CR) so we should be ok now.....onwards and upwards...already got new transom shield assemblies so the whole job has cost quite a lot but it will be worth it in the spring