PROJECT BACKGROUND:
PROP TESTING ACTIVITY (Boat is on dry land):
MY PROBLEMS/QUESTIONS:
Thanks in advance!
- ENGINE is Mercruiser MCM260 (350)
- STERN DRIVE is Alpha One Gen One
- I just installed a new lower shift cable - I replaced both the outer jacket and the inner cable following video instructions carefully from SEI Youtube video.
- I am 100% positive that the shift cable end is properly seated onto the roller ball inside the bell housing (and greased)
- I also installed all new bellows and cleaned the bell housing to remove crud.
- Before attaching the lower unit to the upper unit, I added the shift shaft washer (OEM Mercruiser washer) to make sure the shift boot was pushed up and staying seated in the U-shaped shift mechanism in the back of the upper unit.
- I am 100% positive that the lower unit was locked into Forward Drive while re-attaching the lower unit to the upper unit. I used bungie cords and continued to test it along the way and also when I was done.
- I am 100% positive that the L-shaped brass shift lever is seated into the U-shaped shift controller in Forward position after attaching the lower unit.
- While completing the attachment of the lower unit to the upper unit, I had to turn the prop slightly CCW to get the spline to turn and allow the lower unit to "pop" into place in the upper unit. I heard the the little "thunk" when the spline seated correctly. At this time, the prop was still LOCKED in the CCW direction.
- Inside the Engine, I have gone through the exact instructions for setting the proper shift cable adjustments 25 times using SEI videos from Youtube and also a process I found on this forum for using two people to slowly engage the prop until it locks and use that as the lower shift cable setting (plus the 6 inch measurement).
- SLOT setting for lower shift cable at engine: This is set to completely down position.
PROP TESTING ACTIVITY (Boat is on dry land):
- I can lock the drive into Forward (CCW Lock), Reverse (CW Lock), Neutral.
- When in neutral, it spins freely after coming from Reverse.
- When in neutral, it spins with a little ratcheting after coming from Forward.
- Adjusting the SLOT setting upward slightly does have an effect but I can't seem to get the exact right position.
MY PROBLEMS/QUESTIONS:
- When the Prop is locked into FORWARD (CCW LOCK), there is a lot of resistance if I try to turn it the opposite direction (CW). Should this spin freely?
- When the Prop is locked into REVERSE (CW LOCK), there is a lot of resistance if I try to turn it the opposite direction (CCW). Should this spin freely?
- Why does it ratchet when coming from Forward to Neutral, but not from Reverse to Neutral?
Thanks in advance!

