Merc 3.0 Alpha one shift problems after impeller replacement

XavierSPL

Seaman Apprentice
Joined
Jun 27, 2012
Messages
32
Ok, I'm only a working day or 2 from my son's bday party and I'm hoping someone can help me figure out what I goofed..
I dropped the lower and replaced the impeller prior to getting in the water for the first time this season and all seemed to be going smoothly until I tried to reattach the lower to the upper (which I left on the boat). I kept getting hung up about 1/2" from seating but was careful not to try and force it in. I couldn't for the life of me figure out why they wouldn't line up at first, I made sure the shift rod was clock wise and the prop was locked CCW, I tried turning the prop to get the splines lined up but still nothing.. I figured out the problem this morning - turned out that while I meant to put the boat in full forward - I had only put it in full throttle - it had actually been in nuetral the whole time! :facepalm:
I put the shifter at this point in forward gear at this point, the shift "foot thingy" was centered when I was able to reattach the lower to no resistance. I pumped her full of gear oil, put her in the water and took a few laps around the lake and all seemed well until I tried shifting into reverse: As soon as I tried to shift into reverse I heard a slight grind and then the engine cut out. It only took a few minutes of trying to restarting to realize the neutral safety switch was engaged preventing it from restarting. I then checked the prop to see how the shift cable adjustment was - I found that turning CW in forward was rougher than it should be - and the prop wouldn't fully lock CW in reverse. I adjusted the cable until both gears locked exactly the way they should (full CCW lock in forward, full CW lock in reverse - with an even amount for both gears when "clicked" in the opposite directions. I thought this would be a simple fix but alas - despite feeling confident that the cable has been adjusted properly I'm still getting the same "grind" in reverse. I've heard this 3 times now, never for more than a second or 2, hopefully nothing is too damaged.
Any suggestions/insights are appreciated..
 

Don S

Honorary Moderator Emeritus
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Aug 31, 2004
Messages
62,321
Re: Merc 3.0 Alpha one shift problems after impeller replacement

Most of the shift problems here are from newbies that just pulled the lower unit instead of the whole drive. There is just too many things for a 1st timer to have to deal with to do it that way. Especially since you need to pull the complete drive yearly for other maintenance.

Next bit of info is what drive you have. Is it an Alpha I or ?????? What year, or better yet, what's the serial number?
 

XavierSPL

Seaman Apprentice
Joined
Jun 27, 2012
Messages
32
Re: Merc 3.0 Alpha one shift problems after impeller replacement

Most of the shift problems here are from newbies that just pulled the lower unit instead of the whole drive. There is just too many things for a 1st timer to have to deal with to do it that way. Especially since you need to pull the complete drive yearly for other maintenance.

Next bit of info is what drive you have. Is it an Alpha I or ?????? What year, or better yet, what's the serial number?

The boat is a 1990 SeaRay 160 with a 3.0 Merc/Alpha One. I'm sure I just did something wrong here,it was shifting fine when I started this. Last spring I pulled the whole outdrive but had a hell of a time re-aligning so was hoping to change the impeller without pulling the upper. I can get the serial # tomorrow if needed.
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: Merc 3.0 Alpha one shift problems after impeller replacement

The boat is a 1990 SeaRay 160 with a 3.0 Merc/Alpha One. I'm sure I just did something wrong here,it was shifting fine when I started this. Last spring I pulled the whole outdrive but had a hell of a time re-aligning so was hoping to change the impeller without pulling the upper. I can get the serial # tomorrow if needed.

That is a perfect reason to pull the drive again and make sure things are ok. Alignment problems need to be fixed properly, or you will be pulling the engine to replace the coupler. Same with greasing the splines. That is a MUST DO.

Here are some files you might find useful. They are from the OEM manual, but it's hard to follow sometimes, so I put them in individual sections.

View attachment A1 R&R.pdf View attachment A1 Impeller replace.pdf View attachment A1 Shift Cable Adjust.pdf
 

XavierSPL

Seaman Apprentice
Joined
Jun 27, 2012
Messages
32
Re: Merc 3.0 Alpha one shift problems after impeller replacement

That is a perfect reason to pull the drive again and make sure things are ok. Alignment problems need to be fixed properly, or you will be pulling the engine to replace the coupler. Same with greasing the splines. That is a MUST DO.

View attachment 196424 View attachment 196425 View attachment 196426

Thanks for the help Don - I do not however believe there to be any alignment issues though - I should've clarifid that I had such a hard time with the alignment last spring that I gave up and took the boat to a marina and paid them to align it properly. I used it all last season after that with no issues.
I'm fairly certain that all was well until I pulled the lower this past week. I'm wondering if it's possible that I'm 1 spline off on the shift shaft maybe? The part I'm confused about is that if there was an issue with the lower shift cable, or it the cable weren't adjusted properly, then why would the prop appropriately lock as it should when I use the controls up front for forward - nuetral and reverse??
 

XavierSPL

Seaman Apprentice
Joined
Jun 27, 2012
Messages
32
Re: Merc 3.0 Alpha one shift problems after impeller replacement

I decided to remove the cable from the shift plate and try shifting into both gears while running and everything shifts smoothly, so nothing appears to be wrong with the drive - at a loss at this point, been trying to adjust the cable and despite the fact that it was working prior to my removing the outdrive, and the fact that it shift fine by hand, I can't figure out what I'm doing wrong. I did run through the instructions to adjust but even after backing the brass collar out 5-6 turns there's no change. I do still have about another 1/2" of room until the brass collar reaches the end of the cable though. Any ideas?
 

greekfreek

Petty Officer 2nd Class
Joined
Jul 5, 2010
Messages
145
Re: Merc 3.0 Alpha one shift problems after impeller replacement

Most of the shift problems here are from newbies that just pulled the lower unit instead of the whole drive. There is just too many things for a 1st timer to have to deal with to do it that way. Especially since you need to pull the complete drive yearly for other maintenance.
Why Does it need to be pulled every year??
 

dubs283

Vice Admiral
Joined
Jul 27, 2005
Messages
5,322
Re: Merc 3.0 Alpha one shift problems after impeller replacement

Why Does it need to be pulled every year??

to perform the factory recommended annual maintenance

checking/inspecting all transom assy components, inspecting coupler and checking engine alignment, greasing u-joints, coupler, and gimble bearing, etc...

its just good practice, preventative maintenance performed at winterize = smooth summerize and little to no issues when you want to use your boat come spring
 

greekfreek

Petty Officer 2nd Class
Joined
Jul 5, 2010
Messages
145
Re: Merc 3.0 Alpha one shift problems after impeller replacement

Just Merc or should I have gotten a Volvo Penta ?? A first timer will likely have issues just dropping lower unit??
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,321
Re: Merc 3.0 Alpha one shift problems after impeller replacement

Every type of drive that has a splined input shaft needs service.
 

slag

Chief Petty Officer
Joined
Jul 17, 2009
Messages
471
Re: Merc 3.0 Alpha one shift problems after impeller replacement

good info
 
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