Mercruiser outdrive identification

[Pikey23]

My wife and I bought a 1984 fourwinns this year with a 3.0L 140 mercruiser, I can not identify what drive is in it though. I pulled the drive today after winterizing the boat so I could check the gimball bearing and u-joints. I have been told that it is a pre-alpha, a alpha 1 gen 1, and a MR. I really have no idea and would like to get some parts. The number stamped on the upper unit is A422131 the transom assembly serial number is A406605. Any help would be great. Thanks

 

[Bifflefan]

Re: Mercruiser outdrive identification

I have been told that it is a pre-alpha, a alpha 1 gen 1, and a MR

That is correct. They are one and the same.
There is not really and A1 gen1 per say, but if its the original one its an MR.
83 was an R and 85 is an actual alpha 1.

 

[Pikey23]

Re: Mercruiser outdrive identification

So do the MR and A1 basically use the same parts? I need u-joints and a gasket kit to remount.

 

[thumpar]

Re: Mercruiser outdrive identification

I would change the impeller also unless you know for sure it was changed in the last 2 years.

 

[Bifflefan]

Re: Mercruiser outdrive identification

Check out this link.

I just reread the history and I made a mistake. 83 and 84 are "R" drives 85 is a "MR" and 86 on is Alpha 1.
"R" meaning Redesign
"MR" meaning Mercruiser Redesign

 

[Bondo]

Re: Mercruiser outdrive identification

So do the MR and A1 basically use the same parts? I need u-joints and a gasket kit to remount.

Ayuh,... That is Correct...