"MR" "R" drives Mercruiser...What is the difference

[codyandamber]

What is the difference between an "R" and "MR" Mercruiser outdrive?<br /><br />Thanks to all,

 

[vinney]

Re: "MR" "R" drives Mercruiser...What is the difference

R drive. Pre-load on the drive-shaft pin with spring. Mr drive Bearing on drive shaft held with retainer and tapper bearing. Bearing held with retainer is much stronger than a spring on the top of the drive shaft.

 

[codyandamber]

Re: "MR" "R" drives Mercruiser...What is the difference

I am not sure I follow you Vinney. Sometimes you have to talk to me like I am a child.<br /><br />What years did they make the "R" drive and a little more info would be great.<br /><br />thanks,

 

[Trent]

Re: "MR" "R" drives Mercruiser...What is the difference

We get short sometimes...The question has been asked alot.... Take a look at this... web page

 

[codyandamber]

Re: "MR" "R" drives Mercruiser...What is the difference

Got it. I didn't realize pre alpha was the same as an "R" and then Alpha one gen one was the same as "MR".

 

[Bondo]

Re: "MR" "R" drives Mercruiser...What is the difference

Exactly...........<br />"R", Pre-Alpha, Mod.1........<br />All Pretty Much the Same Drive.......<br /><br />"MR", Alpha 1, Alpha1 Gen.I.......<br />Same Drive.......<br /><br />Alpha1 Gen.II...........<br />A Totally Different Drive.......